Specification Sheet
291
MODEL BVS
BELT DRIVEN UTILITY VENT SET
STANDARD CONSTRUCTION FEATURES
Inlet/L-Flange (Standard): This standard feature allows for easy duct attachment. The inlet collar allows the fan to be
removed with minimal disconnecting of the duct work.
Weather cover (Standard): Sheet metal ventilated enclosure for the motor, shaft, belts and drives for safety and weather
protection.
Access door (Standard): This standard feature is a bolted access door that allows inspection or cleaning of the wheel
compartment.
Threaded Drain Fitting (Standard): This standard feature is a 3/4” I.P.S. coupling positioned at the lowest point in fan
housing to drain moisture from the bottom of the fan housing.
Mounting Rails (Standard): Set of galvanized steel rails for easy roof mounting of all units.
ACCESSORIES/OPTIONS
cULus705 (Option): For electrical reliability. Includes weather cover and cULus705 label. Clockwise or counter clockwise
top horizontal (CW-TH or CCW-TH) discharge conguration are standard but other positions are available (must specify
discharge orientation on order).
cULus762 (Option): For use in grease laden air and/or temperatures up to 400 degrees F. With this option the fan ships
with a weather cover, drain, heat slinger, shaft seal, high temperature insulation, access door, mounting rails, additional
motor compartment ventilation and cULus762 label. Clockwise or counter clockwise upblast (CW-UB or CCW-UB) discharge
conguration are standard but top angular up (CW-TAU and CCW-TAU) positions are also available (must specify discharge
orientation on order).
Inlet/outlet Guard (Option): Heavy-gauge wire protects people and the fan entrance from unwanted debris in nonducted
installations. Outlet Guard comes with outlet ange. (Not for UL762 use).
Outlet Flange (Option): Required on the discharge for mounting of either the optional damper or the optional outlet screen.
U-ange inlet (Option): Available for easy connection to anged ductwork.
Discharge damper (Option): Heavy-duty interconnecting blade design opens by velocity. It helps prevent the entry of
unwanted objects. Outlet Flange is required (included with damper). Maximum temperature is 200 degrees F and maximum
face velocity is 3500 FPM. (Not for UL762 use). Damper cannot be used with TAD, DB, & BAD positions.
RIS Vibration Pads (Option): Set of RIS (rubber in shear) or spring type isolators help reduce vibration, improve motion
restraint, help provide proper leveling, reduce torque forces, and provide improved stability in the fan installation.
Spring Vibration Pads (Option): Set of spring pads, ship loose for eld mounting.
Grease trough (Option): Allows grease to collect in an easy to service container keeping roof area clean. Design allows
for water and grease separation.
Shaft seal (Option): Nonasbestos brous material is sandwiched between the fan housing and cover plate. It helps reduce
heat and the transfer of air from the wheel compartment. Seal does not make the fan air or gas tight.
Disconnect (Option): Available in either open or rain tight enclosure and matches the motor electrical characteristics.
Allows for fan electrical cut off for servicing or inspection safety. (Ships loose).
Heat Slinger (Option): An aluminum cooling disc mounted on the fan shaft between the inboard bearing and the fan
housing. The disc dissipates heat conducted along the fan shaft, and it also promotes circulation in the motor compartment.
The additional circulation in the motor compartment extends motor life, because it allows the motor to operate at lower
temperatures.