Plug FansModel PLG Commercial and Industrial Applications

March2013

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Model PLG Plug Fan

Model PLG (shown with insulated plug option) Volumetric flow capacity up to 70,000 cfm (118,931 m3/hr) Maximum pressures of 8 in. wg (1,984 Pa) Maximum operating temperature of 800F (426C) Belt or direct drive Horizontal or vertical mounting

PLG

Wheel Type

ApplicationGeneral purpose, clean air or severe

environments

Temperature Up to 800F (426C)

ConstructionSteel

Aluminum316 Stainless Steel

Typical Applications

Greenhecks plug fans, with backward-inclined centrifugal wheels, are designed to provide efficient and reliable operation for commercial and industrial applications. They are suitable for supply, exhaust, or recirculation systems.

In most instances, plug fans are unhoused and rely on the plenum space around the wheel to direct airflow as required in the system. This style of fan is designed with the motor, bearings, and drives out of the airstream, which allows for use in clean, contaminated, or high temperature systems.

Inlet Companion Flange

Inlet Flange (punched)

Inlet Collar

Inlet Venturi

Housing

Backward-Inclined Wheel

Insulated Plug Heat Slinger

Shaft Guard

Belt Guard

Exploded View

Heating and air conditioning systems High temperature processes such as

ovens, dryers and kilns Spray booth evaporators and textile

dust collectors

Air curtains Custom air handlers Wash systems

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Construction Features

Wheels Backward-inclined single-width with non-overloading performance. Standard construction includes heavy-gauge steel wheel cone and backplate with welded steel blades. Wheels are statically and dynamically balanced to grade G6.3 per ANSI S2.19. Available in aluminum or stainless steel.

Mounting Frames Heavy-gauge steel with die-formed flanges and welded corners. Rigid steel gussets are welded to the frame and motor supports to ensure precise drive alignment. Panel is prepunched for ease of installation. Motor mounting plates on belt drive models are adjustable to maintain proper belt tension. Available in stainless steel construction.

Inlet Cones Inlet cones are heavy-gauge spun steel. They include prepunched mounting holes for field installation. Available in aluminum or stainless steel.

Fan Shafts Turned and polished steel that is sized so the first critical speed is at least 25% over the maximum operating speed for each pressure class. Available in stainless steel.

Coatings All steel components are coated with Permatector. Fans used for high temperature applications above 250F (121C) use High Temperature Silver. Both coatings are 2-3 mils of electrostatically-applied, baked powders that offer a durable, long lasting finish.

Premium Bearings Model PLG plug fans are manufactured with Air Handling Quality self-aligning ball or roller pillow block bearings. Our standard bearings use concentric lock collars (no set screws) which ensure smooth operation and provide superior grip-force between the bearing collar and fan shaft. These bearings are selected for a basic rating fatigue life of L10 in excess of 80,000 hours. For more critical applications, Greenheck offers bearings with a minimum L10 life in excess of 200,000 hours. Our bearings include zerk fittings for relubrication.

L10 life implies 90% reliability or 10% failure rate after the stated hours. L50 life implies 50% reliability or 50% failure rate after the stated hours.

L10 LifeEqual to L50 or

Average life

Industry Standard 40,000 hrs. 200,000 hrs.

Greenheck Standard 80,000 hrs. 400,000 hrs.

Greenheck Upgrade 200,000 hrs. 1,000,000 hrs.

Vibration Analysis All Greenheck centrifugal products endure a complete mechanical vibration test after assembly. Our custom data acquisition system uses tri-axial accelerometers to measure the vibration in three planes at the design operating speed. A permanent record for each fans performance is kept on file and is available upon request.

The standard filter-in vibration levels attained meet the requirements of Fan Application BV-3 as defined in ANSI/AMCA Standard 204-05 Balance Quality and Vibration Levels for Fans. Consult the factory if more stringent vibration levels are necessary.

Drive Type Filter-In Vibration Limit(Rigidly Mounted)

Belt 0.15 in/sec-pk

Direct 0.08 in/sec-pk

24 - PLG - CW - I - A 75

Fan Size12 thru 49

Model PLG

RotationCW, CCW

Fan ClassI, II

Motor RPMA = 1770 F = 690 M = 3600B = 1170 J = 1425 R = 2900C = 870 K = 950

Motor Horsepower 4 = 10 = 1 50 = 5 200 = 20 500 = 50 3 = 15 = 1 75 = 7 250 = 25 600 = 60 5 = 20 = 2 100 = 10 300 = 30 750 = 75 7 = 30 = 3 150 = 15 400 = 40

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Model Number Code

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Shaft and Belt Guards Shaft and belt guards are built to OSHA guidelines to provide personnel protection from the rotation of the shaft, belts, and pulleys.

