What Type of Duct is Best for Venting a Range Hood? - Airflow …
Flexible duct for range hood is not allowed by the IRC (International Resident Code) for good reasons. According to the code, ductwork must have a rigid inner build. This restriction is mainly because of safety reasons. A flexible duct is not suitable because grease and dirt can build up with time and may potentially lead to a house fire.
ductwork for range hood - Houzz
www.houzz.com › 2573298 › ductwork-for-range-hoodIt says, "Range hoods may be connected either to round or rectangular ducts, but the ductwork must be metal. Smooth ducts are preferable to flexible style, as that is not recommended by the National Uniform Mechanical Code standards. Plastic ductwork, especially 4" dryer duct should never be used on a range hood installation" kitchenredo2