roof ventilation terminals - passivent€¦ · mounted natural ventilation terminals which provide...

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CI/SfB (57) XyUniclass Ss_65_40_33_56May 2016

ROOF VENTILATION TERMINALS

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Passivent offers a range of roof-mountedterminals, primarily for natural ventilationapplications in commercial and largerresidential buildings.

Airstract terminals are also available ascombined daylighting and ventilation unitsin the form of Litevent and Sunstract (seepages 16 - 19).

Terminal sizingPassivent is able to provide sizing of roofterminal products for your application usingadvanced airflow calculation softwaredeveloped for Passivent and only available toPassivent customers.

Controls There is a range of control modules forAirstract and Airscoop terminals, rangingfrom simple switches to intelligent controlsystems incorporating carbon dioxidesensors, weather stations, and BACnetcapability.

The modulating actuators within thePassivent roof ventilation terminals arevirtually silent in operation.

Contents

Introduction 2

Design options 4

Performance 5

Airstract® terminals 6

Airstract iAT terminal 8

Aluminium Airstract terminal 9

Hybrid Plus Airstract terminal 10

Airscoop® terminals 12

Airscoop systems 14

Research 15

Litevent Airstract rooflight/ventilator 16

Sunstract rooflight/ventilator 18

Further information 20

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AIRSTRACT TERMINALS

Passivent Airstract is a range of roof-mounted natural ventilation terminalswhich combine low airflow resistance withhigh airflow capacity and excellentweatherability.

Airstract terminals can be used as part of asustainable, low-energy, natural ventilationstrategy to provide an exhaust outlet for usedair. No power is consumed as natural forcesmove the air.

Airstract applicationsUsed for passive stack ventilation (PSV)applications in conjunction with Aircool®

façade ventilators, they can ventilate deepplan spaces and provide night cooling. They can also be used for multiple extractapplications and mechanical extract outlets.

Other optionsAluminium Airstract terminals, available in a larger range of sizes.

Airstract terminals with energy efficientmechanical assistance.

AIRSCOOP TERMINALS

Passivent Airscoop is a range of roof-mounted natural ventilation terminalswhich provide top-down or displacementventilation using wind power alone.

Each unit is divided into four separate ductsinternally so that wind from any direction ischannelled down through the windwardchamber(s).

This cooler, denser air flows down into thebuilding, whilst warmer (and thereforelighter) air from inside is displaced upwardsand out via the leeward chambers.

Airscoop applicationsParticularly designed for large or deep-plancommercial buildings of up to two storeys,where direct perimeter ventilation is limitedor undesirable.

HYBRID PLUS AIRSTRACT TERMINALS

Passivent Hybrid Plus Airstract is a range of roof-mounted terminals which provide arange of additional options to the standardAirstract with an innovative air temperingand mixing unit utilising a single energy-efficient, low-power sweep fan (whenrequired).

As well as in mixing mode, in unusualbuilding occupancy events such as thegeneration of excessive CO2 levels orexcessive heat gains such as occasional highdensity occupation, the fan can also beactivated to purge the space more rapidlythan a passive ventilation system will allow.Alternatively it can still operate in passivestack mode still providing low-levelresistance to airflow.

Hybrid Plus Airstract applicationsUsed for a range of ventilation applicationsparticularly on upper floors of buildingswhere direct perimeter ventilation is limitedor undesirable. Also suitable for large openbuildings such as sports halls andauditoriums and can also be used for secureand weatherproof night cooling.


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Passivent Airstract and Airscoop terminalsare available in a variety of shapes, finishes,colours and lid options. Our in-housemanufacturing capability allows the designerflexibility to integrate terminals within aproject or to emphasise the sustainabledesign of the building.

Modern (square and rectangular)Modern terminals combine functionality andclean lines in a simple contemporary look.Alternatively they can be contrasted with arange of top designs to create a traditional orbespoke appearance. Suitable for all rooftypes from flat to 45° pitch.

Traditional (square)Traditional terminals feature a decorative topmaking them suitable for long establishedbuildings. Suitable for all roofs from flat to45° pitch.

BespokeBespoke designs are available to complementthe roof finish and accentuate the roofdesign without affecting the performance orweatherability of the terminals.

CircularCircular terminals offer a dramatic designalternative, suitable for all roofs from flat to30° roof pitch. They use standard squarebase units for ease of flashing and to ensureweather integrity.

Circular terminals feature integral winddeflection posts to maximise theiraerodynamic performance and ventilationeffectiveness.

