1826 specification for venetian blinds for windows indian standard

8/13/2019 1826 specification for venetian blinds for windows indian standard

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IS : 1826 - 1961(Reaffirmed 1996)

Edition 1.1(1969-05)

Indian Standard

SPECIFICATION FOR VENETIAN BLINDS FOR WINDOWS

(Incorporating Amendment No. 1)

UDC 69.028.33

BIS 2002

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN , 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Price Group 6


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IS : 1826 - 1961

Indian Standard


Doors, Windows and Building Furniture Sectional Committee, BDC 11

Chairman Representing

SHRI D. P. A SAR Sunderdas & Co., Bombay

Members

SHRI S. H. A BHYANKAR Central Public Works DepartmentSHRI A KSHOY B OSE Ballardie Thompson & Matthews, CalcuttaSHRI A MIYA M ADHOB C HAKI Calcutta Cabinet Makers & Furnishers Association, CalcuttaSHRI R. K. C HARI

SHRI K. S RINIVAS ( Alternate )Indian Aluminium Co. Ltd., Calcutta

SHRI M. C. G ANDHISHRI K. R. A NANTHASWAMY ( Alternate )

Man Industrial Corporation Ltd., Jaipur

GENERAL M ANAGERE NGINEER I NCHARGE , Wood Works

Department ( Alternate )

Hindustan Housing Factory Private Ltd., New Delhi

SHRI K. M. G UPTA Hind Construction Co. Ltd., CalcuttaSHRI M. J. J AL Godrej & Boyce Manufacturing Co. Private Ltd., BombaySHRI S. K. J OGLEKAR

SHRI V. M. P UNDLIK ( Alternate )Central Public Works Department

SHRI L. S. L ULLA SHRI J. N. M ULLAN ( Alternate )

Bombay State Road Transport Corporation, Bombay

SHRI C. P. M ALIK SHRI S HRI K RISHNA ( Alternate )

National Buildings Organization (Ministry of Works, Housing &Supply)

C APT N. J. M ASANI Forest Research Institute & Colleges, Dehra DunSHRI S. K. M ULLICK Hopes Metals Windows (India) Ltd., CalcuttaSHRI J. D. S HASTRI

SHRI C. D. S HARMA ( Alternate )The Indian Institute of Architects, Bombay

SHRI N. B. S HROFF Research, Design & Standards Organization (Ministry of

Railways)MR . H. T HOMSON

MR. G. W. M. W HITTLE ( Alternate )Plywood Products, Sitapur

DR . H. C. V ISVESVARAYA , Deputy Director(Bldg)

Director, ISI ( Ex-officio Member )

Secretary

SHRI D. A JITHA S IMHA Assistant Director (Bldg), ISI

BIS 2002

B U R E A U O F I N D I A N S T A N D A R D SMANAK BHAVAN , 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002


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IS : 1826 - 1961

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Indian Standard


0. F O R E W O R D

0.1 This Indian Standard was adopted by theIndian Standards Institution on 31 May 1961,after the draft finalized by the Doors, Windowsand Building Furniture Sectional Committeehad been approved by the Building DivisionCouncil.0.2 Protection against excessive daylight andglare inside buildings without restricting

ventilation is one of the problems confronting an architect. While a certain minimum area of

window space is necessary from the point of view of adequate natural ventilation during daytime, the required window space createsoften excessive glare and discomfort in theroom. Window blinds, curtains, coloured glassand similar devices have been adopted toreduce the glare and cut down excessivedaylight. This standard deals with windowblinds of the Venetian type made of either woodor metal slats.0.2.1 The components that go with a Venetianblind are of various materials and servedifferent purposes. In addition to thedescription of these components, illustrativesketches are also given in this standard. It is,therefore, to be appreciated that for the samepurpose, any other shape or design of thecomponent is permissible and the sketches asnow included are only illustrative.0.3 The Sectional Committee responsible forthe preparation of this standard has taken intoconsideration the views of producers,consumers and technologists and has related

the standard to the manufacturing and tradepractices followed in the country in this field.Due weightage has also been given to the needfor international co-ordination among standards prevailing in different countries of the world.

0.4 Wherever a reference to any IndianStandard appears in this specification, it shallbe taken as a reference to the latest version of the standard.

