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What are the code requirements for a range hood duct?
Saturday, January 2, 2021
The general requirements of the International Residential Code (IRC-M1503.1 and .2) for range hoods are:
•• Must discharge to the outdoors (not terminate in attic).
•• Have a smooth interior surface.
•• Be airtight.
•• Have a back-draft damper.
•• Constructed of galvanized steel, stainless steel, or copper.
An exception is allowed for installation of a range hood that does not discharge outdoors if mechanical or natural ventilation is provided, and it is listed and labeled by manufacturer as ductless and installed per manufactuer’s instructions. There are also additional standards for exhaust rates and makeup air (IRC-M1503.3 and .4).
Also, see our blog posts Can I use a flexible duct for my range hood? 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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