Published at Wednesday, 30 January 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
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.
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.
Venting the polluted air out of your house is always preferable to recirculating it. Recirculating fans use charcoal filters to clean the air and release it back into the house when ducting to the outside is impossible, as in many apartment buildings. When it's the only option, a recirculating hood is better than no ventilation at all, but this type should never be used with pro-style appliances.
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