Acme Engineering UD18 User Manual
Direct Drive Upblast Roof Exhauster
Model UD
Model UD low silhouette direct drive upblast exhausters are
ideally suited for moving large volumes of air at low static
pressures. Capacities up to 25,130 CFM and up to 1/2 inch
static pressure. The UD is designed to discharge air up and
away from the building. Typical applications include all types of
commercial, and industrial facilities such as warehouses,
foundries, mills and manufacturing plants.
Construction Features
Windband
Constructed of heavy gauge steel with a rolled flange for extra
•
strength
Channel cross tie member provides lateral rigidity
•
Butterfly Dampers
Constructed of heavy gauge aluminum
•
Stainless steel hinge pins and nylon bearings provide quiet,
•
low friction operation
Dampers open and close against rubber bumpers for quiet
•
operation
Magnetic latches ensure positive closure and prevent damper
•
chatter
Water trough under damper hinge provides drainage for rain,
•
melting snow and ice
Aluminum Propeller
Constructed of welded heavy gauge aluminum
•
High efficiency circular arc airfoil blade design
•
Precision balanced for smooth vibration free operation
•
Housing
Heavy gauge steel base with deep drawn orifice
•
Steel structural frame carries the weight of motor, fan and
•
drive assembly on sizes 42" and 48"
Propeller Roof Fans
DIMENSIONS
Fan
Model
UD18 31.00 16.50 22.50 12.00 26.5 x 26.5 C29.5
UD21 34.00 19.00 26.25 14.25 29.5 x 29.5 C32.5
UD24 38.00 21.00 30.00 14.88 33.5 x 33.5 C36.5
UD30 46.00 26.25 37.50 16.38 41.5 x 41.5 C44.5
UD36 52.50 31.50 45.00 15.25 48 x 48 C51
UD42 60.00 36.00 52.50 19.50 55.5 x 55.5 C58.5
UD48 64.00 38.00 60.00 19.50 59.5 x 59.5 C62.5
Dimensions are shown in inches.
*Recommended maximum
ABCF
Roof
Opening*
Curb
Model
Motor
•
Continuous duty motors by nationally recognized
manufacturers
Options/Accessories
•
Roof Curbs
•
Disconnect Switches
•
Outlet Guard
•
Coatings
•
Fusible Heat Release Damper Link
•
Aluminum Windband and Housing
Acme Engineering & Manufacturing Corporation certifies
that the models shown herein are licensed to bear the
AMCA Seal. The ratings shown are based on tests and
procedures performed in accordance with AMCA
Publication 211 and AMCA Publication 311 and comply
with the requirements of the AMCA Certified Ratings
Program.
U.L. 705 Listed CSA Certified
Consult your Acme representative for availability.
Page 60
PERFORMANCE DATA
Fan
Model
HP RPM
Tip
Speed
Max.
Sones
CFM vs. Static Pressure
.000" .100" .125" .250" .375" .500"
Max.
BHP
Ship
Wts.
lbs.
UD18C6 1/8 1160 5460 14 2730 .14 111
UD18D6 1/6 1160 5460 14 3020 2560 .19 124
UD18E4 1/4 1760 8290 26 3250 3100 3050 2730 .30 111
UD18F4 1/3 1760 8290 23 3760 3540 3490 3100 .40 114
UD18G4 1/2 1760 8290 27 4290 4120 4060 3720 .59 122
UD21F6 1/3 1160 6370 19 4520 4110 3980 .37 173
UD21G4 1/2 1760 9670 28 5230 4990 4920 4580 .58 163
UD21H4 3/4 1760 9670 29 6160 5870 5800 5420 .88 161
UD21J4 1 1760 9670 31 6530 6270 6190 5810 1.04 199
UD24G6 1/2 1160 7280 20 6230 5760 5630 4880 .54 243
UD24H6 3/4 1160 7280 23 7180 6680 6530 5680 .81 266
UD24J4 1 1760 11050 37 7790 7530 7480 7100 1.13 266
UD24K4 1 1/2 1760 11050 39 9230 8890 8800 8370 1.68 271
UD24L4 2 1760 11050 39 10340 10000 9940 9500 2.26 276
UD30H8 3/4 860 6750 20 9920 9040 8820 7380 .77 375
UD30J8 1 860 6750 23 10880 9980 9740 8330 1.07 375
UD30H6 3/4 1160 9110 39 9240 8750 8620 7970 .78 365
UD30J6 1 1160 9110 29 10660 10100 9960 9200 1.04 370
UD30K6 1 1/2 1160 9110 37 13100 12390 12220 11370 1.72 375
UD30L6 2 1160 9110 38 14400 13700 13500 12610 2.24 424
UD36J8 1 860 8100 32 13980 13080 12800 11500 1.15 541
UD36K8 1 1/2 860 8100 33 16600 15650 15400 14040 1.70 548
UD36L8 2 860 8100 36 18490 17400 17130 15600 2.23 555
UD36L6 2 1160 10930 44 17000 16370 16200 15250 2.09 541
UD36M6 3 1160 10930 53 20390 19700 19530 18600 3.13 555
UD42K8 1 1/2 860 9460 35 17000 15900 15700 14200 1.72 616
UD42L8 2 860 9460 33 18600 17400 17100 15600 2.03 626
UD42M8 3 860 9460 43 23300 22100 21800 20400 3.43 636
UD48K8 1 1/2 860 10810 36 16870 15380 15040 13440 11830 10270 1.61 654
UD48L8 2 860 10810 39 19860 18610 18290 16610 14860 13080 2.02 664
UD48M8 3 860 10810 41 25130 23950 23660 22140 20520 18702 3.04 674
Propeller Roof Fans
Performance certified is for Installation Type A: Free Inlet, Free Outlet. Performance ratings do not include the effects of appurtenances (accessories).
Speed (RPM) shown is nominal. Performance is based on actual speed of test. The brake horsepower capability of an exhauster motor is dependent on the
degree of cooling the motor receives from the air moving through the motor. The above motor loadings do not overheat the motor and are in accordance with
the motor manufacturer's recommendations. It is, therefore, not detrimental to the motor and economically desirable. The sound ratings shown are loudness
values in hemispherical sones at 1.5 m (5 ft) in a hemispherical free field calculated per AMCA Standard 301. Values shown are for Installation Type A: Free
Inlet hemispherical sone levels.
For more information on this product contact your sales support.
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