Greenheck PLG-12 User Manual
Plug Fans
Model PLG
• Commercial and Industrial Applications
July
2010
Model PLG Plug Fan
Greenheck’s 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.
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 800°F (426°C)
• Belt or direct drive
• Horizontal or vertical mounting
PLG
Typical Applications
• Heating and air conditioning systems
• High temperature processes such as
ovens, dryers and kilns
• Spray booth evaporators and textile
dust collectors
Exploded View
Housing
Inlet Companion Flange
Inlet Collar
• Air curtains
• Custom air handlers
• Wash systems
Insulated Plug
Wheel Type
Application
Temperature
Construction
Heat Slinger
General purpose,
clean air or severe
environments
Up to 800ºF (426ºC)
Steel
Aluminum
316 Stainless Steel
Belt Guard
Backward-Inclined Wheel
Inlet Venturi
Inlet Flange (punched)
2
Shaft Guard
Construction Features
24 - PLG - CW - I - A 75
Fan Size
12 thru 49
Model PLG
Rotation
CW, CCW
Fan Class
I, II
Motor RPM
A = 1770 F = 690 M = 3600
B = 1170 J = 1425 R = 2900
C = 870 K = 950
Motor Horsepower
4 = ¼ 30 = 3 300 = 30
3 = 50 = 5 400 = 40
5 = ½ 75 = 7½ 500 = 50
7 = ¾ 100 = 10 600 = 60
10 = 1 150 = 15 750 = 75
15 = 1½ 200 = 20
20 = 2 250 = 25
3
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.
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 L
in excess of
10
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.
L
Life
10
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.
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.
Model Number Code
Fan Size
12 thru 49
Model PLG
24 - PLG - CW - I - A 75
Rotation
CW, CCW
Fan Class
I, II
Equal to
Average life
L
or
50
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 250°F (121°C) use High
Temperature Silver. Both coatings are 2-3 mils of
electrostatically-applied, baked powders that offer a
durable, long lasting finish.
Vibration Analysis – All Greenheck centrifugal products
endure a complete mechanical vibration test after
assembly. Our custom data acquisition system uses triaxial accelerometers to measure the vibration in three
planes at the design operating speed. A permanent
record for each fan’s performance is kept on file and is
available upon request.
Drive Type
Belt 0.15 in/sec-pk
Direct 0.08 in/sec-pk
Filter-In Vibration Limit
(Rigidly Mounted)
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.
Motor Horsepower
4 = ¼ 10 = 1 50 = 5 200 = 20 500 = 50
3 = 15 = 1½ 75 = 7½ 250 = 25 600 = 60
3
5 = ½ 20 = 2 100 = 10 300 = 30 750 = 75
7 = ¾ 30 = 3 150 = 15 400 = 40
Motor RPM
A = 1770 F = 690 M = 3600
B = 1170 J = 1425 R = 2900
C = 870 K = 950
3
Options and Accessories
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 200°F (93°C).
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 Greenheck’s
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.
Construction Options
Heat Fan Packages – Heat fan packages include
the enhancements required for the fan to endure
continuous high temperatures in excess of
250°F(121°C). Greenheck offers 500°F(260°C) and
800°F (426°C) packages for belt drive fans only (not
availableon direct drive).
High Temperature Construction
Operating Temperature
ºF ºC
Up to 250º Up to 121º Standard
Heat Slinger
Shaft Seal
251º - 800º 122º - 426º
Note: Aluminum construction is suitable up to 250ºF (121ºC)
High-Temperature Grease Bearings
Insulated Plug
High-Temperature AluminumPaint
Construction
Disconnect Switches – Disconnect switches are
offered in a variety of enclosures. They can be shipped
installed on the fan or loose for field installation.
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.
Spark-Resistant Construction
The fan wheel is constructed of a nonferrous material
Spark B
Spark C
(usually aluminum). A nonferrous (aluminum) rub ring
surrounds the fan shaft where it passes through the
fanhousing.
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.
4
Configurations and 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.
Typical Installation
Advantages:
• Eliminates belt and bearing maintenance
• Performance adjustments with variable
frequency drives or partial wheel widths
Available in sizes 12-36.
Plug fans can discharge to multiple
ductwork for general exhaust or
recirculation.
The optional housing directs the
discharged air to a single outlet.
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.
5
System Considerations
Fan Selection Example
Effects of Air Density
Ratings in the fan performance tables and curves
of this catalog are based on standard air (clean
and dry air with a density of 0.075 lbs/ft3 at 70°F
and a barometric pressure at sea level of 29.92 in.
of mercury). A change in elevation, temperature or
the type of gas handled will affect density. A fan
running at a constant speed and installed in a fixed
system will experience changes in pressure output
and horsepower consumption if the density of the
airstream varies. The air volume delivered by the fan
will remain constant regardless of air density.