Wind can pass around smooth cylindricalshapes relatively uninterrupted, leading to alow ventilation effectiveness. Passiventterminals have vertical airflow deflectorposts which project slightly from the louvresso as to disrupt the airflow around theterminal and cause early flow separation.This helps to increase the negative pressureon the leeward side, drawing more airthrough the louvres and thus improving theoverall ventilation performance of theterminal.

Bespoke

Modern Traditional

Bespoke - mono pitch

Circular Aluminium

Passivent design with airflow deflector postsSmooth circular design

DESIGN OPTIONS

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Performance dataData from independent testing is availableon request.

Coefficients of dischargeBased on double-bank louvres with basedampersAirstract square/rectangular 0.57Hybrid Plus Airstract 0.57Airstract circular 0.54Airscoop not applicable

Wind resistanceResistant to continuous wind loads at 51m/s,demonstrated by independent BRE tests.

AirtightnessApprox 9.7m3/hr/m2 at 50 Pa.

Fire performanceThe specially developed grade of fire-retardantABS (or the alternative aluminium) has anEXT SAA classification, independently testedto BS 476: Part 3.

Terminal and louvre type Effectiveness to BS EN ISO 13030: 2001 at given inlet velocity airflow rate

Airstract, Hybrid Plus Airstract and Airscoop terminals, incorporating patented double bank louvresClass A 100% at 0.00m/sClass A 100% at 0.50m/sClass A 99.71% at 1.00m/sClass A 99.06% at 1.50m/s

Aluminium Airstract, incorporating patented double bank louvresClass A 100% at 0.00m/sClass A 100% at 0.50m/sClass A 99.3% at 1.00m/sClass B 97.0% at 1.50m/s

Biological resistanceLouvres exclude most birds in compliancewith BRE Digest 415. 4mm insect screenbehind the louvres excludes large insects.

Acoustic performanceAir intakes sited at roof level generally allowin less noise. Acoustic treatment can be applied toAirstract and Airscoop systems to deliverplanned acoustic attenuation performance,based on independent testing by SalfordUniversity. For example:Airscoop Basic systems up to 32dB (Dn,e,w).Airscoop DAD systems up to 34dB (Dn,e,w).Airscoop RAD ducted systems up to 42dB (Dn,e,w).

Durability and sustainabilityExternal components are generallymanufactured from aluminium or fire-retardant ABS, a robust and durable materialproven in use on other exposed roofingproducts and in the automotive industry.

Airstract and Airscoop base units areproduced from marine grade plywoodsourced from managed forests.

Weather resistanceExternal louvres have been independently tested at BSRIA to BS EN 13030: 2001‘Performance testing of louvres subjected to simulated rain’.

Surface finish and coloursAll exposed ABS surfaces are treated with UV-stable polymeric resin. Aluminiumterminals are powder coated. All terminalscan be colour matched to standard BS andRAL colours used for roof coverings. Plain,metallic or textured finishes are availablethat will complement most roof finishes.


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Brickwork or blockwork ductshown built on site but galvanisedsteel extension ductwork can besupplied by Passivent

Unique patenteddouble-banklouvrearrangementincluding insectmesh combinesmaximum rainrejection withgood airflowperformance

Robust terminal with cladding andlouvres manufactured from fire-retardanthigh-impact ABS on an aluminium frame

Drain channel

Structural support andfixing point

Base unit constructed frommarine grade plywood fromrenewable forests with analuminium frame to mountAirstract terminal on; can beinsulated if required.Fixed to roof structure (steelworkor timber) for maximum rigidity,and made weathertight withflashings (by others) before theterminal is fitted

Large terminalsFor larger applications, bespoke Airstractterminals can be manufactured inaluminium (see Aluminium AirstractTerminal section). These provide evengreater airflow performance whilst stillfeaturing the patented double-bank louvresfor maximum weather protection.

BENEFITS

● Environmentally friendly energy-saving natural ventilation - no powerother than natural forces ofbuoyancy, wind and convection isrequired to move the air.

● Flexible installation: Airstractterminals are suitable for use on flatand pitched roofs covered withprofiled or standing seam sheeting,tiles or slates, and ‘green roofs’.

● Robust two-part construction ofterminal and base unit whichtogether provide a maintenance-freeand wind-load resistant design.A One Stop Solution.

● Circular terminals are mounted on asquare base to make for ease offlashing and ensure weatherintegrity.

● Motorised base dampers control theairflow, and are available withexcellent thermal performance andairtightness levels.

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Specification clause

Provide ventilation bymeans of PassiventAirstract ventilationterminals supplied byPassivent, North FrithOasts, Ashes Lane,Hadlow, Kent TN11 9QU.Telephone: 01732 850770.Fax: 01732 850949. Email:[email protected].

