I can hear almost a air suction sound. Osburn 2200. Bought new gasket 7/8 black, lady did not know if high density. Either did I. Did not have old gasket. Dealer replaced with white gasket (felt like a shoelace) tired if calling dealer and waiting I went to a shop and got a gasket. Install went good. Had to tighten door that's why I am thinking it was not hd. Are all black high density. Either way check out video. Damper closed. Very rarely have ever seen secondaries (not sure what they look like either , just figure I'd know when I see it ) well can't figure out how to post video. Pretty much flames are coming right from where door meets stove. I can hear air pulling
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