Regulatory Compliance Flashcards

Under the IRC, a kitchen exhaust hood capable of exhausting more than how many cfm requires makeup air?

Answer: 400 cfm

IRC M1503.6 requires makeup air for kitchen exhaust systems capable of exhausting more than 400 cfm.

Where may a residential range hood exhaust duct legally terminate?

Answer: Outside the building

IRC M1503.1 requires domestic cooking exhaust to discharge to the outdoors, never into attics, crawl spaces or concealed spaces.

Which duct type is required for a domestic kitchen range hood under the IRC?

Answer: Smooth-interior single-wall galvanized steel, stainless steel or copper

IRC M1503.2 requires a single-wall duct of galvanized steel, stainless steel or copper with a smooth inner wall.

Range hood ductwork serving a domestic kitchen must be equipped with which component?

Answer: A backdraft damper

IRC M1503.3 requires kitchen exhaust ducts to be airtight and fitted with a backdraft damper.

How must makeup air for a high-cfm kitchen hood be controlled per the IRC?

Answer: Automatically to operate simultaneously with the exhaust

Makeup air dampers or fans must be automatically controlled to operate when the exhaust system runs.

Absent a manufacturer's listing allowing less, what minimum vertical clearance does the IRC require between a cooking top and unprotected combustible material above it?

Answer: 30 inches

IRC M1901.1 requires 30 inches to unprotected combustibles, reducible to 24 inches with protection or per the appliance listing.

A client wants a commercial-style 1,200 cfm hood in a tight new home; what code issue must the designer address first?

Answer: Makeup air provision

Exhausting 1,200 cfm from a tight house without makeup air can backdraft combustion appliances, so the IRC requires makeup air above 400 cfm.