Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
If you prefer to install a passive makeup air duct rather than a powered makeup air unit, the duct must include a motorized damper that is wired to come on simultaneously with the range-hood fan. Broan sells motorized dampers for this purpose, and also provides detailed and useful installation instructions.
Concerning the reference to NFPA standards, I tried to pin down what GE was hinting at. I contacted Allan Fraser, a senior building specialist with NFPA. After hearing me read the relevant paragraph from the GE instruction booklet, Fraser said, “That is a bad reference. As far as makeup air for range hoods is concerned, NFPA doesn’t cover it. Frankly, it is not an issue on our radar screen.”
As a stop-gap measure, a homeowner with backdrafting problems can open a window near the kitchen every time the range-hood fan is turned on. Although this solution works, it won’t satisfy most homeowners, and builders who suggest this remedy may still be legally liable for future backdrafting problems.
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