Free ICC Master Mechanical Practice Test

10 questions. Roughly 4 minutes. No email, no card, no signup. Score yourself instantly with explanations for every answer.

Pulled from the same verified question bank used by Master Mechanical Buddy members. Covers gas piping, combustion air and venting, refrigerants, ventilation, bonding, and the International Mechanical Code.

Practice test
10 questions. About 4 minutes. No signup.
  • One question at a time, multiple choice.
  • You will see the correct answer and a brief explanation only at the end.
  • Questions are pulled at random from our verified bank.
  • Nothing is saved. Nothing is sent. Refresh to start over.

What is on the ICC Master Mechanical exam?

The ICC Master Mechanical Contractor exam is an open-book, timed exam built around the International Mechanical Code, the International Fuel Gas Code, and the standards those codes reference. The eight categories below mirror the practice content inside Master Mechanical Buddy. The actual exam blueprint is published by the ICC in the current examination catalog.

Appliances & Connections
Gas appliance shutoffs, sediment traps, flexible connectors, dryer vent rules.
Bonding & Grounding
EGC sizing, CSST bonding, equipment grounding for HVAC enclosures.
Combustion Air & Venting
Indoor/outdoor combustion-air openings, Category I–IV venting, vent termination clearances.
Gas Piping & Pressure Testing
Pipe sizing tables, threaded vs. CSST, pressure-test durations and acceptance criteria.
Refrigerants & Safety
ASHRAE 34 safety groups, A2L charge limits, recovery and leak-detection rules.
Ventilation & IAQ
ASHRAE 62.1/62.2 ventilation calculations, exhaust hoods, makeup air.
Hydronics & Boilers
Expansion tanks, relief valves, low-water cutoffs, boiler clearances.
Ductwork & Sealing
SMACNA pressure classes, sealing classes, supports, plenum returns.

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Practice test — frequently asked questions

Is this practice test really free?
Yes. The 10-question practice test runs entirely in your browser. No email, no card, no signup. If you want the full 200+ question bank, you can create a free account at /start — still no card.
Are these real ICC Master Mechanical exam questions?
No. We are not affiliated with the International Code Council (ICC), and these are not actual exam questions. They are original practice questions written and reviewed against the published exam content outline, the International Mechanical Code, the International Fuel Gas Code, ASHRAE 62.1, and other referenced standards.
How long is the actual ICC Master Mechanical exam?
The ICC Master Mechanical Contractor exam is an open-book, timed exam covering the International Mechanical Code, the International Fuel Gas Code, and related referenced standards. See the current ICC examination catalog for the official question count, time limit, and passing score, which the ICC updates periodically.
What topics are on the exam?
The exam covers gas piping and appliance connections, combustion air and venting, refrigerants, ventilation, hydronics and boilers, ductwork, bonding and grounding for HVAC equipment, and code administration. The 8 sections on this page mirror the practice content categories in Master Mechanical Buddy.
What is the passing score?
The passing score for ICC contractor exams is published in the official ICC examination catalog and can vary by exam version. Most contractor exams require a 70% or higher to pass. Confirm the current requirement with the ICC and with your state or local licensing authority before testing.
Will this practice test work on my phone?
Yes. The page is mobile-first and the quiz runs in any modern browser. No app install required.