Cold weather damper for island exhaust
I am looking for advice for a damper on the exhaust-side of my cooktop,island exhaust duct. The fan is 600 cfm and has a gravity damper just above the fan inside the hood meaning the 8″ duct between the damper and outside wall is filled with cold air leaking into the kitchen. I am looking into adding a second damper – probably mechanical that is wired to the hood motor, to open and close when the fan is switched on and off. My HRV guy told me to get a Broan MD8. Broan says no. Any help is appreciated. New home, Closed cell. Southern coastal Maine. HRV. Thanks!
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