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§ Chapter 13 IRC 2021

General Mechanical System Requirements

8 entries from Chapter 13 of IRC 2021, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.

ED IRC 2018 ED IRC 2021 ED IRC 2024
§ 01   Sections

All 8 entries.

Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.

Mechanical Equipment Must Be Installed by Its Listing and Instructions
M1301.1
Does code require HVAC installers to follow the manufacturer instructions?
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HVAC Equipment Must Be Approved for the Intended Installation
M1302.1
Can I install any used furnace or air handler if it works?
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HVAC Appliance Nameplates Need to Remain Visible
M1303.1
Can the furnace label be covered by a closet wall or access panel?
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Mechanical Appliances Must Use the Fuel They Are Listed For
M1304.1
Can a natural gas furnace be connected to propane?
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Furnace Closets Need Working Clearance in Front of Equipment
M1305.1
How much space is required in front of a furnace in a closet?
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Attic Furnaces Need Code-Compliant Access and Working Space
M1305.1.3
What access is required for a furnace installed in an attic?
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Mechanical Equipment Must Keep Required Clearance to Combustibles
M1306.1
Can wood framing or storage touch a furnace, flue, or duct?
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Garage Mechanical Equipment Must Be Protected From Vehicle Damage
M1307.3.1
Does a furnace or water heater in a garage need bollards?
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§ 02   Chapter navigation