Interpretation #8856

Published January 06, 2024

Original Request

Code Version: 2017
Code: RESIDENT
Code Description
Chapter: Chapter 15 Exhaust Systems
Section: M1503.1
Topic: Range Hood Exhaust Duct

Question

Is it the intent of M1503.1, when stated to have a "smooth interior surface", that screws shall not be used for mechanically fastening ducts?

Answer Published 12/21/2023 at 8:37 AM

Kitchen exhaust hoods in residential applications are not considered grease ducts. Therefore, screws are permitted to be used. Clothes dryers ducts are not allowed to have screws because of potential for lint buildup. The intent of the smooth interior surface is regarding the type of duct being used not the attachments or protrusions within it.

Commentary

None.