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TABLE OF CONTENTS
Page
Construction Features ---------------------------------------------------------3
High Temperature and Smoke Exhaust Application -------------------------------------4
Performance Data ------------------------------------------------------------5
Dimensional Data-------------------------------------------------------------6
Typical Specifications ----------------------------------------------------------6
Optional Accessories ----------------------------------------------------------7
Optional Coatings-------------------------------------------------------------7
Warranty Statement -----------------------------------------------------------8
MODEL UBH Tube Axial Belt Drive Upblast Roof Exhauster
The rugged design of the UBH is best suited
for commercial roof exhaust applications
where conditions require the motor, drives,
and bearings to be out of the airstream. The
high velocity upblast discharge of the UBH
disperses air high above the building’s roof.
The UBH mounts directly over the roof
opening for efficient exhaust from ducts or
open areas. Models are available in 9 sizes
ranging from 16 to 60 inches with a CFM
range of 1757 to 61,236 and static pressures
up to
inch. UBH exhausters are capable to
handle temperatures up to 200°F.
Acme Engineering & Manufacturing Corp. certifies that Upblast Roof Exhauster Models UBH, UBH-UF and
UBH-SE shown on page 5 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.
Most Acme JETMASTER™ fans
bear the U.L. listing mark.
Consult the Acme representative
for availability.
Page 2
Most Acme JETMASTER™ fans are
listed by the Canadian Standards
Association Testing Laboratory as
approved. Consult the Acme
representative for availability.
Page 3
CONSTRUCTION FEATURES
WINDBAND
Windbands are made of heavy gauge steel with
a flange at the top to provide extra strength and
protection from driving crosswinds. A channel
type cross tie member provides additional lateral
rigidity for the windband and serves as an open
position stop for butterfly dampers.
BUTTERFLY DAMPERS
Butterfly dampers
automatically swing
up to full open
position to permit free
passage of exhaust
air and fumes. They
automatically close
when the fan is turned
off. Constructed of
heavy gauge
aluminum and
reinforced with two full
length hinge brackets
for extra durability.
DRIVES
All drives use heavy-duty type neoprene spark
proof, oil, and heat resistant V-Belts. Drives are
1 or 2 belt combinations depending on
horsepower. Motor and fan sheaves are cast
iron.
BEARINGS
Pre-lubricated bearings
are used in a duplex
split pillow block
bearing housing. The
bearings remain in
perfect alignment after
shipment, installation,
and subsequent
operation. Bearings are resiliently mounted in
neoprene rings, providing extra protection and
vibration isolation. The bearing assembly is
rated at an L-50 life of 200,000 hours. Acme
provides a 5 Year Limited Warranty on duplex
split pillow block bearings and shaft. Unitary
pillow block bearings are used on UBH60,
UBH-UF and UBH-SE models.
STAINLESS HINGE PINS
Positive damper action is insured by stainless
steel hinge pins in nylon bearings for quieter, low
friction operation. No lubrication required.
MAGNETIC LATCHES/DRAINAGE TROUGH
Weather protection is provided by magnetic
latches that hold dampers closed when the
exhauster is not in use. A water trough is
positioned under the butterfly damper hinge to
provide drainage for rain, melting ice, and snow.
RUBBER BUMPERS
Dampers open and close against rubber
bumpers for quieter operation.
PROPELLERS
Propellers utilize the high efficiency circular arc
airfoil blade design. Constructed of all welded
heavy gauge aluminum (except UBH54, UBH-UF
and UBH-SE Models, which are steel). All other
sizes available with steel construction. Precision
balanced.
HOUSING
Standard construction of windband, curb-base,
housing and frame is of heavy gauge steel with
an epoxy finish.
MOTOR WEATHER COVER
Motor weather covers protect motor and drive
from adverse weather conditions.
STREAMLINED BELT & BEARING
ENCLOSURE
Full streamline virtually
eliminates the turbulence and
air drag produced by
conventional belt enclosures.
Bearings are ventilated with
outside air for cooler operation.
Maximum recommended
temperature of UBH model not
to exceed 200°F.
