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.
Since most residential kitchens are adequately served by a 150-cfm or 250-cfm range hood, it comes as no surprise that a 1,200-cfm range hood can cause depressurization and backdrafting problems. However, the homeowner’s claim that GE had never heard of such problems needed to be verified, so I set out to discover whether GE’s experts are really as clueless as Morris alleged.
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.
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