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iso ul New UL UniFlow Fume Hoods
Fume Hood Exhaust Blowers
A complete line of belt and direct drive exhaust blowers that are chemical resistant & available in standard and explosion-proof models. HEMCO blowers are designed to operate effectively and efficiently to remove noxious & hazardous fumes. Standard 115V 60Hz & international electrical configuration of 220V 50Hz AC available.
Blower Recommendations

1. Blowers should be mounted on the roof in-order that the ducting leading to the blower inlet is under negative static pressure. If exhaust blowers are mounted inside the building, all ducting connected to the blower outlet will be under positive static pressure, if a leak were to develop in the section of the duct inside the building, toxic and or hazardous fumes could be forced out of the ductwork and into that area of the building.

2. To achieve the lowest practical noise level in the exhaust system, we suggest that the following measurements be used when there is no conflict with other specifications of the system:

a. Use vibration isolators or mounting blower exhaust assembly.

b. Install a blower fan that will deliver the correct CFM and static pressure with the lowest practical impeller wheel RPM. If possible, use a duct size large enough to keep duct velocity under 1800 FPM velocity.

c. Use a flexible connection at the fan inlet to isolate mechanical transmission of noise from the ducting between the hood and the exhaust blower.

d. Exhaust blower system should be designed with the fewest possible elbows or other fittings. Use radius type elbows & avoid using square elbows. Use gradual tapered transitions where necessary, & avoid abrupt changes in configuration or cross sectional area.

3. When ordering an exhaust blower, specify the orientation of discharge desired. Vertical up blast discharge is the most common and will be supplied unless otherwise specified.

4. All fans are shipped with clockwise rotation when viewed from the motor end of the assembly.

5. For normal usage, the standard for both the blower housing and impeller wheel is epoxy coated.

6. Blowers used for hood exhaust at altitudes above 1,000 feet, may require a correction factor to provide the correct CFM and static pressure.

Contact factory for details relating to your specific application.

Epoxy Coated Steel Blower Belt Drive
Epoxy Coated Steel Blower
Blower
  Standard (STD) belt drive steel blower and impeller wheel are epoxy coated for superior chemical resistance. Explosion-proof blowers (EXP) have epoxy coated, non-sparking aluminum impeller wheel. V-belt drive and adjustable pulleys permit field balancing. Seven discharge positions to suit installation. Weather housing is furnished. Motor has thermal overload protection. Specify: 115 V single phase, 230 V single phase, 230/460 V three phase or 208 V (consult factory). 1 year manufacturer’s warranty
 
Catalog Number and Static Pressure
cfm A
Inlet
Diameter
B
Outlet
Size
1/2” Static Pressure 3/4” Static Pressure 1” Static Pressure 1 1/2” Static
Pressure
HP STD EXP HP STD EXP HP STD EXP HP STD EXP
296 8 7/8” 10 1/8” x 4 1/8” 1/4 51701 51801 1/4 51702 51802 1/4 51703 51803 1/4 51704 51804
474 8 7/8” 10 1/8” x 4 1/8” 1/4 51705 51805 1/4 51706 51806 1/4 51707 51807 1/2 51708 51808
652 8 7/8” 10 1/8” x 6 3/8” 1/2 51709 51809 1/2 51710 51810 1/2 51711 51811 1/2 51712 51812
800 8 7/8” 10 1/8” x 6 3/8” 1/2 51713 51813 1/2 51714 51814 1/2 51715 51815 3/4 51716 51816
914 9 7/8” 11 1/2” x 8 1/4” 1/2 51717 51817 1/2 51718 51818 -- -- -- -- -- --
1044 9 7/8” 11 1/2” x 8 1/4” 1/2 51719 51819 1/2 51720 51820 3/4 51721 51821 -- -- --
1175 9 7/8” 11 1/2” x 8 1/4” 1/2 51722 51822 1/2 51723 51823 3/4 51724 51824 -- -- --
1240 9 7/8” 11 1/2” x 8 1/4” 1/2 51725 51825 1/2 51726 51826 3/4 51727 51827 3/4 51728 51828
1240 11 7/8” 13 3/8” x 8 1/4” 1/3 51729 51829 1/2 51730 51830 -- -- -- -- -- --
1506 11 7/8” 13 3/8” x 8 1/4” 1/2 51731 51831 1/2 51732 51832 3/4 51733 51833 -- --  
1771 11 7/8” 13 3/8” x 8 1/4” 1/2 51734 51834 3/4 51735 51835 3/4 51736 51836 1 51737 51837
Epoxy Coated Steel Blower Direct Drive
Direct Drive Blower
Direct Drive Blower
  Direct drive steel blower and impeller wheel are epoxy coated for superior chemical resistance. Explosion proof blowers have epoxy coated non-sparking aluminum impeller wheels. Motor is 115V, 1 phase and has thermal overload protection. 1 year manufacturer’s warranty
 