EPOXY FINISH
A tough baked-on acrylic epoxy is the standard
finish inside and out for all steel parts. Access
door, motor cover, aluminum prop, and butterfly
dampers are not coated. Attractive in
appearance, it is a multi-purpose finish that
provides exceptional resistance to attack by
many chemicals and corrosive agents. Metal
surfaces are prepared prior to painting by an iron
phosphate process for superior rust protection
and bonding of the paint to the base metal.
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HIGH TEMPERATURE AND SMOKE EXHAUST APPLICATIONS
UBH Upblast Exhausters are available with special construction features that meet or exceed the
requirements for emergency high temperature exhaust and smoke removal applications.
Models UBH-UF and UBH-SE
The UBH-UF and UBH-SE Upblast Exhausters are specially designed and constructed to remove high
temperature exhaust and smoke. These specially equipped exhausters meet IRI (Industrial Risk Insurers)
requirements for exhausting 500°F air for 4 hours and SBCCI’s “Standard Fire Prevention Code”
requirements for exhausting 1000°F air for 15 minutes in emergency situations.
The UBH-SE Butterfly Damper meets the requirements of UL793 for snow loading.
NOTE: While Models UBH-UF and UBH-SE are constructed to operate in temperature and time limits
stated above, some parts of the fan may be destroyed when exposed to unusually high temperatures for
prolonged periods.
Construction
Features
Hi-Temperature Bearings ••
Copper Lubrication Lines ••
Dual Heat Resistant Belts ••
Heat Slinger ••
Steel Propeller ••
Motor Outside Airstream ••
Ventilated Belt and Bearing
Enclosure
Fusible Link Damper Lifters ••
Fusible Link Damper Lifters capable of lifting 10 lbs/sq. ft.,
meets UL 793
UL Listed “Power Ventilator for
Smoke Control Systems"
Model
UBH-UF
Model
UBH-SE
••
•
•
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UBH, UBH-UF and UBH-SE PERFORMANCE DATA
FAN
SIZE
16”
MODEL
No.
UBH16E
UBH16F1/
UBH16G1/
UBH16H3/
TIP
HP RPM
1
/
4
3
2
4
SPEED
1800 7568 24 2273 2070 1794 .27 124
1976 8308 28 2495 2310 2081 1757 .36 130
2267 9532 32 2862 2702 2530 2304 2000 .54 132
2600 10931 42 3283 3142 3002 2829 2631 2365 2064 .81 134
MAX
SONES
.000 .125 .250 .375 .500 .625 .750 1.000 1.250
CFM VS. STATIC PRESSURE
UBH16J 1 2855 12004 48 3604 3477 3349 3217 3038 2854 2604 2074 1.08 138
1
/
1510 7214 23 3118 2862 2552 .37 140
3
1730 8266 27 3573 3349 3103 2795 .54 144
2
1980 9460 34 4089 3893 3697 3456 3171 2670 .81 148
4
18”
UBH18F
UBH18G1/
UBH18H3/
UBH18J 1 2180 10416 38 4502 4324 4146 3950 3722 3437 2995 1.09 152
UBH18K 11/22495 11921 47 5153 4997 4842 4686 4506 4308 4105 3316 2605 1.63 156
1
/
UBH24G
UBH24H3/
UBH24J 1 1375 8770 36 6923 6521 6072 5549 4780 1.00 379
24”
UBH24K 11/21600 10200 45 8056 7711 7365 6939 6496 5866 4875 1.53 388
1090 6950 19.2 5488 4976 4292 0.50 367
2
1250 7980 28 6294 5852 5327 4624 0.75 372
4
UBH24L 2 1730 11040 53 8711 8391 8072 7706 7306 6835 6252 4633 2.00 399
UBH24M 3 1945 12400 64 9793 9509 9225 8941 8589 8233 7850 6765 2.83 410
UBH30H
3
/
856 6830 21 8820 8300 .75 568
4
UBH30J 1 942 7520 27 9740 9260 8360 1.00 574
