Damper located at the air inlet slot

The damper located within the ventilator elimiates possible inference's with duct shafts, building structure, plumbing and mechanical equipment often experienced with duct collar dampers.

Three position damper

Position 1-Exhaust cycle. Primary grease extraction baffle with grease catch design.

 

Total of three baffles with "Grease Catch" design providing 95% grease extraction efficiency. Eliminates or reduces duct and fan cleaning frequencies and reduces potential for duct fires.

Position 2-Wash cycle. During wash cycle the damper closes forward sealing off the air inlet slot and stays closed until fan is restarted.

Allows superior wash of the main grease gutter, and prevents conditioned room air from going up the exhaust system.

Position 3-Fire cycle. Damper closes in the the direction of air flow, back against a pipe support, when the fire mode is initiated.

Closing in direction of the air flow, eliminates the potential of the damper being forced open during a severe fire.

Electric motor/spring drive fail safe damper control switch.

Fail safe circuitry coupled with spring drive, allows closure of the fire damper even if electrical power is interrupted or turned off. Resets to normal operating position when fan is restarted.

Wash sprays come on automatically during fire mode

When in the fire mode, water builds up on the back of the closed damper, reducing the temperature and the possibility of damper warpage.

Daily operation of fire damper and washing of damper bearings

Daily operation, and washing of the bearings, ensure proper operation during a fire mode.

Full length, non-gasketed hinged-inspection doors.

Provides easy access to ventilator interior, including fire extinguishing system nozzles, for inspection and routine service without going up through canopy. No gaskets to wear out or panels to remove or replace.