Upblast Centrifugal Roof Exhaust
11
Fan Inlet Connections
In order to ensure proper fan performance, caution must be exercised in fan placement and connection to the ventilation
system. Obstructions, transitions, poorly designed elbows, improperly selected dampers, etc, can cause reduced
performance, excessive noise and increased mechanical stress. For performance to
be as published, the system must provide uniform and stable airflow into the fan.
Poor
Poor
Good
Good
Dampers must open fully. Use
motorized dampers in low airflow
applications to reduce losses.
Avoid sharp turns or entrance
conditions which cause uneven
flow. Use turning vanes in elbows
to reduce adverse effects.
Provide uniform airflow at fan inlet
to ensure optimum performance.
Provide uniform airflow at fan inlet and
through the damper to ensure optimum
performance. Curb cap should be three
wheel diameters from the radius. Use
turning vanes in duct when possible.
Motor Cover
Belt
Motor
Pulley
Motor
Fan Shaft
Curb Cap/
Venturi
Shaft Pulley
Drive Frame
Assembly
Vibration
Isolators
Vertical
Support
Windband
Wheel
Breather Tube
Birdguard in tube
Hoodband
Disconnect
Switch
Hoodband
Bracket
Horizontal
Support
Belt Drive
Direct Drive
Curb Cap/
Venturi
Wheel
Vibration
Isolators
Motor
Hoodband
Conduit
Chase
Horizontal
Support
Vertical
Support
Hood Clip
Motor Cover
Birdguard
Breather Tube
Motor
Support Pan
Disconnect
Drain
Trough
Windband
Parts List
CAUTION
A fan manufactured with an explosion resistant motor
does not certify the entire unit to be explosion proof.
Refer to UL Listing mark for the fans approved usage.
CAUTION
La présence d’un moteur antidéflagrant sur un
ventilateur ne garantit pas que tout l’appareil est
antidéflagrant. Pour connaître les emplois autorisés
de l’appareil, voir son marquage de conformité UL.
NOTE
For replacement, the windband, vertical supports,
drain trough and curb cap/venturi come as one
complete assembly.
Each fan bears a manufacturer’s nameplate with model
number and serial number embossed. This information
will assist the local representative and the factory in
providing service and replacement parts. Before taking
any corrective action, make certain unit is not capable
of operation during repairs.
