Chapter 8 — CHIMNEYS AND VENTS
802.4 Type of Venting System to be Used — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · 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) § 802.4 · Effective January 1, 2026 · Official source: Building Standards Commission
The type of venting system to be used shall be in accordance with Table 802.4. [NFPA 54:12.5.1]
802.4.1 Plastic Piping. Where plastic piping is used to vent an appliance, the appliance shall be listed for use with such venting materials and the appliance manufacturer’s installation instructions shall identify the specific plastic piping material. The plastic pipe venting materials shall be labeled in accordance with the product standards specified by the appliance manufacturer or shall be listed and labeled in accordance with UL 1738. [NFPA 54:12.5.2]
802.4.2 Plastic Vent Joints. Plastic pipe and fittings used to vent appliances shall be installed in accordance with the appliance manufacturer’s installation instructions. Plastic pipe venting materials listed and labeled in accordance with UL 1738 shall be installed in accordance
with the vent manufacturer’s installation instructions. Where primer is required, it shall be of a contrasting color.
[NFPA 54:12.5.3]
802.4.3 Special Gas Vents. Special gas vents shall be listed and labeled in accordance with UL 1738 and installed in accordance with the special gas vent manufacturer’s installation instructions. [NFPA 54:12.5.4]
TABLE 802.4
TYPE OF VENTING SYSTEM TO BE USED
[NFPA 54: TABLE 12.5.1]
| APPLIANCES | TYPE OF VENTING SYSTEM | LOCATION OF REQUIREMENTS |
|---|---|---|
| Listed Category I appliances Listed appliances equipped with draft hood Appliances listed for use with Type B gas vent |
Type B gas vent | Section 802.6 |
| Listed Category I appliances Listed appliances equipped with draft hood Appliances listed for use with Type B gas vent |
Chimney | Section 802.5 |
| Listed Category I appliances Listed appliances equipped with draft hood Appliances listed for use with Type B gas vent |
Single-wall metal pipe | Section 802.7 |
| Listed Category I appliances Listed appliances equipped with draft hood Appliances listed for use with Type B gas vent |
Listed chimney lining system for gas venting |
Section 802.5.3 |
| Listed Category I appliances Listed appliances equipped with draft hood Appliances listed for use with Type B gas vent |
Special gas vent listed for these appliances |
Section 802.4.3 |
| Listed vented wall furnaces | Type B-W gas vent | Section 802.6, Section 907.0 |
| Category II, Category III, and Category IV appliances |
As specified or furnished by manufacturers of listed appliances |
Section 802.4.1, Section 802.4.3 |
| Incinerators | In accordance with NFPA 82 | In accordance with NFPA 82 |
| Appliances that can be converted to use of solid fuel Unlisted combination gas- and oil-burning appliances Combination gas- and solid-fuel-burning appliances Appliances listed for use with chimneys only Unlisted appliances |
Chimney | Section 802.5 |
| Listed combination gas- and oil-burning appliances | Type L vent | Section 802.6 |
| Listed combination gas- and oil-burning appliances | Chimney | Section 802.5 |
| Decorative appliances in vented fireplace | Chimney | Section 911.3 |
| Gas-fired toilets | Single-wall metal pipe | Section 802.7, Section 928.3 |
| Direct vent appliances | — | Section 802.2.6 |
| Appliances with integral vents | — | Section 802.2.7 |
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