Airstract terminals to havebeen appraised under BS EN ISO 9001. Terminalcladding and louvresmanufactured from fire-retardant high-impactABS and connected to abase unit of marine gradeplywood from renewableforests. Resistant to windloads up to 51m/s, AAclassification to BS 476:Part 3, fitted with 4mminsect screen.

Double-bank louvres toachieve 100% rainrejection, class Aeffectiveness.

Terminal width ……mm,length ……mm,ventilation area ……mm2,roof pitch ……

Colour and texture ……to match roof covering of…… tiles/slates/sheeting*.

Multiple outlets: ……[give details]

iAT fan installed interminal .*

Motorised base damperwith internal cover grille.*

Installed by an approvedMasterCare installer.*

*Delete as applicable

Sizes

Modern and traditional design terminals (up to 45° roof pitch)

Terminal Roof opening Geometric free Equivalent free Height** Weight† sizes (mm) required (mm) area (m2) area (m2) (mm) (kg)

575 x 575* 485 x 485 0.157 0.136 818 40575 x 800 485 x 710 0.246 0.214 818 52575 x 1025 485 x 935 0.319 0.277 818 68575 x 1250 485 x 1160 0.368 0.330 818 76800 x 800* 710 x 710 0.386 0.335 1109 63800 x 1025 710 x 935 0.525 0.456 1109 79800 x 1250 710 x 1160 0.625 0.543 1109 911025 x 1025* 935 x 935 0.716 0.622 1350 951025 x 1250 935 x 1160 0.906 0.787 1350 1051250 x 1250 1160 x 1160 1.030 0.895 1391 116

Circular terminals (up to 30° roof pitch)

Diameter Roof opening†† Geometric free Equivalent free Height** Weight†(mm) required (mm) area (m2) area (m2) (mm) (kg)

1100 710 x 710 0.382 0.282 1141 871400 935 x 935 0.700 0.516 1363 1341700 1160 x 1160 1.030 0.760 1583 162

* Traditional terminals are only available in these sizes.

** Height figures are based on 0° roof pitch.

† Weight figures are based on 0° roof pitch and include the weight of the standard double-banked terminal and square base

of 1000mm in length. Weights are correct at time of going to print, but contact Passivent for current figures.

†† Circular terminals have a square roof opening.

Coefficient of discharge, see Performance section.

Note; The weights and free area do not include the optional base damper.


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ABS louvre (insect meshbehind)

Fan with grille onmounting feet

Flashing by others

Base frame

Cover grille

Passivent Aircoolcontrollable insulated dampers

DescriptionDuring peak summer temperatures, theminimal temperature difference betweenindoors and outside can result in low flowrates for passive stack ventilation, especiallyon still windless days.

During these periods or at other times ofunusual events, such as high occupancy orunusual heat gain, the building will sufferfrom raised temperatures or higher thannormal CO2 levels leading to reduced airquality and lethargy for the room occupants.

These changes in internal conditions can beidentified by the Passivent IntelligentControl System which activates the lowenergy fan. The fan generates a change ininternal pressure which maintains theventilation system performance until eitherthe temperature or CO2 levels have achieved the targeted set point.

PerformanceMaximum flow rate when inlet and outletresistances are equal and fan is in operation: 580 l/s.

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ALUMINIUM AIRSTRACT TERMINAL

DescriptionThe Aluminium Airstract is a roof mountedterminal which provides an exhaust forwarm air.

It combines high airflow capacity with lowairflow resistance and patented double-bankweather louvres.

Available in a larger size range than thestandard Airstract.

Welded aluminium lid,removable to allow access

to lifting points (cornerbraces) for craningterminals onto the

building


Provide ventilation bymeans of PassiventAluminium Airstractventilation terminalssupplied by Passivent,North Frith Oasts, Ashes Lane, Hadlow, KentTN11 9QU. Telephone: 01732 850770.Fax: 01732 850949. Email:[email protected].

Terminals to have beenappraised under BS EN ISO 9001.

Louvres to be extrudedaluminium with mitredcorners, EXT SAAclassification to BS 476:Part 3, fitted with 4mminsect screen.

Louvres double-bank toachieve 100% rainrejection, class Aeffectiveness .

Terminal width ……mm,length ……mm,ventilation area ……mm2,

Colour to match your roofcovering.

Terminal to be mountedon a structural builder'skerb by others; allnecessary flashings, secretgutters etc to be providedand installed by others.



