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International Mechanical Code (IMC) Explained: What's on the HVAC & Mechanical Inspector Exams

October 17, 2026 · 10 min

Chapters

  1. The Short Answer
  2. What the I M C Is
  3. Editions and Adoption
  4. IMC vs. UMC, IRC and IFGC
  5. The Chapter Map, One to Eight
  6. The Chapter Map, Nine to Fifteen
  7. Which Exams Use It
  8. Open Book Habits
  9. Sample Questions One and Two
  10. Sample Questions Three and Four
  11. Your Recap

Audio from the Open Exam Hub video of the same name; the video shows the numbers and practice questions on screen.

International Mechanical Code (IMC) explained: what the IMC is, which edition to study (2021 International Mechanical Code vs 2024), a chapter-by-chapter map, and what's on the HVAC exam and mechanical inspector exams. As of October 2026, ICC's M2 Commercial Mechanical Inspector exam is listed as 50 multiple-choice questions in 2 hours, open book, and is regulated by the IMC; the store lists a $320 fee. This guide covers Uniform Mechanical Code vs International Mechanical Code (IAPMO UMC vs ICC IMC), how the IMC fits with the International Residential Code, International Plumbing Code and International Fuel Gas Code, ICC M2 content areas with weights, open-book exam habits, and 4 original IMC exam questions from real sections (condensate drain 307.2, attic appliance access 306.3, exhaust discharge 501.3.1, dryer exhaust 504.9.4.1) using the 2021 IMC. Which edition applies depends on your state, city and exam: check your own bulletin. Questions are original, not real exam questions. Independent guide, not affiliated with the International Code Council or IAPMO. International Mechanical Code and ICC are trademarks of the International Code Council.

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Chapters
0:00 The Short Answer
1:13 What the I M C Is
2:01 Editions and Adoption
3:00 IMC vs. UMC, IRC and IFGC
4:12 The Chapter Map, One to Eight
5:26 The Chapter Map, Nine to Fifteen
5:59 Which Exams Use It
7:06 Open Book Habits
7:52 Sample Questions One and Two
9:00 Sample Questions Three and Four
10:04 Your Recap

Exam facts are from the official International Code Council pages as of 2026-10-20. Fees and rules can change, so confirm on the official site before you enroll. Open Exam Hub is an independent study resource, not affiliated with the International Code Council. Practice questions are not from a real exam. Narration is an AI-generated voice.

Music
"Reminiscing" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons.org/licenses/by/4.0

"Fresh Air" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons.org/licenses/by/4.0

"Carefree" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons.org/licenses/by/4.0

Sound effects: Kenney (kenney.nl), CC0.

Images
"Air duct pipes at Viborg Katedralskole" by W.carter, Public domain, via Wikimedia Commons commons.wikimedia.org/wiki/File:Air_duct_pipes_at_Viborg_Katedralskole.jpg
"012 Rooftop HVAC systems and roof ventilation ducts in Tokyo, Japan" by Marek Ślusarczyk (Tupungato), CC BY 3.0, via Wikimedia Commons commons.wikimedia.org/wiki/File:012_Rooftop_HVAC_systems_and_roof_ventilation_ducts_in_Tokyo,_Japan.jpg
"Teknisk rom (School build. Lilleh. Norway 2024-09. Mechan. room Air ventil. Hot water Heat recov. unit) ..." by Wolfmann, CC BY-SA 4.0, via Wikimedia Commons commons.wikimedia.org/wiki/File:Teknisk_rom_(School_build._Lilleh._Norway_2024-09._Mechan._room_Air_ventil._Hot_water_Heat_recov._unit)_Hovedfordeler_Varmeanlegg_Ventilasjon_Isolerte_r%C3%B8r_kanaler_varmtvannsbereder_aggregat_vifte_el-tavle_stige_elkabler_vask_lagring_e.jpg

#IMC #HVAC #ICC