0.5 Metric system has been adopted in Indiaand all quantities and dimensions appearing inthis standard have been given in this system.

0.6 This edition 1.1 incorporates AmendmentNo. 1 (May 1969). Side bar indicatesmodification of the text as the result of incorporation of the amendment.

0.7 For the purpose of deciding whether aparticular requirement of this standard iscomplied with, the final value, observed orcalculated, expressing the result of a test, shallbe rounded off in accordance with IS : 2-1960

Rules for Rounding Off Numerical Values( Revised ). The number of significant placesretained in the rounded off value should be thesame as that of the specified value in thisstandard.

0.8 This standard is intended chiefly to coverthe technical provisions relating to Venetianblinds for windows, and it does not include allthe necessary provisions of a contract.

1. SCOPE1.1 This standard covers material,constructional details, sizes and requirementsof open head custom-made Venetian blindsmade of either wood or metal slats.

2. TERMINOLOGY 2.0 For the purpose of this standard, thefollowing definition shall apply.2.1 Venetian Blind A blind capable of being raised or lowered, having thin parallel slatsplaced horizontally one above the other withtwo or more heavier cross members carrying operating devices, one at the top and one at thebottom. It is equipped with a mechanical tilting

device and a cord lock which will permitsimultaneous adjustment of slats and bottom

rails at any desired angle and height, therebygiving maximum control of light and privacy

while allowing ventilation.3. GRADE

3.1 The Venetian blinds shall be of two grades,namely, Grade 1 and Grade 2; and therequirements of the two grades shall be asspecified in 3.2 and 3.3 .

3.2 Venetian blinds of Grade 1 ( see Fig. 1 )shall:

a) have aluminium slats,b) have a suitable provision either for locking

the slats to the ladders or have a dual

ladder for each slat so that the slats maynot flutter,


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c) be capable of being removedinstantaneously from their mountingswithout the need of any tools for cleaning,repairs and replacements.

3.3 Venetian blinds of Grade 2 ( see Fig. 2 )shall have wooden slats. They neither need be

removable instantaneously nor have aprovision for interlocking of the slats as inGrade 1 blinds.

4. MATERIAL4.1 Timber Timber used for the slats, toprails, tilting rails and bottom rails shall be freefrom knots and insect holes. The wooden slatsand rails shall be made from any of the timbershaving durability of Class I and II timbers asgiven in IS : 399-1952 Classification of Commercial Timbers and Their ZonalDistribution ( Tentative ).4.1.1 All timbers shall be seasoned to anaverage moisture content not exceeding 14percent except for slats in which case it shallnot exceed 10 percent.4.2 Metal4.2.1 Aluminium alloy used for rolling of slatsshall conform to NS 4 of IS : 737-1955Specification for Wrought Aluminium and

Aluminium Alloys, Sheet and Strip and shallhave the following properties:

4.2.2 All hardware including pulleys, guide

channels and other fittings, unless otherwisespecified, shall be of corrosion-resistantmaterials; if made of steel the hardware shallbe hot galvanized. All screws used for mounting hardware and installation of blinds and guidechannels shall be of brass suitablyelectroplated.

5. SIZES5.1 The size of a Venetian blind shall be definedby the width (length) and the height (drop) of the blind as ordered for the position of fixing ( see 5.2 and Fig. 3 ).5.2 The size of a Venetian blind shall dependupon the method of fixing. Venetian blinds maybe fixed in any one of the three positionsindicated in Fig. 3. Depending upon the methodof fixing, the size shall be as defined for eachposition and each individual Venetian blindshall be made to the required size of thecorresponding window or opening.5.3 Maximum Sizes of Venetian Blinds5.3.1 Venetian blinds of Grade 1 shall notexceed 500 cm in width and 10 m 2 in area.5.3.2 Venetian blinds of Grade 2 shall notexceed 275 cm in width and 7.5 m 2 in area.

