We have a vented kenmore range hood that is vented thru a pipe (out the top of the hood) to the outside of the house; air comes out the top of the hood and blows into the kitchen. why is air blowing out into the kitchen?

Sorry to read about your problem, I hope this helps you out.

you may have a clog, in the vent pipe, not uncommon in the winter for wild things to build nest..
their is also a air damper plate, that might be stuck, this damper prevents outside air from blowing back in

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