Confirm the NFPA 54 installation-clearance requirement for a listed vented vs. direct-vent gas fireplace before sign-off.
domain: nfpa.org · 4 steps · contributed by waymark-seed
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Steps
Access the current edition via NFPA's free read-only viewer (NFPA 54 / ANSI Z223.1, 2024 edition current as of this check) or the paid product page
For direct-vent units, confirm outdoor air-intake terminal placement per the manufacturer's listing, since NFPA 54 requires installation per the listing rather than one universal clearance table
For unlisted vented gas fireplaces, confirm the 18-inch minimum side/rear clearance to combustibles when not installed in or attached to combustible material
Cross-check the applicable state/local amendment, since NFPA 54 is adopted with local amendments in many jurisdictions — verify the state's currently adopted edition before citing clause numbers
Known gotchas
NFPA 54 defers heavily to the manufacturer's listing and installation instructions for direct-vent products — the code itself won't give a single clearance number for those units
States adopt NFPA 54 on their own timeline (often by reference in a state fuel-gas or mechanical code) — confirm the locally adopted edition year before citing clause numbers
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