Fwiw
My house was built originally with electric heat and is well insulated and pretty tight.The power vent I had delivered a high cfm.I've seen others that were much less.My burner blower would not amount to 1/10 of the cfm.On damp days without a fire going the air would come down the chimney and smell the downstairs up with a wet,sooty stink.Pulled out the power vent and never had that issue again for the last 10 years.
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SIKSUKR
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