6. CONSTRUCTION

6.0 Components Components of Venetianblinds shall be as specified in 6.1 to 6.13 .

6.1 Installation Brackets6.1.1 The installation brackets ( see Fig. 4A and4B ) shall be of such a design as to provide aminimum back clearance of 16 mm to the blind.They shall have a provision to hold the faciaboard in position and in a manner that would

facilitate the easy removal and refixing of thefacia boards.6.1.2 The installation brackets shall be of sufficient strength to support the weight of theentire Venetian blind and shall be so designedas to install the blind in any of the positions asspecified in 5.2 .6.2 Tilt Rail, Bottom Rail and Top Rail6.2.1 Material Tilt, bottom and top rails forboth the grades of blinds shall be made fromany of the timbers specified in 4.1 .6.2.2 Sizes

a) Tilt rails shall be 50 1 mm wide and20 1 mm thick ( see Fig. 4C ).

b) Bottom rails for blinds of Grade 1 and forblinds of Grade 2 up to a width of 250 cmshall be 50 1 mm wide and 20 1 mmthick. For blinds of Grade 2 exceeding 250 cm in width, the thickness of the railshall be increased to 25 mm ( see Fig. 4D ).

c) Top rails, wherever required, shall be62 1 mm wide and 22 1 mm thick( see Fig. 4E ).

6.2.3 The rails shall be free of twist and shallbe reasonably straight.6.3 Slats

6.3.1 Wooden slats shall be made from thetimbers specified in 4.1 . Wooden slats shall bereasonably flat and be free from twist and cupor bow in width. The slat shall be held at endson a base board of an angle of 85 to thehorizontal and the slat shall not be clear of thebase board by more than 1/500th of the width of the slat.6.3.2 Aluminium slats shall be of convex, M or

S shape and shall be made from aluminiumalloy of quality specified in 4.2.1 .6.3.3 Sizes

a) Wooden slats ( see Fig. 4F ) shall be 48

0.5 mm wide and 2.5 0.3 mm thick.b) Aluminium slats shall be 48 0.5 mmwide when formed ( see Fig. 4G ). Thethickness of coated aluminium slats shallbe 0.254 to 0.375 mm with a tolerance of 0.004 mm.

6.3.4 The number of slats per blind of differentheights (drops) shall be as shown in Table I.6.4 Route Holes6.4.1 Route holes in the slats for the passage of lifting cord shall conform to the size and shapeshown in Fig. 4H. The route holes shall beclean-cut with all edges free from burrs.

6.4.2 Route holes in top, tilt and bottom rails

Hardness ZeroUltimate tensile strength 17.3 to 22 kg/cm 2

Elongation 18 percent, Min


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shall be of sufficiently large size toaccommodate the pulley and provide for freepassage of lifting cords.

6.5 Ladder Web

6.5.1 The face and cross tapes shall be made of high grade cotton or synthetic yarn. Yarn shallbe clean and free from motes.

6.5.2 Construction The ladder web shallconsist of two vertical tapes with cross tapesplaced within them. The ends of the cross tapesshall be interwoven in the back of the face tapesto form ladders 50 mm long ( see Fig. 4J ).

6.5.3 The successive ladders shall be placed onalternate sides at 40 mm 0.5 mm centres topermit 10-mm overlap of the slats. The crosstapes shall be interwoven at a minimumdistance of 3 mm from the edge of the face tapesand shall on each side be in a straight line oneover the other ( see Fig. 4J ).

6.5.4 The ladder webs shall be so spaced in a Venetian blind as not to exceed 75 cm betweencentres. The number of ladder webs per blind of

different widths shall be as shown in Fig. 5A to 5F.6.6 Tilting Device

6.6.1 The tilting device shall be of synchronizedworm and gear design capable of lifting theblind including the slats from one extreme tothe other. It shall allow slats to be changedfrom horizontal plane to vertical plane when

tilted both frontward and backward. The tilting operation shall be smooth and positive.6.6.1.1 Where tilting device is of a type inwhich the tilting cord is locked to the tilting pulley to provide a positive pull, the minimumgear ratio shall be 7 : 1.6.6.1.2 In other cases, the tilting device shallhave a self-adjusting clutch mechanism formaintaining the level of the tilting cord, thecord having limit beads attached at its two endsto avoid its slipping beyond a given height andthe pulley carrying the tilt cord shall be sodesigned and finished that there is no unduewear on the tilt cord. The minimum gear ratioin such a type of tilter shall be 17 : 1.