Example of Performance Correction
Select a fan to meet the following requirements:
Volume: 10,000 cfm
Static Pressure: 1.44 in. wg
Airstream Temperature: 300°F
Installation Elevation: 10,000 ft.
Wall Thickness: 6 in.
The selection is at non-standard atmospheric
conditions and must be corrected to standard
conditions to use cataloged data.
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 300°F, 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 at
1276frpm, consuming 7.98 hp.
(Note: Cataloged Bhp does not include drive losses.
Consult AMCA Publication 203-90 for help in
estimating drive losses.)
4. The cataloged data shows a Class I design is
required at standard air, however, two maximum
frpm derates must be made: temperature and wall
thickness.
• Obtain the maximum allowable speed for 6 inch
wall thickness (Table 2).
• Since a speed of 1276 frpm is required, a
ClassI design (1193 maximum frpm) will not be
acceptable, a Class II design (1557 maximum
frpm) must be used.
• Now adjust the new maximum frpm based on the
airstream temperature (Table 3).
• Multiply the maximum frpm by the derate factor
to obtain the new maximum frpm.
1557 x 0.95 = Maximum frpm of 1480 at 300°F
Airstream Temperature Variations
When a fan is selected, two temperatures in the airstream should be considered: Start-up and normal operation.
While the horsepower required is reduced at higher temperatures, the motor must be sized based on the lowest
temperature that could be present in the airstream (when air density is at its maximum value).
1. Calculate hp at the start-up condition. Assume the
air entering the fan at start-up is 40°F (10°C). For
40°F at 10,000 ft. elevation, the air density correction
factor (Table 1.1) is 0.729. Multiply the cataloged
Bhp by the correction factor.
7.98 x 0.729 = 5.82 Bhp at start-up
2. Calculate hp during normal operation using
the same procedure, but for 300°F at 10,000 ft.
elevation.
7.98 x 0.480 = 3.83 Bhp during normal
operation
6
3. The motor should be sized based on the larger of
the two values from step 1 and 2: 5.82 Bhp.
NOTE: Considering drive losses, a 7.5 hp motor is
sufficient.
Fan Selection
Model PLG-27
Class II
RPM 1276
Motor 7.5 hp
System Considerations
Dry Air Density Correction Factor (I-P)
Multiply Standard Air Density, 0.075 lb
Altitude, (Z)
Barometric Pressure
( pb )
Temperature °F, (t)
ft. -1000 Sea Level 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
in. Hg 31.02 29.92 28.85 27.82 26.82 25.84 24.89 23.98 23.09 22.22 21.39 20.58
in. wg 421.71 406.75 392.21 378.20 364.61 351.29 338.37 326.00 313.90 302.07 290.79 279.78
-40 1.309 1.262 1.217 1.174 1.131 1.090 1.050 1.012 0.974 0.937 0.902 0.868
0 1.195 1.152 1.111 1.071 1.033 0.995 0.959 0.924 0.889 0.856 0.824 0.793
40 1.099 1.060 1.022 0.986 0.950 0.915 0.882 0.850 0.818 0.787 0.758 0.729
70 1.037 1.000 0.964 0.930 0.896 0.864 0.832 0.801 0.772 0.743 0.715 0.688
100 0.981 0.946 0.913 0.880 0.848 0.817 0.787 0.759 0.730 0.703 0.677 0.651
150 0.901 0.869 0.838 0.808 0.779 0.750 0.723 0.696 0.670 0.645 0.621 0.598
200 0.832 0.803 0.774 0.747 0.720 0.693 0.668 0.644 0.620 0.596 0.574 0.552
250 0.774 0.746 0.720 0.694 0.669 0.645 0.621 0.598 0.576 0.554 0.534 0.513
300 0.723 0.697 0.672 0.648 0.625 0.602 0.580 0.559 0.538 0.518 0.498 0.480
350 0.678 0.654 0.631 0.608 0.586 0.565 0.544 0.524 0.505 0.486 0.468 0.450
400 0.639 0.616 0.594 0.573 0.552 0.532 0.513 0.494 0.475 0.458 0.440 0.424
450 0.604 0.582 0.561 0.541 0.522 0.503 0.484 0.467 0.449 0.432 0.416 0.401
