Neil Devroy

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Range Hoods and Airflow Quality

David McNulty uses hoods with an airflow of 600 cfm for standard cooktops but upgrades to a 1,200-cfm hood for commercial-style ranges. He cautions that hoods over 900 cfm exert a powerful pull that can cause problems with air quality. In Minnesota, if designers specify 1,200-cfm hoods, they must provide another opening to create positive pressure to prevent back draft. More

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