Catalog Number and Static Pressure
A
Inlet
Diameter
B
Outlet
Size
HP STD EXP 1/4” SP 1/2” SP 3/4” SP 1” SP
cfm cfm cfm cfm
6” 7” X 4-3/8” 1/6 51177 51178 565 515 440 300
8” 8-3/4” X 5-7/16” 1/3 51179 51180 935 875 800 712
9” 10-1/8” X 4-1/8” 1/2 51181 51182 1050 980 920 850
9” 10-1/8” X 5-1/8” 3/4 51183 51184 1260 1220 1180 1100
  Standard motors are 115V, 60Hz / 1 phase. Explosion proof motors are 115/230V, 60Hz, 1 phase. Other voltage, hertz, and phase motors are available.
Fume Hood Exhaust Blowers Ordering Info
HEMCO offers a complete line of chemical resistant non-metallic exhaust blowers in belt drive or direct drive options in standard or explosion proof models. Ideal for applications where corrosion resistance is critical. These blowers are available in polypropylene or fiberglass construction.
Blower Recommendations

1. It is recommended that exhaust blowers be located at the end of the ducting which is typically roof mounted. This ensures a negative pressure through out the ventilation system. However for applications where the duct is going directly out through a wall above a fume hood, one option
is to have a fiberglass direct drive blower installed in the top of the fume hood. By having the blower internally mounted, the installation is simplified and convenient for duct connection and servicing. However there would be
an airflow sound element associated to having the blower hood mounted.

2. By keeping the exhaust duct as short and as straight as possible, the total
resistance will be reduced and by keeping the diameter of the duct correctly sized to the flow volume, noise and static pressure can be reduced.

3. Blower wheels for polypropylene and fiberglass blowers are polypropylene.

4. Vibration isolators are recommended when mounting the blower assemblies

5. HEMCO recommends that a sash stop be installed on the fume hood to limit the sash height for operation. By having stop at a half open position, the total CFM can be reduced by 50%; thus by reducing the volume, energy loss, duct diameter, motor and blower size, and sound is reduced.

Blower Description
UniFlow SE & LE Fume Hoods
Hood
Width
Hood
Depth
Full
Open cfm
1/2
Open cfm
36” 30” 438 241
48” 30” 772 385
60” 30” 938 474
72” 30” 1162 592
96” 30” 1613 800
UniFlow CE Fume Hoods
Hood
Width
Hood
Depth
Full
Open cfm
1/2
Open cfm
30” 24” 378 189
36” 24” 460 230
48” 24” 654 327
60” 24” 1046 523
72” 24” -- --

• CFM at 100 fpm face velocity

• Housing is constructed of heavy gauged galvanized steel, with a baked
enamel finish, to resist weather & chemical exposures.

• Flange inlet collars enable easy connection to ductwork.

• Wheel is dynamically balanced to minimize noise and increase efficiency.

• Ball bearing pillow blocks are pre-lubricated and resistant to both moisture and dirt.

• Shaft is constructed of polished steel with a coating to prevent rust and corrosion.

• Motors meet NEMA standards for single speed motors.

• These blowers are ideally suited for both supply and exhaust applications in
laboratories, educational, pharmaceutical, industrial, and other applications.

Polypropylene Belt Drive Blowers
Polypropolene Blower
  High efficiency impellers produce low power consumption, reduced operating costs and quiet operation. 20 forward curved blades, in fire retardant polypropylene. Non-static and oil resistant v-Belt, cast iron pulleys, adjustable pulleys available, adjustment for tensioning and belt replacement. 230V explosion proof, non sparking, chemical resistant for hostile or hazardous environments. 115V single phase or three phase. Non-static and oil resistant V-belt, cast iron pulleys, adjustable pulleys available, adjustment for tensioning and belt replacement.
1 year manufacturer’s warranty
 
Catalog Number and Static Pressure
cfm A
Inlet
Diameter
B
Outlet
Diameter
0.5” Static Pressure HP 0.75” Static Pressure HP 1.0” Static Pressure HP
HP STD EXP HP STD EXP HP STD EXP
400 6” 6” 1/4 51450 51850 1/4 51460 51860 1/4 51470 51870
800 8” 8” 1/4 51451 51851 1/3 51461 51861 1/3 51471 51871
1000 8” 8” 1/2 51452 51852 1/2 51462 51862 1/2 51472 51872
1200 10” 10” 1/2 51453 51853 1/2 51463 51863 1/2 51473 51873
1600 10” 10” 1 51754 51854 1 51464 51864 1 51474 51874
Variable Motor Speed Drive
 

Motor speed control can be used to manually adjust blower cfm. Adjustable speed control for 3-phase motors 3/4 to 10 horsepower at 230/460 volts and 50/60Hz. these drives provide high operation efficiency and constant input power factor throughout the entire speed range of 3 to 60Hz. Drives are rugged, reliable and backed by years of manufacturing and application experience in motors and controls. These drives are tailored to the variable torque loads in fans or fume hoods.

1/2 -5HP 230V 3ph, 50/60 Hz.....................................................................................Cat.No. 51402

     
  HEMCO Corporation 711 S. Powell Road Independence, MO 64056 816-796-2900 800-779-4362
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