Fresh air releif vent

[Waramanga]

Hi all,
who makes air relief vents, you know ones with backdraft dampers. I need one to flow around 400L/S out of a room through a wall to the outside.
thanks for your help.

 

[sridhar1312]

SYSTEM AIR has got IRIS dampers which can be used for the application. You may visit SYSTEM air website.

 

[HVAC68]

so does Ruskin

HVAC68