Sizes

Terminal Geometric Equivalent Height* Builder’s kerb dimensions dimensions (mm) free area (m2) free area (m2) (mm) internal (mm) external (mm)

813 x 813 0.33 0.36 680 577 x 577 837 x 837813 x 1113 0.50 0.55 680 577 x 877 837 x 11371113 x 1113 0.76 0.85 900 877 x 877 1137 x 11371113 x 1412 1.03 1.13 900 877 x 1176 1137 x 14361412 x 1412 1.38 1.51 1208 1176 x 1176 1436 x 14361412 x 1787 1.82 2.00 1208 1176 x 1551 1436 x 18111787 x 1787 2.41 2.64 1582 1551 x 1551 1811 x 18111787 x 2012 2.75 3.02 1582 1551 x 1776 1811 x 20362012 x 2012 3.15 3.46 1740 1776 x 1776 2036 x 2036

Coefficient of discharge, see Performance section.Contact Passivent for Aluminium Airstract terminal weights.Other sizes are available on request. Please email [email protected] for more information. * Heights are based upon a flat builder’s kerb (by others).

ConstructionLouvres are extruded aluminium withmitred corners, powder coated to a standardRAL colour to match roof covering. Weldedaluminium lid. Removable lid allows accessto lifting points (corner braces) for craningterminals onto the building.

Extruded aluminiumlouvres with mitred

corners, powdercoated to a standardRAL colour to match

roof covering

Max 130mmkerb width

Structural builder'skerb (by others)

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HYBRID PLUS AIRSTRACT TERMINAL

Installation Hybrid Plus Airstract Roof Terminalcomprises two main elements: the sub-baseunit, which houses the insulated andmodulating damper, mixing chamber andfan, and the terminal which provides theweatherproof and low resistance outlet/inlet.The sub-base unit is fixed to the structure tosupport the terminal. It is supplied with thenecessary fixing brackets and can be used onflat roofs or builders’ kerbs. The louvredterminal is fixed in position over the sub-base assembly.

DimensionsTerminal: 1250 x 1250mmRoof opening required: 1160 x 1160mmHeight, standard modern terminal: 1391mmWeight: Terminal base with mixing chamber100kg. Terminal 50kg.

Specification clauseProvide ventilation bymeans of Passivent HybridPlus Airstract terminalssupplied by Passivent,North Frith Oasts,Ashes Lane, Hadlow, KentTN11 9QU.Tel: 01732 850770.Fax: 01732 850949. Email:[email protected] Hybrid PlusAirstract terminalsappraised under BS EN ISO 9001.Terminal cladding andlouvres manufacturedfrom fire-retardant high-impact ABS with integrallow energy fan andcontrollable inner shaft toenable mixing of air, nightcooling and passive

BENEFITS

● A number of different modes can beprogrammed to allow the mostenergy efficient option to be used asand when required.

● In low winter temperatures to avoiddraughts, recirculation mode mixesincoming fresh air with interiorwarm air to provide tempered freshair to the space.

● In peak summer temperatures toavoid overheating, enhanced modeallows for high levels of air movement.

● Single low-power fan uses minimalenergy only when required duringpeak summer and low wintertemperatures.

● High-level inlets in summer allowthe system to operate a night-coolingstrategy, using cooler night time airto reduce the temperature of thebuilding’s thermal mass.

● The unique terminal design does notrequire a vertical internal divider,and therefore the flow performanceis independent of wind direction.This ensures the system flowperformance does not stall withchanging wind directions.

● Controlled through an intelligentPassivent iC8000 Control System.iC8000 ensures the system operatesin the correct mode according tofactors such as CO2 concentrations,internal and external temperatures.

● Based primarily on natural ventilationstrategy so does not require largeand costly mechanical plant.

ColourBase unit: whiteclad below roof line.Ceiling cover grille:white as standard, or any standardRAL/BS colour.

ventilation, connected toa base unit of marinegrade plywood fromrenewable forests.Resistant to wind loads upto 51m/s, AA classificationto BS 476: Part 3, fittedwith 4mm insect screen.Louvres double-bank toachieve 100% rainrejection, class Aeffectiveness. Dimension1250 x 1250mm. Colour and texture … tomatch roof covering of…tiles/slates/sheeting*.Motorised base louvrewith white internal covergrille. Installed by anapproved MasterCareinstaller.


Low-energy sweep fanActuator to modulateduct position for different

ventilation modes

Base unit constructedfrom marine grade

plywood fromrenewable forests

Unique patenteddouble-bank louvre

arrangementincluding insect meshcombines maximumrain rejection with

good airflowperformance

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Mode 1 NaturalMost of the year

In natural mode the Hybrid PlusAirstract Roof Terminal acts as a passivestack. Fresh air enters the space via lowlevel air inlets, for example PassiventAircool ventilators, or opening windows.Warm air rises and is exhausted at highlevel through the Hybrid Plus AirstractRoof Terminal. This is a purely passive mode and the fan does not operate. This mode enablescontrol over indoor air quality andtemperatures.