TABLE I NUMBER OF SLATS PER BLIND OF DIFFERENT HEIGHTS (DROPS)

( Clause 6.3.4 )

H EIGHT(DROP )

TOTAL N O.OF S LATS

H EIGHT(D ROP )

TOTAL N O.OF S LATS

H EIGHT(DROP )

TOTAL N O.OF S LATS

H EIGHT(D ROP )

TOTAL N O.OF S LATS

(1) (2) (1) (2) (1) (2) (1) (2)

cm cm cm cm

30405060708090

100110120130140150

160170180190200210220230240250260270280290300310320330340350360

47

1012141720222427303234

373942444749515456596164666971747679818486

32.542.552.562.572.582.592.5

102.5112.5122.5132.5142.5152.5

162.5172.5182.5192.5202.5212.5222.5232.5242.5252.5262.5272.5282.5292.5302.5312.5322.5332.5342.5352.5

58

1013151720222527303235

3740424548505254575962646769727477798285

35455565758595

105115125135145155

165175185195205215225235245255265275285295305315325335345355

68

1113161821232628313335

3841434549505255586063656770727578808285

37.547.557.567.577.587.597.5

107.5117.5127.5137.5147.5157.5

167.5177.5187.5197.5207.5217.5227.5237.5247.5257.5267.5277.5287.5297.5307.5317.5327.5337.5347.5357.5

69

1214161921242629313336

3942444649515356586163666871737578808386


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6.7 Cord Lock The blind shall be providedwith automatic cord lock ( see Fig. 4K ) sodesigned that it will hold the blind at anydesired height without the need for fastening the lifting cords on hooks. The cord lock shalllock both the ends of the lifting cord

simultaneously without slippage and with asingle pull of the lifting cords. The cord lockshall be so mounted that the lifting cords can beoperated without interference and withoutundue wear and tear.6.8 Tilting and Lifting Cords6.8.1 The cords shall be made of good qualitycotton yarn or a combination of cotton andrayon or of nylon yarn.6.8.2 The cords shall be of sufficient length forconvenient and efficient use.6.8.3 Cords shall be attached in a neat andsecure manner and shall be easily detachable

and replaceable. Unless otherwise indicated,the tilting cords shall be near the end of the leftside of the blind and the lifting cords shall benear the end of the right side of the blind.6.8.4 Cords shall be No. 4, hollow or filled,uniformly braided and of smooth finish tominimize wear, stretch and abrasion. Cord No.4 shall be 3.5 0.4 mm in diameter.6.9 Cord Equalizer The lifting cord of eachblind shall be provided with a cord equalizer( see Fig. 4L ) for maintaining equal pull onboth the ends of the cord.6.10 Pulleys

6.10.1 The pulleys shall be made of a suitablematerial, that is, strong and hard and whichneeds no oiling.6.10.2 Multi-lift blinds shall have ball-bearing pulleys on the bottom rail.6.11 Centre Supports6.11.1 Tilt Rail Supports Every blind over90 cm in width shall have one tilt rail centresupport for the tilt rail; and for each additionalwidth of 75 cm, an additional centre support asshown in Fig. 5A to 5F shall be provided.6.11.2 Instal lation Su pports There shall alsobe provided installation centre sup port brackets

of a design and shape as to allow for amplesafety factor and to prevent sagging of the blind.6.11.2.1 Every blind without top rail shall beprovided with equal number of installationcentre supports of a suitable design as the tiltrail centre supports and shall be suitablyattached to the same.6.11.2.2 Every blind with top rail but 135 cmand over in width shall be provided withinstallation centre supports for everyadditional width of 90 cm suitably attached tothe top rail.6.11.2.3 The installation centre supports shallbe screwed to the back wall or the ceiling asmay be found convenient.

6.11.2.4 The installation centre supports shallbe so designed as to hold the facia board in line.6.12 Side Guide Channels Whereverspecially ordered, blinds shall be provided withside guide channels ( see Fig. 4M ). The sideguide channels shall consist of guide rails and

slat-end clips ( see Fig. 4N ) and whereverrequired, wooden battens. The guide rails shallpermit free up and down movement of the slatswithout allowing undue play of the slat-endclips. The slat-end clips shall be of nylon,stainless steel or equivalent non-rusting material and shall be of a design that will holdthe slats firmly without damaging or deforming them. The slat-end clips shall be removableeasily. One slat-end clip shall be provided foreach alternate slat at opposite ends.6.13 Facia Boards (Pelmets) Facia board( see Fig. 4P ) shall be of wood, metal or plasticof sufficient width and thickness to fit the

installation bracket, and shall be of the colourmatching the blind, unless otherwise specified.

