Published at Wednesday, 30 January 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
Every time an exhaust fan removes air from your house, an equal volume of air must enter. The air that enters cracks in a home’s envelope to replace air that is exhausted is called “makeup air.” Two trends affecting makeup air are causing increasing problems for homeowners: homes are getting tighter, and range-hood fans are getting more powerful.
While these by-products may simply sound like nuisances, studies have shown that cooking without proper ventilation is one cause of poor indoor air quality that can negatively affect your health. That's why the International Residential Code and the U.S. Environmental Protection Agency strongly advise homeowners to install a vent hood to capture, filter, and then expel the fumes outside through a vent in an exterior wall or on the roof.
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.
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