Part 3 — FIRE RESISTANCE-RATED CONSTRUCTION (CBC CHAPTER 7)

The amendment set forth in this part is necessary because California Mechanical Code does not address dampers in hazardous exhaust ducts. Hazardous exhaust systems are designed to capture and control hazardous emission generated from product handling or process, and convey those emissions to the outdoors.

(Ords. 28166, 28838.)

CBC Section 717.2.2 is deleted and replaced with the following:

717.2.2 Hazardous exhaust ducts. Penetrations of structural elements by a hazardous exhaust system shall conform to Sections 717.2.2.1 through 717.2.2.4.

717.2.2.1 Fire dampers and smoke dampers. Fire dampers and smoke dampers are prohibited in hazardous exhaust ducts.

717.2.2.2 Floors. Hazardous exhaust systems that penetrate a floor/ceiling assembly shall be enclosed in a fire-resistance-rated shaft constructed in accordance with Section 713.

717.2.2.3 Wall assemblies. Hazardous exhaust duct systems that penetrate fire-resistance-rated construction shall be enclosed in a fire-resistance-rated shaft from the point of penetration to the outlet terminal, except where the interior of the duct is equipped with an approved automatic fire suppression system. Ducts shall be enclosed in accordance with Section 713 requirements for shaft construction and such enclosure shall have a minimum fire-resistance-rating of not less than the highest fire-resistance-rated wall assembly penetrated.

717.2.2.4 Fire walls. Ducts shall not penetrate a fire wall.

(Ords. 28166, 28838, 29334, 30326.)