Single-space system, 3 operating modesThe system uses one of three operating modes depending on the needs of the building and outside temperatures.

Duct actuator fully open.Air path to terminal outside ofthe duct but no mixingavailable.

Fan direction: Stopped

Sub-base damper modulating

This strategy requires a low-level inlet such as an Aircoolunit

Enhanced (air extracts)

Duct actuator fully closed.Air path to terminal outside ofthe duct fully closed.

Fan direction: Reverse

Sub-base damper open

This strategy requires a low-level inlet such as an Aircoolunit

Recirculation and enhanced(air in and air extract)

Duct actuator fully open.Air path to terminal outside ofthe duct open but no mixingavailable.

Fan direction: Forward


RecirculationDuct actuator modulatesbetween fully open and fullyclosed.Air path to terminal outside ofthe duct open. Maximummixing occurs at mid point oftravel.

Fan direction: Forward


Low-level unitsuch as Aircool

Low-level unitsuch as Aircool

Low-level unitsuch as Aircoolclosed

Tempered fresh air

Hybrid Plus AirstractRoof Terminal



Mode 3 RecirculationLow winter temperatures; summer night cooling

Low-level air inlets are closed, preventingcold draughts. Fresh air is brought in athigh level through the Hybrid PlusAirstract terminal. With the fan running,the incoming fresh air mixes withinterior warm air in the Hybrid PlusAirstract mixing chamber, providingtempered fresh air to the room. During unoccupied periods when the air inlets are closed and the temperaturerises, the Hybrid Plus Airstract terminal both supplies and exhausts air. This ensures a fresh environment whenthe room is occupied again.

The same strategy can be used for securenight cooling in summer especially ifthere are no low-level inlets or to openthem would present a security risk.

Mode 2 EnhancedPeak summer temperatures

To avoid overheating within the room,the single low power fan in the HybridPlus Airstract terminal extracts highvolumes of air from the space andexhausts it to the outside. Fresh air isbrought in through low-level air inlets.This mode allows the ventilation rateto be increased to control peaksummer temperatures.

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AIRSCOOP TERMINALS

Complete separation of chambers prevents‘short-circuiting’

Patented double-banklouvres for maximumrain rejection and optimum airflow

Structural baseunit divided into

four separatechambers, providesstructural support

to terminal anddamper housing

Unique quad arrangementof CFD-designed inlets/outlets. Provides efficientpassage of air movement atlow velocities and good airdistribution, preventing‘short-circuiting’

Patented motorisedinsulated four-wayvolume control damperswithin sub-base,controlled by singleactuator. The damperssimultaneously controlthe flow of air into andout of the unit

Modern, squareterminal design shown.Other design optionsavailable

Fixed ceiling grilles andductwork connected toinlet/outlet for RADapplication

BENEFITS

● Environmentally friendly energy-saving natural ventilation; no poweris required to move the air. Canreduce or eliminate the capital andrunning costs of ventilation or airconditioning plant.

● Range of systems: basic, enhancedDAD or enhanced RAD.

● On enhanced systems, fourautomatically controlled dampersregulate airflow according toambient conditions.

● Optimised segmented designcombined with uniquecomputational fluid dynamics (CFD)designed inlets/outlets deliversmaximum airflow capacity withminimal pressure drop through thesystem.

● Complete separation of chamberswhere they exit the Airscoop prevents'short-circuiting' of inward andoutward air flows within thebuilding.

● Unique and purpose-designedsoftware based on field testing hasbeen developed with EDSL/Tas tocalculate the ventilator sizesrequired for the application.

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Sizes

Modern and traditional design terminals (up to 45° roof pitch)

Terminal Roof opening Height** Weight† sizes (mm) required (mm) (mm) (kg)

575 x 575* 485 x 485 818 69800 x 800* 710 x 710 1109 1101025 x 1025* 935 x 935 1350 1661250 x 1250*** 1160 x 1160 1391 209

Circular terminals (up to 30° roof pitch)

Diameter Roof opening†† Height** Weight†(mm) required (mm) (mm) (kg)

1100 710 x 710 1141 1281400 935 x 935 1363 1971700*** 1160 x 1160 1583 246

* Traditional terminals are only available in these sizes.

** Height figures are based on 0° roof pitch.

*** Basic Airscoop system only in this size.

† Weight figures are based on 0° roof pitch and include the weight of the standard double-banked terminal and square base of

1000mm in length. Weights are correct at time of going to print, but contact Passivent for current figures.

†† Circular terminals have a square roof opening.

