Published at Thursday, 31 January 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.
Here’s the new IRC provision, which is found in section M1503.4: “Exhaust hood systems capable of exhausting in excess of 400 cfm shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.
If you've ever forgotten to turn on the fan while trying to get a nice crust on a pan full of fish fillets, you're familiar with the importance of good ventilation. In addition to whisking away unwanted odors, vent hoods remove moisture and grease, as well as carbon monoxide, nitrogen dioxide, and other pollutants that cooking can release into the air.
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