UBH30K 11/21078 8600 38 11110 10400 9750 8850 7650 1.50 583
30”
UBH30L 2 1187 9480 45 12130 11580 10920 10160 9340 7920 1.95 596
UBH30M 3 1358 10850 53 14000 13610 13040 12410 11720 11030 10080 3.00 607
UBH30N 5 1644 13140 71 16946 16519 16085 15639 15171 14671 14129 12842 5.30 615
UBH36J 1 698 6670 27 12500 11230 1.07 805
UBH36K 11/2799 7640 31 14310 13230 11840 1.60 812
36”
UBH36L 2 880 8410 37 15770 14850 13600 12080 2.14 823
UBH36M 3 1007 9620 61 18040 17230 16200 15090 13660 11990 3.20 832
UBH36N 5 1193 11400 71 21380 20700 19950 19100 18160 16940 15810 12230 5.33 840
1
UBH42K 1
/2620 6900 28 18330 16870 15160 1.73 1046
UBH42L 2 683 7600 32 20190 18900 17510 15750 2.30 1049
UBH42M 3 781 8690 47 23070 21960 20740 19300 17710 14760 3.43 1058
42”
UBH42N 5 926 10300 54 27860 26390 25450 24420 23230 21950 20580 5.73 1073
UBH42P 71/21060 11800 77 31400 30580 29740 28910 28030 26500 25870 23320 8.66 1148
UBH42R 10 1170 13025 95 34584 33779 32974 32169 31364 30463 29546 27651 10.91 1178
1
UBH48K 1
/2498 6320 30 22115 20400 1.48 1366
UBH48L 2 548 6960 36 24330 22830 20570 1.96 1375
UBH48M 3 627 7960 55 27840 26500 24930 22660 19390 2.94 1384
48”
UBH48N 5 743 9430 68 33000 31930 30740 29240 27300 24770 21780 4.90 1394
UBH48P 71/2851 10800 78 37770 36890 35870 34670 33310 31770 29720 24600 7.36 1475
UBH48R 10 936 11900 92 41580 40800 39860 38730 37790 36470 34970 31400 9.80 1506
UBH54K 1
1
/2416 5881 21 23074 20424 17140 1.71 1566
UBH54L 2 458 6475 25 25403 23014 20325 16254 2.30 1575
UBH54M 3 524 7408 30 29064 26989 24793 22144 18038 3.41 1584
54”
UBH54N 5 621 8779 40 34444 32700 30910 29003 26788 23991 5.76 1594
UBH54P 71/2711 10052 53 39436 37916 36373 34780 33088 31186 28907 8.56 1676
UBH54R 10 783 11069 61 43430 42050 40657 39234 37761 36198 34463 30122 11.55 1706
UBH54S 15 870 12299 73 48255 47014 45765 44500 43207 41873 40472 37262 33186 15.85 1766
UBH60M 3 432 6786 28 32579 29779 26713 22539 3.24 1952
UBH60N 5 510 8011 36 38416 36104 33652 30906 27359 5.31 2072
UBH60P 71/2590 9268 45 44494 42462 40387 38210 35793 32848 8.15 2175
60”
UBH60R 10 640 10053 54 48265 46393 44494 42532 40447 38096 35275 10.43 2218
UBH60S 15 750 11781 69 56560 54965 53358 51724 50047 48300 46432 41960 35497 16.73 2395
UBH60T 20 812 12755 82 61236 59763 58282 56784 55258 53691 52061 48432 43912 21.39 2455
MAX
BHP*
SHIP
WTS.
LBS.
Performance shown is for Installation Type A: Free Inlet, Free Outlet.
Performance ratings do not include the effects of appurtenances in the airstream.
*Power rating (BHP) does not include drive losses.
The sound ratings shown are loudness values in fan sones at 5 feet (1.5 m) in a hemispherical free field calculated per AMCA Standard 301.
Values shown are for installation Type A: Free Inlet fan sone levels.
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DIMENSIONAL DATA
AIRFLOW
TYPICAL SPECIFICATIONS
Roof exhaust fan shall be propeller belt drive
tubeaxial type.
The precision balanced propeller shall be all
aluminum with die-formed circular-arc airfoil blades
attached to a special die-formed spherical hub for
high airflow capacity.