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Provide ventilation bymeans of PassiventBasic/DAD/RAD* Airscooproof-mounted ventilationterminals with automaticdamper control, suppliedby Passivent, North FrithOasts, Ashes Lane, Hadlow,Kent TN11 9QU.Telephone: 01732 850770.Fax: 01732 850949. Email:[email protected].

Terminals to have beenappraised under BS EN ISO 9001.

Terminals of high-impactABS with all exposedsurfaces treated with UV-stable polymeric resin,base of marine gradeplywood.

Weather performancetested to BS EN 13030‘Performance testing oflouvres subjected tosimulated rain’: double-bank louvres Class A 100%at 0.00m/s, Class A 100%at 0.50m/s.

Thermal insulation U-value 1.6W/m²K whenbasic dampers are closed,resistant to continuouswind loads at 51m/s, AA classification tested toBS 476: Part 3, 4mminsect screen.

Colour and texture …… toRAL / BS colour …… or tomatch roof covering.


*Delete as required


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .AIRSCOOP SYSTEMS

Enhanced Airscoop systems

Direct Air Dispersal system (DAD)Suitable for buildings with large open voidswhere there is no intermediate ceiling, suchas sports, concert and meeting halls, factoryspaces, warehouses etc. The four separate airinlets/outlets on the Enhanced Airscoopensure that the airflow is always separatedregardless of wind direction. This alsoprovides much improved distribution andmixing of air preventing 'short-circuiting' atthe unit. The patented system has beendesigned to optimise the flow characteristicswithin the Airscoop, keeping pressure lossesto a minimum.

Remote Air Dispersal (ducted) system (RAD)Suitable for all building types withintermediate ceilings such as offices andclassrooms. The system utilises the sameAirscoop design as above but theinlets/outlets are connected via flexibleductwork to four diffusers in the ceiling ofthe ventilated space. This ensures effectiveair distribution within the space and enablesthe ceiling diffusers to be sited for maximumbenefit in relation to space utilisation. Theductwork losses have been minimised,allowing runs up to 10m to be used. Sinceairflow is controlled within the Airscoop,ductwork only needs to be insulated whenrunning through cold voids.

Basic Airscoop systemsThe Basic system is suitable for use inbuildings with and without intermediateceilings. The air is ducted down from theAirscoop to controllable double skinaluminium louvres with ABS thermal breakthrough a diffuser grille mounted within theceiling or base unit for controlling airflowdirectly into the occupied space. Thedampers ensure that draughts under theoutlets are minimised, especially importantin spaces occupied during the day. The angleof the louvres also assists in spreading theairflow within the ventilated space.

Closed

0.00m/s Air Velocity 1.0m/s

Insulated volume control dampersEnhanced systems incorporate uniquepatented four-way dampers for high-efficiencyairflow either direct or remotely viaductwork.

Open

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Silsoe Research Instituteflow test laboratorymeasuring airflowperformance of Airscoops

Passivent has been a major partner in the BSRIA-chaired PiI researchproject ‘Wind Driven NaturalVentilation Systems’. The BSRIA guideBG2/2005, which is the major output of the project, confirms the principlesby which Airscoop type systems workand provides guidance on their use. It highlights the importance of keydesign parameters such as driving rain resistance and optimised flowcharacteristics following extensivewind tunnel testing and analysis ofinstalled systems in the field.

Passivent has also invested heavily in further applied research at SilsoeResearch Institute over a period ofthree years. Airscoop systems havebeen monitored both in the field and in the unique flow test laboratory. The research has also focused on theperformance of the ventilation deliveryand the distribution and mixing ofairflows. This has been linked back toCFD modelling of the flowcharacteristics both in building spacesand within the Airscoop unit itself. This has led to the development of thepatented Enhanced Airscoop systemsincorporating the unique four-waydamper device and triangular-to-roundinlets/outlets.

TAS Airscoop Builder is a new utilityfor modelling Airscoop roof-mountedventilation terminals and their benefitsto building performance. TAS is abuilding thermal analysis toolcommonly used for calculating energyconsumption and assessing peaksummer temperatures. For more information visitwww.edsl.net

Sonic anemometersmonitoring wind flow anddirection within anAirscoop

Mast monitoring windspeed and direction atHolymoorside School

Data logger/collection ofwind speed and flow andtemperature

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LITEVENT AIRSTRACT ROOFLIGHT/ VENTILATOR

The Litevent combines a controllableventilator and a rooflight, for installation onflat or low-pitched roofs. It is designed tocontribute to reduction of energy demand incommercial buildings.

AppearanceAluminium upstand and glazing frame aremill finish as standard. Frame can besupplied polyester powder coated to order.Cowl is aluminium, mill finished asstandard.Glazing is clear, diffused or bronze. Shape: dome.Internal surfaces finished in white formaximum light reflectance.


