Can I use a flexible duct for my range hood?
Saturday, January 2, 2021
A flexible duct is not approved by code or manufacturer’s installation manuals. The International Residential Code (IRC-M1503.1) states “the duct serving the hood shall have a smooth interior surface.” Both flexible and semi-rigid ducts have a corrugated interior. An example of how not to do it is shown above.
Here’s excerpts from two hood manufacturer’s installation manuals:
•• Do not use flexible or corrugated duct. This type of duct will restrict airflow and reduce performance.
** Only use smooth, galvanized, metal duct.
•• Never use plastic venting or plastic ducting.
And this is a diagram from a VentAHood installation manual.
Also, see our blog posts What are the code requirements for a range hood duct? and Is a range hood exhaust fan required in the kitchen? and Does a combination microwave and range hood require a dedicated circuit? and What are the most common defects with over-the-range microwaves? and What is the maximum recommended height above the floor for an above-the-range microwave?
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