FAN
SIZES
All dimensions shown in inches
AB C E
16" 27 34 221/2141/
18" 31 35 241/2151/
24" 38 403/430 20 C36.5
30" 46 541/4371/225 C44.5
36" 521/2647/845 307/
42" 60 673/8521/2323/
48" 64 743/460 371/
54" 67 847/8671/2411/
60" 75 943/875 461/
2
2
8
8
4
4
2
CURB
MODEL
C25.5
C29.5
C51
C58.5
C62.5
C65.5
C73.5
Typical drawing for dimensional purposes only,
which is correct within limits suitable for normal
installation requirements, and does not
necessarily show actual construction.
Pre-lubricated ball bearings shall be mounted in a
duplex split pillow block housing for accurate
alignment and are rated at a L-50 life of 200,000
hours. Bearings shall be resiliently mounted in
neoprene rings providing protection and vibration
isolation. Model UBH60 shall be with unitary pillow
block bearings.
The fan housing shall consist of a windband, curb
base/orifice assembly, motor weather cover and
tube with full streamline belt and bearing enclosure
to increase efficiency. The windband shall have a
rolled flange for strength and have an integral
channel cross member with rubber bumpers for
damper stops and lifting brackets. The deep drawn
orifice shall be die-formed. Butterfly damper should
include a rubber bumper strip for quiet opening and
closing. Heavy duty structural steel brackets shall
transmit the weight of the motor, propeller, butterfly
dampers and tube directly to the curb base/curb to
prevent orifice distortion. The tube shall have an
access door (except sizes 16-36) for internal
inspection and an integral rolled flange for structural
rigidity and to eliminate leakage at the flange
connection.
Butterfly dampers shall be constructed of aluminum
and have stainless steel hingepins which rotate
freely in nylon bearings requiring no lubrication. An
internal double outlet drainage trough and magnetic
latches give greater weather protection.
Drives shall be cast iron pulleys with static
conducting, oil and heat resistant belts and shall be
designed for 1.50 service factor.
Sealed ball bearing motors shall be adjustable on the
motor base.
Fans shall bear the AMCA Certified Ratings Seal for
Sound and Air performance.
Each fan shall have a permanently affixed
manufacturer’s nameplate containing the model
number and serial number for future identification.
Thermal overload protectors shall be available for
single phase motors (½ thru ¾ HP).
Fan shall be supplied with a two year limited warranty
and a 5 year limited warranty on the duplex split
pillow block bearings and shaft.
Fans shall be Model UBH as manufactured by Acme
Engineering and Manufacturing Corporation of
Muskogee, Oklahoma.
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OPTIONAL ACCESSORIES
PREFABRICATED CURBS
Heavy gauge galvanized steel curbs for easy installation
of exhauster over roof openings. Acoustically lined and
thermally insulated with 1
1
/2” thick, rigid fire resistant
glass fiber to reduce heat transfer.
SELF-FLASHING TYPE (SF)
Features continuous welded and mitered corner seams
with wide base flange for easy flashing to roof. Curb top
has foam rubber gasket for better weather seal.
Self-flashing type curbs are also available in a single or
double pitch roof style.
ROOFED-OVER TYPE (RF)
Features cant strip to accommodate roofing material for
flashing up over top of curb. Wood nailer is standard.
Also available in single or double pitched roof style.
FUSIBLE HEAT RELEASE TRIP
Automatically opens butterfly dampers when temperature
exceeds predetermined temperature setting to provide
venting of heat and smoke in case of fire. Strong torsion
spring actuated by melting type fusible link, completely
independent of fan operation with no motors, switches or
electrical power required. Standard on UBH-UF and
UBH-SE models.
TYPICAL ROOF CURB
Fan
Model J K N M H
UBH16 8
UBH18
UBH24
UBH30
UBH36 8
UBH42
UBH48
UBH54
UBH60
All dimensions shown in inches.
8
8
8
8
8
8
8
DISCONNECT SWITCHES
Available with NEMA 3R raintight disconnect switches,
can be factory mounted and wired.
