Forced air flaps

[Goodgeyman]

Morning
I have my heater matrix out to replace faulty fan. In the process I found one forced air flap just laying inside the housing. What purpose do these flaps serve? I can see the pivot point for the missing one are broken so replacing will not be easy. I am guessing they are just to keep bugs out as they are not controlled in any way other than gravity?


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[bigherb]

They stop the air from the fan blower being blown back out the intake.

[Goodgeyman]

Thanks for the reply I have been looking at it today and only twigged when I tried the new fan out and saw the flap close under the air pressure. I have made a replacement flap for the missing one out of a piece of plastic with a wire across the top. Doesn't look great but seems to push closed okay.



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