BENEFITS

CompositionAluminium upstand with insulated core,incorporating insulated ventilation doors onall four sides, controlled by linked actuators(24V modulating). Weather cowl is millfinish aluminium, and has an aluminiuminsect screen.

Rooflight has triple-skin 3mm to 4mmpolycarbonate glazing with vented air gap,in an extruded aluminium frame withmitred and secret-welded corners. Glazinghas a 10-year postformed warranty from thematerial sheet supplier against yellowingand loss of light transmission, and forimpact resistance.

Sizes

Litevent size* Daylight Ventilation geometric(mm x mm) area (m2) free area (m2)

600 x 600 0.270 0.550750 x 750 0.448 0.630900 x 900 0.672 0.6901050 x 1050 0.941 0.7701200 x 1200 1.254 0.8601200 x 900 0.918 0.770

*Roof opening size

● Combines natural ventilation andnatural daylighting functions in oneunit.

● Provides controllable ventilation withminimal energy consumption.

● Reduces the need for artificial lighting,thereby further reducing energyexpenditure.

● Thermally insulated upstand and triple-skin glazing minimise heat loss.

● Height of upstand will accommodateboth warm and cold deckconstructions without the need for anadditional timber kerb.

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PERFORMANCE DATA

Ventilation performanceMaximum ventilation area: see sizes table.Passivent can advise on the size of LiteventAirstract terminal in relation to volume ofair movement required, likely externalconditions and internal temperatures. Cd value = 0.77.

Data from independent testing is availableon request.

Impact strengthThe unit has been subjected to large, soft-bodyimpact testing by BRE and may be considerednon-fragile to HSG 33. It will resist a soft-bodyimpact of at least 1200 Joules.

Fire spread: internal and externalRatings to BS 476: Part 7: 1987 are Class 1for internal surfaces of the upstand and frame,and Class 1Y for the polycarbonate glazing.

Under Building Regulations ApprovedDocument B4 paragraph 15.7, apolycarbonate rooflight with a Class 1 ratingmay be regarded as having an AA designationfor external fire spread.

By virtue of the above performance, underApproved Document B2 Table 11 and B4Section 14, Litevent ventilators can be usedwithout restriction on size or spacing in alltypes of occupiable and circulation spaceexcept protected stairways.

Weather resistanceDriving and deluge rain resistancedemonstrated by test.

Biological resistance4mm screen in cowl excludes large nestinginsects.

Thermal insulationThe upstand and triple-skin glazing givegood thermal insulation and minimise therisk of condensation. Our TechnicalDepartment can provide computercalculations of U-values for given sizes indifferent roof constructions to comply withBuilding Regulations Part L 2013.

Light transmissionFor daylight areas see dimensions table.Average visible light transmission for 3mmglazing: clear 92%, diffused 85%, and bronze50%. G-values: clear = 0.59, diffused = 0.56and bronze = 0.43.Clear glazing allows the greatest amount ofdaylighting, making it ideal when seekingpassive solar gain. Diffused glazing diffusesthe light and cuts down shadows and brightspots. Bronze glazing provides a goodcombination of light transmission withgreater control of passive solar gain.


Provide controllableventilation combined withrooflighting by means ofLitevent Airstractventilators. Supplier: Passivent, North Frith Oasts, Ashes Lane, Hadlow. Kent TN11 9QUTelephone: 01732 850770,Fax: 01732 850949. Email:[email protected]

Ventilator to comprisemill finish aluminiumupstand with insulatedcore, aluminium cowl,vents and insect screen.Internal surfaces white.Glazing triple skin 3mmto 4mm polycarbonatewith ventilated air gap inextruded aluminiumframe with mitred andsecret-welded corners.Glazing to have 10-yearpostformed warranty fromthe material sheetsupplier against yellowingand loss of lighttransmission, and forimpact resistance.*Glazing frame polyesterpowder coated, colour .... Glazing clear/diffused/bronze*, shape:dome.Ventilator size: ...mm2

Ventilator to be resistantto soft-body impact of1200 Joules; classed asnon-fragile to HSG 33;internal fire spread ratingClass 1Y, external firespread designation AA.

*Delete as applicable.

Lining to lightwell(by others)

Insulated aluminium upstand

4mm insect screen

Ventilation door

Weather protectioncowl

Triple skin polycarbonate glazingon aluminium frame

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The Sunstract combines controllable naturalventilation with the ability to providenatural daylight, meaning the product cancontribute to the reduction of energydemand in commercial buildings.

Composition3mm to 4mm polycarbonate double or tripleskin glazing, formed with a dome or pyramidfinish. Glazing has a 10 year postformedwarranty from the sheet supplier againstyellowing and loss of light transmission, andfor impact resistance.

