IMC · 2024 International Mechanical Code

§1007.1 · Combustion air for Category I basement appliances

Local amendment on §1007.1 for the IMC 2024 Minnesota jurisdiction.

Plain-English explainer

The Minnesota amendment to §1007.1 narrows the IMC general provision: Category I basement appliances in Minnesota may draw combustion air from a large enough inside space ONLY when that space has a tight envelope and a listed combustion-air opening. The drafter cites it for any basement water-heater or furnace rough-in in the seven-county metro where outside combustion air is not yet run.

Why inspectors flag this

A Minnesota basement appliance relying on the IMC "large enough inside space" pathway without a tight envelope and a listed opening fails this amendment; the drafter surfaces the rule so the rough-in plans the right combustion-air detail before the inspector walks the site.

As quoted in the code: Combustion air for Category I basement appliances in Minnesota may be drawn from a large enough inside space only when that space has a tight envelope and a listed combustion-air opening; the local amendment narrows the IMC general provision.

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