500 0.572 0.552 0.532 0.513 0.495 0.477 0.459 0.442 0.426 0.410 0.395 0.380
550 0.544 0.525 0.506 0.488 0.470 0.453 0.436 0.420 0.405 0.390 0.375 0.361
600 0.518 0.500 0.482 0.465 0.448 0.432 0.416 0.401 0.386 0.371 0.357 0.344
700 0.474 0.457 0.440 0.425 0.409 0.394 0.380 0.366 0.352 0.339 0.327 0.314
800 0.436 0.420 0.405 0.391 0.377 0.363 0.350 0.337 0.324 0.312 0.301 0.289
900 0.404 0.390 0.376 0.362 0.349 0.336 0.324 0.312 0.301 0.289 0.278 0.268
1000 0.376 0.363 0.350 0.337 0.325 0.313 0.302 0.291 0.280 0.269 0.259 0.250
TABLE 1.1: IMPERIAL UNITS DRY AIR DENSITY CORRECTION FACTOR
Dry Air Density Correction Factor (SI)
Multiply Standard Air Density, 1.2 kg/m3 by the Factor to obtain Density at Condition p
Altitude, (Z)
Barometric Pressure
( pb )
Temperature °C, (t)
TABLE 1.2: METRIC UNITS DRY AIR DENSITY CORRECTION FACTOR
4 in. (101 mm) 5 in. (127 mm) 6 in. (152 mm)
Size I II I II I II
12 3274 4270 2910 3796 2573 3354
13 2971 3875 2647 3453 2345 3057
15 2674 3488 2388 3116 2120 2764
16 2431 3171 2174 2836 1933 2521
18 2099 2738 1890 2465 1700 2217
20 1915 2498 1728 2254 1556 2029
22 1722 2246 1560 2034 1408 1836
24 1570 2048 1423 1857 1286 1678
27 1425 1859 1305 1702 1193 1557
30 1279 1668 1174 1532 1077 1404
33 1163 1517 1071 1397 984 1284
36 1051 1371 970 1266 893 1165
40 936 1221 871 1136 808 1054
44 847 1105 790 1031 735 959
49 769 1003 720 939 672 876
TABLE 2: MAXIMUM FRPM BASED ON WALL THICKNESS
Table 2 shows the maximum allowable fan speeds for plug
fans as determined by shaft length. Longer shafts used to
accommodate walls or heat plugs beyond 4 in. (101 mm)
thick require lower maximum speeds.
m -300 Sea Level 300 600 900 1200 1500 1800 2100 2400 2700 3000
mm. Hg 787.41 760.00 733.34 707.46 682.33 657.95 634.25 611.23 588.87 567.20 546.19 525.87
kPa 104.98 101.325 97.77 94.32 90.97 87.72 84.56 81.49 78.51 75.62 72.82 70.11
-20 1.200 1.158 1.117 1.078 1.040 1.003 0.966 0.931 0.897 0.864 0.832 0.801
0 1.112 1.073 1.036 0.999 0.964 0.929 0.896 0.863 0.832 0.801 0.771 0.743
20 1.036 1.000 0.965 0.931 0.898 0.866 0.835 0.804 0.775 0.746 0.719 0.692
40 0.970 0.936 0.903 0.871 0.840 0.810 0.781 0.753 0.725 0.699 0.673 0.648
60 0.912 0.880 0.849 0.819 0.790 0.762 0.734 0.708 0.682 0.657 0.632 0.609
80 0.860 0.830 0.801 0.773 0.745 0.719 0.693 0.668 0.643 0.620 0.597 0.574
100 0.814 0.786 0.758 0.731 0.705 0.680 0.656 0.632 0.609 0.586 0.565 0.544
120 0.773 0.746 0.719 0.694 0.669 0.646 0.622 0.600 0.578 0.556 0.536 0.516
140 0.735 0.710 0.685 0.660 0.637 0.614 0.592 0.571 0.550 0.530 0.510 0.491
160 0.701 0.677 0.653 0.630 0.608 0.586 0.565 0.544 0.524 0.505 0.486 0.468
180 0.670 0.647 0.624 0.602 0.581 0.560 0.540 0.520 0.501 0.483 0.465 0.448
200 0.642 0.620 0.598 0.577 0.556 0.536 0.517 0.498 0.480 0.462 0.445 0.429
220 0.616 0.594 0.574 0.553 0.534 0.515 0.496 0.478 0.461 0.444 0.427 0.411
240 0.592 0.571 0.551 0.532 0.513 0.495 0.477 0.459 0.443 0.426 0.411 0.395
260 0.570 0.550 0.531 0.512 0.494 0.476 0.459 0.442 0.426 0.410 0.395 0.380
280 0.549 0.530 0.511 0.493 0.476 0.459 0.442 0.426 0.411 0.396 0.381 0.367
300 0.530 0.511 0.494 0.476 0.459 0.443 0.427 0.411 0.396 0.382 0.368 0.354
320 0.512 0.494 0.477 0.460 0.444 0.428 0.412 0.397 0.383 0.369 0.355 0.342
340 0.495 0.478 0.461 0.445 0.429 0.414 0.399 0.385 0.370 0.357 0.344 0.331
Wall Thickness
Construction Class
/ ft3 by the Factor to obtain Density at Condition p
m
b
b
Adapted from AMCA Standard 99-09, section 0200, Charts and Tables, with written
permission from Air Movement and Control Association International, Inc.