OUTLET SCREEN
Outlet screens available to protect dampers and fan from
debris.
INLET GUARDS
Protective guards for the fan inlet to provide protection for
the fan and nearby personnel.
OPTIONAL COATINGS
Products receiving protective coatings have each
component part painted before assembly.
CARBOLINE SANITILE (EISENHEISS)
This air dry synthetic polyester forms a black
coating that offers greater resistance to most
organic and inorganic acids.
ACCESS DOOR
Access door available for inspecting fan components,
maintenance and servicing. Standard on UBH42-60.
SHAFT SEALS
A shaft seal is available to protect the bearings from
contaminants. Not available for fans with high
temperature options.
HERESITE (AIR DRY)
A phenolic coating with greater resistance to most
organic and inorganic acids.
NOTE: For any coating selected the user
assumes the responsibility for the corrosive agent,
its concentration, temperature, moisture content
and the ultimate effect on the coating.
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CENTRIFUGAL
VENTILATION FANS
DUCT FANS
PROPELLER AND
INLINE CENTRIFUGAL
CEILING, INLINE AND
CABINET FANS
CENTRIFUGAL &
PROPELLER ROOF
EXHAUST FANS
CENTRIFUGAL &
PROPELLER ROOF
SUPPLY FANS
CENTRIFUGAL AIR
HANDLING FANS
CENTRIFUGAL AND
PROPELLER UPBLAST
ROOF EXHAUSTERS
CENTRIFUGAL AND
PROPELLER
WALL FANS
CENTRIFUGAL
INDUSTRIAL
PROCESS FANS
MAKE-UP AIR SYSTEMS
CENTRIFUGAL
HEAVY DUTY
INDUSTRIAL FANS
EXHAUST &
SUPPLY VENTS
LIMITED WAR RANTY Acme En gi neering
and Man u fac turing Cor po ra tion war rants the
prod ucts man u fac tured by Acme to be free
from orig i nal de fects in work man ship and ma te rial for two years sub ject to the terms and
con di tions of its pub lished lim ited war ranty.
War ranties on pur chased prod ucts are sub ject to the ven dor’s war ranty. Re fer to cur rent
Form MS149 for com plete lim ited war ranty
terms and con di tions.
WARNING Acme prod ucts are de signed and
man u fac tured to pro vide re li able per for mance but they are not guar an teed to be
100% free of de fects. Even re li able prod ucts
ACME ENGINEERING &
MANUFACTURING CORP.
P.O. Box 978, Muskogee, Oklahoma 74402
Telephone: 918-682-7791 Fax: 918-682-0134
www.acmefan.com e-mail: acmefan@acmefan.com October 2000 Form C24R
will ex pe ri ence oc ca sional fail ures and this
pos si bil ity should be rec og nized by the User.
If these prod ucts are used in a life sup port
ven ti la tion sys tem where fail ure could re sult in
loss or in jury, the User should pro vide ad e quate back-up ven ti la tion, sup ple men tary
nat u ral ven ti la tion or fail ure alarm sys tem, or
ac knowl edge will ing ness to ac cept the risk of
such loss or in jury.
WARNING DO NOT use in HAZ ARD OUS
EN VI RON MENTS where fan’s elec tri cal sys tem could pro vide ig ni tion to com bus ti ble or
flam ma ble ma te ri als un less unit is spe cif i cally
built for haz ard ous en vi ron ments.
Mem ber Air Move ment and Con trol As so ci a tion
CAU TION Guards must be in stalled when fan
is within reach of per son nel or within seven (7)
feet (2.134 m) of work ing level or when
deemed ad vis able for safety.
DIS CLAIMER The Com pany has made a dili gent ef fort to il lus trate and de scribe the prod ucts in this lit era ture ac cu rately; how ever, such
il lus tra tions and de scrip tions are for the sole
pur pose of iden ti fi ca tion, and do not ex press or
im ply a war ranty that the prod ucts are mer chant able, or fit for a par ticu lar pur pose, or that
the prod ucts will nec es sar ily con form to the il lus tra tions or de scrip tions or di men sion.
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