Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
Some Passivhaus builders are experimenting with range-hood fans that don’t exhaust air to the exterior. Instead, they pull air from above the stove and pass it through a charcoal filter before returning the air to the kitchen. On the ceiling of the kitchen, in a location as far from the stove as possible, they also install a grille connected to the exhaust system of the home’s HRV.
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.
Armed with the limited recommendations provided by GE’s installation instructions, I sought more information by placing two calls to the GE Answer Center (800-626-2000), asking, “Does GE have any recommendations on providing makeup air for a 1,200-cfm GE range hood installed in a residential kitchen?” The first GE expert responded, “What is makeup air?” An explanation was provided. She responded, “Do you mean you want to know the cfm of the fan?” After further discussion, I was put on hold. A few minutes later, the expert returned to the phone to report, “That information is not something we would have here.”
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