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Discussion Starter · #1 ·
So I installed a new microwave above the cooktop. It is vented through the wall and up to the roof. There is a damper on the back of the microwave but it is not air tight (just a piece of metal that swings freely.

I now notice that cold air is coming back into the kitchen from the microwave vent. Is there a better way to do this so cold air doesn't leak back in? Would it be better to put an electric fan on the roof and turn it off/on as needed? Do they have built in dampers?

Thanks,
Rut
 

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Why did you go clear to the roof? Would have been much easier to just go through the wall and terminate with a damper. An awful lot of grease can (and will) accumulate in such a long run of pipe.
 
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