919.1 Conversion burners
Conversion-burner installations must conform to ANSI Z21.8. This is an installation requirement. Section 919.1 does not describe ANSI Z21.8 as a product listing or testing requirement.
Section 919.1 does not provide clearance dimensions, connection details or testing procedures. Verify detailed requirements in the referenced standard before carrying them into the design.
Why it matters
Specifying the burner and establishing the installation basis are separate tasks. A schedule entry identifies equipment. It does not explain how the proposed conversion satisfies the referenced installation standard. For plan review, the proposed burner, the appliance it will serve and the scope of work should be clear.
Where to show it
Equipment schedule: proposed burner and appliance served
Plans and details: existing installation and proposed changes
Specifications and submittals: ANSI Z21.8 installation basis and supporting documentation
Do
Identify the existing appliance and proposed burner by manufacturer and model.
Review ANSI Z21.8 before finalizing installation details.
Coordinate the conversion scope across affected drawings.
Resolve equipment-identification gaps before approving substitutions.
Do not
Treat physical fit or matching capacity as proof of installation compliance.
Present ANSI Z21.8 as a listing requirement imposed by Section 919.1.
Add generic clearances or testing criteria without a verified basis.
Field tip
For an existing installation, photograph the appliance nameplate and surrounding connections before finalizing the conversion scope. Compare those records with the proposed burner submittal so the review addresses the actual installation, not a generic detail. Next: #191 — IMC 920 Unit Heaters.
In Florida
In Florida the mechanical code is the 2023 FBC-Mechanical (8th Edition), which is based on the 2021 IMC and generally follows the same Chapter 9 numbering. Confirm the Florida section text, any Florida amendment and the referenced standard editions before relying on a 2024 IMC detail. The 9th Edition applies to permit applications on or after 12/31/2026 (state adoption pending).
Questions to settle before design
What appliance is being converted, and are its manufacturer and model known?
Who provides the ANSI Z21.8 installation basis and its supporting documentation?
Which drawings change with the conversion, and are they all in the permit set?
MasterBuild field checklist
Photograph the appliance nameplate and the surrounding connections before design.
Compare the existing installation with the proposed burner submittal.
Resolve any equipment-identification gap before approving the burner.
MasterBuild recommendation: process steps for design and site review, not code text.
Where MasterBuild helps
PE-led MEP design in Miami, or send your project background. The fee is quoted in writing before work starts.
Code basis
2024 IMC Section 919 model-code education from the owner-published Daily Code Talk. Confirm the locally adopted edition and amendments, the selected product listing and manufacturer instructions, and the authority having jurisdiction. Read the ICC 2024 IMC Chapter 9 for the complete model-code provisions.