6.14 General6.14.1 Venetian blinds shall be generallyassembled as shown in Fig. 1.6.14.2 The route holes in the top rail and/or tiltrail, slats and bottom rail shall match eachother so that they are centred correctly inrelation to each other and the width of theblind.6.14.3 The ladder webs shall be centredequidistant from the ends of the blind and fromeach other.6.14.4 The slats after assembly shall beparallel to each other in horizontal position.

7. INSTALLATION7.1 All blinds shall be secured to their properplaces with screws conforming to IS : 451-1953Specification for Wood Screws and all workshall be performed in a workmanlike manner.Installation brackets and installation centresupports shall be fixed in a workmanlikemanner. If installed on wood, 2.5 cm No. 8screws or larger size may be used. If installedon masonry, plaster, brick, cement blocks or

tile, drill a neat hole 2.5 cm deep by using aNo. 8 drill, insert a fibre or plastic plug or leadshield and use 2.5 cm No. 8 screw or larger asin wood.7.2 Nails shall not be used in the installation of brackets and centre supports.

8. FINISH8.1 Aluminium Slats The aluminium slatsshall be given a pretreatment to provide apermanent bond between the aluminium andthe finishing paint and then given suitablecoats of primer and upper coats of paint whichshall be high gloss and of a baked enamel type.8.2 Wooden Slats and Rails The wooden


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slats and rails shall be sanded smooth beforepainting. For finishing wooden slats and rails,one coat of sealer, one coat of primer-surfacer,putty and two coats of paint shall be applied.The paint used shall be semi-gloss good qualityenamel or celullose paint.

8.3 The final paint finished surface shall besmooth and even.

9. TESTING9.1 Aluminium Slats9.1.1 Physical Tests The finished aluminiumslats shall be tested for the following propertiesbefore painting:

9.1.2 Salt Water Test Aluminium slats shallbe sprayed with 5 percent salt solution at 40Cfor 500 hours and shall not show blistering,corrosion, chalking, change of colour and loss of gloss or adhesion (between metal and finish)after a recovery period of 30 minutes.9.1.3 Cold and Hot Water Test for Enamel The baked enamel finish shall resist soaking incold water for 48 hours and for 30 minutes inboiling water. The enamel shall not blister andshall recover the same hardness after being outof water for 2 hours.9.1.4 Light Test The enamel finish shallwithstand exposure to a twin-arc

weatherometer operated on a cycle of 17minutes to light without water spray and 3minutes to light with water spray, for aminimum period of 200 hours withoutblistering, corroding, chalking, loss of gloss,changing of colour, and without loss of adhesionafter a recovery period of 30 minutes.9.1.5 Rigidity Test The slats shall be of flexible aluminium having sufficient flexibilityto permit a 180 degree bend around a 7.5 cmdiameter cylinder without harm or permanentdeformation of the slats, or injury to the finishwhen released to their original shape. Bend testshall be made on both the convex and concave

sides, but shall not include the route holes. After the bend test, the slat shall be placed on aplane surface with the concave side down, andin this position the perpendicular distance fromthe supporting surface to any point on eitheredge of the slat shall not exceed 3 mm. With theslats similarly supported, the maximumdifference in the perpendicular distance fromthe supporting surface to the edge of the slatsfor any two points 75 mm apart, along eitheredge shall not exceed 1 mm. The crown of theslat shall be sufficient to support an extendedlength of at least 90 cm.

9.2 Ladder Web9.2.1 Colour Fastness and Shrinkage The

face and cross tapes of the ladder web shallhave good colour fastness to light and water,and shall not shrink more than 7 percent.Colour fastness shall be determined bystandard fadometer tests for at least 200 hours.9.2.2 Breaking Strength Face tapes of ladder

web when tested individually shall have abreaking strength of not less than 100 kg. Crosstapes (or ladders) when tested individuallyshall have minimum strength of 7 kg withoutbreaking or tearing away from the face tapes.The testing procedure shall be in accordancewith IS : 243-1951 Method of Determination of Breaking Load (Strength) and Elongation of Woven Cotton Fabrics (by constant-rate-of-traverse machine).9.3 Breaking Strength of Cords Whentested on single strand method, the breaking strength of cords shall be at least 80 kg.

