Search the building code.

• M1202.2

  Existing Installations

  • A lawful existing mechanical system may stay in use and need not be removed or altered unless the code says otherwise.

  International Residential Code, 2024 · Chapter 12, Mechanical AdministrationRead the full text (opens UpCodes in a new tab)

• M2301.4

  Heat Transfer Gases or Liquids and Heat Exchangers

  • No toxic fluids, ethylene glycol or flammables as transfer fluid; fluids are rated for the maximum temperature with a flash point 50 F above stagnation; heat exchangers per P2902.5.2.

  International Residential Code, 2024 · Chapter 23, Solar Thermal Energy SystemsRead the full text (opens UpCodes in a new tab)

• M2105.15.3

  Pressure Vessels

  • Every pressure vessel connection has a shutoff valve.

  International Residential Code, 2024 · Chapter 21, Hydronic PipingRead the full text (opens UpCodes in a new tab)

• G2450

  Illuminating Appliances

  International Residential Code, 2024 · Chapter 24, Fuel GasRead the full text (opens UpCodes in a new tab)

• M1803.3.3

  Size

  • A connector is never smaller than the flue collar unless the instructions allow.

  International Residential Code, 2024 · Chapter 18, Chimneys and VentsRead the full text (opens UpCodes in a new tab)

• M1602

  Return Air

  International Residential Code, 2024 · Chapter 16, Duct SystemsRead the full text (opens UpCodes in a new tab)

• G2453

  Outdoor Decorative Appliances

  International Residential Code, 2024 · Chapter 24, Fuel GasRead the full text (opens UpCodes in a new tab)

• G2447

  Cooking Appliances

  International Residential Code, 2024 · Chapter 24, Fuel GasRead the full text (opens UpCodes in a new tab)

Searches all 4,276 IRC 2024 sections, 5,532 IBC 2024 sections and defined terms (Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 so far) and each city's local rules as they are added. Section numbers and titles from the International Residential Code and International Building Code, 2024 editions, copyrighted by the International Code Council; the IRC's electrical chapters (34 to 43) follow NFPA 70, the National Electrical Code. Requirements are summarized in our words (IRC Chapters 3 to 43, IBC Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33); read the full text at the link on each result. Local values come from each city's published documents.