External weather louvres manufactured fromextruded aluminum with a 30mm pitch.

Insulated controllable louvres with 24Vmodulating actuators.

Marine grade plywood structural sub-baselined with 98% reflective material. The sub-base offers a secure roof fixing up to51m/s wind speed and is independentlytested by the BRE.

A frosted recessed diffuser suspended withinthe ceiling adaptor has an adjustable sleeveto accommodate variations in final ductlength. Suitable for use in plasterboard andsuspended ceilings.

PerformanceThe ventilation geometric free area of theSunstract system is 0.5m2 and a cd value of 0.34.

The overall calculated U-value for aSunstract terminal with double glazed top is2.06W/m2K and 1.79W/m2K with tripleglazing.


Natural daylight andventilation to … rooms tobe provided by means ofPassivent Sunstractsystem comprising:Roof-mounted unitincorporating triple /double glazed dome /pyramid* of 3.0mm clearuv-stabilisedpolycarbonate covered by10-year warranty againstloss of impact strength,excessive yellowing andloss of light transmission.Aluminium double bankweather louvres to achieve100% rain rejection to BS EN 13030:2001.Controllable insulatedlouvres on 4 sides toprovide ventilation area of0.5m2

To have AA fire rating toBS 476: Part 3: 2004.Duct sections to be 750 /500 / 250mm to be SR98Mirror with reflectance98% and 25-year warranty.System size: 885mmsquareRecessed ceiling diffuserof diffused polycarbonatewithin ventilated ceilingadaptor incorporatingadjustable sleeve.All exposed ducting withinunheated voids to bewrapped with tubeinsulation. Sunstractterminal will achieve anoverall U-value of2.06W/m2K for doubleglazed top / 1.79 W/m2Kfor triple glazed top.*Supplier: Passivent, North Frith Oasts, Ashes Lane, Hadlow. Kent TN11 9QUTelephone: 01732 850770,Fax: 01732 850949. Email:[email protected]*Delete as applicable

BENEFITS

● Combines natural ventilation andnatural daylighting functions in oneunit.

● Provides controllable ventilation withhigh lumen output.

● 885mm square ducted system forgreater structural stability and lightoutput.

● Structural sub-base provided for easeof installation and weathering into awide range of roof coverings.

● Diffused glazing reduces ‘hot spots’and spreads the light for ductingdown the system.

● Reduces the need for artificiallighting or ventilation, also reducingenergy costs.

● Thermally insulated upstand tominimise energy losses.

● Double or triple glazing to minimiseheat loss.

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Sunstract system undertest in real daylightconditions withintegrator box at base

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Internal mirrored louvres

Insulatedcontrollabledampers

Roof mounted diffusedpolycarbonate double

or triple glazing

Aluminiumexternalweatherlouvres

Light diffuser

Insulatedstructural sub base

98% reflectiveducting guidesdaylight downto the ceilingadaptor

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Insulated controllablelouvres in closed position

Terminal top cutaway

Aluminium externalweather louvres Secondary weather baffles

Looking up the Sunstract shaft with the ceiling diffuser removed.

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Ceiling adaptor(whiteinternal) withadjustablesleeve

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910056 May 2016 4635

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PASSIVENTNorth Frith Oasts, Ashes Lane, Hadlow, Kent TN11 9QU Tel: 01732 850770 Fax: 01732 850949

Email: [email protected] Web: www.passivent.com

Passivent maintains a policy of continuous development and reserves theright to amend product specifications without notice.

A division of Building Product Design Ltd. Company Registration No: 3944123

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ServicesInstallation and commissioning servicethrough an independent network ofPassivent MasterCare® installers.

Quality assurancePassivent products are designed, developedand manufactured under a BS EN ISO 9001quality management system, giving anindependently audited assurance that theproducts will fulfil their intended purpose.

Operational commitmentAs part of our commitment to minimisingour impact on the environment, and tocontinuous improvement in our methods ofoperation, Passivent is accredited to IS0 14001 Environmental Management,OHSAS 18001 Health and SafetyManagement, and to IS0 9001 QualityManagement Systems.

Other productsPassivent markets a range of other naturalventilation and daylighting products forcommercial buildings including:

Aircool ventilators for windows, curtainwalling and walls.

Framed louvres and cover grilles.

Ventilation control systems.

Natural ventilation systems for commercialbuildings.

Fresh wall ventilators.

Tricklevent window ventilators.

SoundScoop acoustic transfer ventilationproducts.

iMEV intelligent mechanical extractventilation systems.

ISO 9001 OHSAS 18001

roof ventilation terminals - passivent€¦ · mounted natural ventilation terminals which provide...

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