Chapter 8 — CHIMNEYS AND VENTS
802.15 Obstruction of Flow — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 802.15 · Effective January 1, 2026 · Official source: Building Standards Commission
Devices that retard the flow of vent gases shall not be installed in a vent connector, chimney, or vent. The following shall not be considered as obstructions:
(1) Draft regulators and safety controls specifically listed for installation in venting systems and installed in accordance with the manufacturer’s installation instructions.
(2) Approved draft regulators and safety controls designed and installed in accordance with engineering methods.
(3) Listed heat reclaimers and automatically operated vent dampers installed in accordance with the manufacturers’ installation instructions.
(4) Vent dampers serving listed appliances installed in accordance with Section 803.1 or Section 803.2 or engineering methods.
(5) Approved economizers, heat reclaimers, and recuperators installed in venting systems of appliances not required to be equipped with draft hoods, provided the appliance manufacturer’s instructions cover the installation of such a device in the venting system and performance in accordance with Section 802.3 and Section
802.3.1 is obtained. [NFPA 54:12.16]
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