having finally vented the exhaust fan of our over the stove mounted GE microwave, i am noticing a not insignificant amount of cold air seeping in. the unit exhausts to an outdoor wall cap with a sring loaded flap meant to keep out critters. the microwave has a similar metal flap that is opened by the exhaust air whenever the fan is activated. anyone here know of anything i could insert between the squirrel cage fan and the wall cap to reduce cold air infiltration? thanks.
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