Inlet Vane Dampers Inlet vane dampers are available to provide airflow control. Nested inlet vanes are integral with the inlet cone. External inlet vanes bolt to the flange of the inlet cone. The maximum temperature capacity for inlet vanes is 200F (93C).

Heat Slinger A shaft mounted cooling device which is placed between the inboard bearing and the drive panel to dissipate heat conducted along the fan shaft. Heat slingers are included with any heat fan package.

Insulated Plugs Insulated plugs provide a thermal barrier between the airstream and the motor compartment. This insulated section is available in 4inch (101 mm), 5 inch (127 mm), and 6 inch (152 mm) thicknesses. Insulated plugs are included with any heat fan package (not available on direct drive).

Centrifugal Fan Housings Housings offer a connection to ductwork and can be used to direct the airflow. The housing is designed for mounting to the plenum wall and can be used for any rotation or discharge position (no flanges or support frames are supplied).

Shaft Seals Shaft seals reduce air leakage caused by the shaft penetration in the fan panel. Shaft seals are available in felt or neoprene.

Extended Shafts Extended shaft lengths accommodate wall thickness of 5 inches (127 mm) and 6 inches (152 mm).

Specialized Powder Coatings Specialized powder coatings are available for elevated temperatures and highly corrosive applications. Consult Greenhecks Product Application Guide, Performance Coatings for Ventilation Products. For a complete listing of coatings, visit www.greenheck.com.

Inlet Modifications Inlet collars, inlet flanges, and companion flanges are available for ducted inletapplications.

Disconnect Switches Disconnect switches are offered in a variety of enclosures. They can be shipped installed on the fan or loose for field installation.

Options and Accessories

Spark-Resistant Construction

Spark B

The fan wheel is constructed of a nonferrous material (usually aluminum). A nonferrous (aluminum) rub ring surrounds the fan shaft where it passes through the fanhousing.

Spark C

The inlet cone is constructed of nonferrous material (usually aluminum). A nonferrous (aluminum) rub ring surrounds the fan shaft where it passes through the fanhousing.

Heat Fan Packages Heat fan packages include the enhancements required for the fan to endure continuous high temperatures in excess of 250F(121C). Greenheck offers 500F(260C) and 800F (426C) packages for belt drive fans only (not availableon direct drive).

Spark-Resistant Construction Greenheck plug fans are available with spark-resistant designs suitable for applications that involve flammable particles, fumes or vapors. Spark-resistant construction options adhere to guidelines defined within AMCA Standard 99-0401-86.

High Temperature Construction

Operating TemperatureConstruction

F C

Up to 250 Up to 121 Standard

251 - 800 122 - 426

Heat SlingerShaft SealHigh-Temperature Grease BearingsInsulated PlugHigh-Temperature AluminumPaint

Note: Aluminum construction is suitable up to 250F (121C)

Construction Options

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Configurations and Installation

Insulated plug design is shown. Maximum wall thickness for a standard length shaft is 4 in. (101mm). Optional 5 in.(127mm) or 6 in. (152 mm) shaft lengths are available for a thicker wall.

Plug fans can discharge to multiple ductwork for general exhaust or recirculation.

The optional housing directs the discharged air to a single outlet.

Typical Installation

Available Configurations

Belt Drive Arrangement 9 Direct Drive Arrangement 4

Advantages:

Performance adjustments with variable frequency drives or with pulley adjustments

Higher temperature capabilities

Accomodates wall thickness of 4 inches with standard shaft

Available in sizes 12-49.

Advantages:

Eliminates belt and bearing maintenance

Performance adjustments with variable frequency drives or partial wheel widths

Available in sizes 12-36.

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1. Air volume remains at 10,000 cfm since the volume delivered is not affected by air density.

2. An air density correction factor must be applied to the static pressure. For an elevation of 10,000 ft. and a temperature of 300F, 0.480 is the required correction factor (Table 1.1). Use the correction factor to adjust the static pressure by dividing the required static pressure by the correction factor. 1.44 in. wg 0.480 = 3.0 in. wg

3. Now select a fan size from the cataloged data based on the corrected performance at standard air (10,000 cfm at 3.0 in. wg). The PLG-27 fan will deliver 10,050 cfm at 3.0 in. wg running