10. INSPECTION AND TESTING10.1 The manufacturer shall provide allfacilities for the inspection of the blinds at hispremises.10.2 The manufacturer shall, at the request of the purchaser or his representative, give free of charge a certificate to the effect that the blindssupplied conform to the requirements of thisstandard.10.3 The purchaser shall have the option of rejecting or asking for replacement of anyarticle found to be defective or not complying with the requirements of this standard during assembly, irrespective of his prior inspectionand approval provided the defect is found tohave been in existence in the manufacturersworks and stores and not due to subsequenthandling.10.4 The purchaser shall have the right toconduct tests to determine the quality of material, construction and finish as agreed tobetween the purchaser and the manufacturer.

11. PACKING11.1 All Venetian blinds shall be supplied dulyassembled.11.2 When Venetian blinds are to bedespatched, each assembled blind shall besuitably wrapped in paper. Slats coming intocontact with hardware shall be suitablyprotected. Guide channels, when ordered, shallbe separately wrapped. The blinds shall bepacked in cases with gross weight notexceeding 55 kg.11.3 All packing shall be done in such a waythat it will not lead to damage to the finishedassembly or its components.

12. INFORMATION TO BE FURNISHEDBY THE PURCHASER12.1 The purchaser shall specify the following information to the supplier:

a) Type and class of Venetian blinds,

Tensile strength, Min 3 375 kg/cm 2

Yield stress, Min 3 100 kg/cm 2

Elongation, Max(5 cm gauge) 2.5 percent


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b) Size of Venetian blinds [width height(outside dimensions)],

c) Size of opening and position of fixing,d) Whether guide channels are required or

not, ande) Colour of slats, ladder web and cord.

13. MARKING

13.1 A ll V enetian blinds shall be m ark ed on to p

rail (or tilt rail) with a su itable mark identifyingthe m anufacturer, type and size of blind.13.2 The Venetian blinds may also be markedwith the ISI Certification Mark.

NO T E The use of the ISI Certification Mark is

governed by the provisions of the Indian StandardsInstitution (Certification M arks) Act, 1952 and the Rulesand R egulations made thereunder. D etails of conditions,under w hich a licence for the use of the ISI CertificationMark may be granted to manufacturers or processors,may be obtained from the Indian Standards Institution.

F IG . 1 V ENETIAN B LIND A SSEMBLY (Removable Type Aluminium Slats)


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F IG . 2 V ENETIAN B LIND A SSEMBLY (Fixed type Wooden slats)


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F IG . 3 M ETHODS OF F IXING V ENETIAN B LINDS


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Fig. 4A to 4FF IG . 4 T YPICAL I LLUSTRATION OF C OMPONENTS OF V ENETIAN B LINDS Contd


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F IG . 4 T YPICAL I LLUSTRATION OF C OMPONENTS OF V ENETIAN B LINDS


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1 2

F IG . 5 M ULTI -L IFT V ENETIAN B LINDS


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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act , 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments is reaffirmed when such review indicates that nochanges are needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition byreferring to the latest issue of BIS Catalogue and Standards : Monthly Additions .

This Indian Standard has been developed by Sectional Committee : BDC 11

Amendments Issued Since Publication

Amend No. Date of Issue

Amd. No. 1 May 1969

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002.Telephones: 323 01 31, 323 33 75, 323 94 02

Telegrams: Manaksanstha(Common to all offices)

Regional Offices: Telephone

Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg NEW DELHI 110002

323 76 17323 38 41

Eastern : 1/14 C. I. T. Scheme VII M, V. I. P. Road, KankurgachiKOLKATA 700054

337 84 99, 337 85 61337 86 26, 337 91 20

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832 92 95, 832 78 58832 78 91, 832 78 92

Branches : AHMEDABAD. BANG ALORE. BHOPAL. BHU BANESHWAR. COIMB ATORE.FA R I D A B A D . G H A Z I A B A D . G U WA H AT I . H Y D E R A B A D . J A I P U R . K A N P U R .LUCKNOW. NAGPUR. NALAGARH. PATNA. PUNE. RAJKOT. THIRUVANANTHAPURAM.

VISHAKHAPATNAM.

1826 specification for venetian blinds for windows indian standard

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