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Thinking this doesn't have a back draft damper.


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M1503.1 General.

Range hoods shall discharge to the outdoors through a single-wall duct. The duct serving the hood shall have a smooth interior surface, shall be air tight, shall be equipped with a back-draft damper, and shall be independent of all other exhaust systems. Ducts serving range hoods shall not terminate in an attic or crawl space or areas inside the building.

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M1503.2 Duct material.

Single-wall ducts serving range hoods shall be constructed of galvanized steel, stainless steel or copper.

This is from the 2012 IRC

Key words for me are "smooth interior" and must be "galvanized steel, stainless steel, or copper" .

Flexible metal ducts do not have smooth interiors and are not steel or copper, usually aluminum. Of course flexible plastic ducts are verboten anyway.

It may be a microwave but if it is venting the stove top then it is a range hood.

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