Operating Temperature
ºF ºC
70 21 1.00
200 93 0.97
300 149 0.95
400 204 0.93
500 260 0.90
600 316 0.85
700 371 0.80
800 427 0.72
RPM Correction Factor
TABLE 3: HIGH TEMPERATURE LIMITS
Table 3 shows the rpm correction factors by which
the maximum allowable speed must be reduced.
The maximum allowable wheel rpm shown on the
fan performance pages are for fans of standard
construction operating at 70°F (21°C). The strength
of fan wheels, shafts and bearings decrease with
increasing temperature.
7
Dimensional Data
A
SQ.
B
SQ.
E
Keyway
C
F
D
4 in. (102 mm)
G
H
N - Number of equally
spaced holes
M - Dia. of holes
K
L
Bolt
O.D.
Circle
Dia.
I
J
Insulated plug
(optional)
Inlet cone mounted
separately
Imperial Specifications
Size A B C D E F G H I J K L M N
12 22.00 17.50 20.00 13.81 3.00 3.25 0.94 4.56 0.38 4.69 14.00 15.50 0.53 8
13 22.00 17.50 20.00 14.81 3.00 3.25 1.06 5.06 0.44 5.13 15.00 16.50 0.53 8
15 22.00 17.50 20.00 16.00 3.00 3.25 1.19 5.69 0.50 5.63 16.75 18.25 0.53 8
16 22.00 17.50 20.00 17.19 3.00 3.25 1.31 6.19 0.50 6.19 18.50 20.00 0.53 8
18 31.00 25.50 25.00 18.63 4.50 4.75 1.13 7.13 0.63 6.50 20.50 22.00 0.75 8
20 31.00 25.50 25.00 20.00 4.50 4.75 1.69 7.81 0.63 7.13 22.50 24.00 0.75 8
22 31.00 25.50 25.00 21.75 4.50 4.75 1.94 8.69 0.69 7.88 24.50 26.00 0.75 8
24 31.00 25.50 25.00 23.50 4.50 4.75 1.94 9.56 0.75 8.75 28.00 30.00 0.75 8
27 44.00 37.50 31.00 25.50 5.00 5.25 2.19 10.56 0.88 9.63 30.00 32.00 0.75 8
30 44.00 37.50 31.00 27.81 5.00 5.25 2.31 11.81 0.94 10.75 33.25 35.25 0.75 8
33 44.00 37.50 31.00 30.25 5.00 5.25 2.69 12.81 1.06 11.88 36.25 38.25 0.75 16
36 44.00 37.50 31.00 33.00 5.00 5.25 2.88 14.25 1.19 13.06 40.00 42.00 0.75 16
40 52.00 46.50 36.00 35.94 5.50 5.75 3.06 15.81 1.25 14.44 44.00 46.00 0.75 16
44 52.00 46.50 36.00 39.31 5.50 5.75 3.50 17.31 1.44 15.94 48.50 50.50 0.75 16
49 57.00 50.00 37.00 42.81 5.50 5.75 3.81 19.00 1.56 17.56 53.00 55.00 0.75 16
Dimensions are shown in inches.
Metric Specifications
Size A B C D E F G H I J K L M N
12 559 445 508 351 76 83 24 116 10 119 356 394 13 8
13 559 445 508 376 76 83 27 129 11 130 381 419 13 8
15 559 445 508 406 76 83 30 145 13 143 425 464 13 8
16 559 445 508 437 76 83 33 157 13 157 470 508 13 8
18 787 648 635 473 114 121 29 181 16 165 521 559 19 8
20 787 648 635 508 114 121 43 198 16 181 572 610 19 8
22 787 648 635 552 114 121 49 221 17 200 622 660 19 8
24 787 648 635 597 114 121 49 243 19 222 711 762 19 8
27 1118 953 787 648 127 133 56 268 22 244 762 813 19 8
30 1118 953 787 706 127 133 59 300 24 273 845 895 19 8
33 1118 953 787 768 127 133 68 325 27 302 921 972 19 16
36 1118 953 787 838 127 133 73 362 30 332 1016 1067 19 16
40 1321 1181 914 913 140 146 78 402 32 367 1118 1168 19 16
44 1321 1181 914 999 140 146 89 440 37 405 1232 1283 19 16
49 1448 1270 940 1087 140 146 97 483 40 446 1346 1397 19 16
Dimensions are shown in millimeters.
8
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