ICC G29 Master Mechanical Exam (2018 IMC/IFGC) Practice Exam
Free Practice Exam
Test your knowledge with 10 questions from our pool of 20 free questions.
- 10 questions per attempt
- 30 minute time limit
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Full Practice Exam
Complete exam simulation matching the real Pearson VUE test format.
- 100 questions (same as real exam)
- 240 minute time limit
- 7 topic areas covered
- 422 questions in pool
- Detailed explanations
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ICC G29 Master Mechanical (2018 IMC/IFGC) Practice Exam Guide
What's on the exam
Questions per topic, out of 100This practice exam follows the official content outline for the ICC G29 Master Mechanical (2018 IMC/IFGC) exam: Administration General Regulations, Appliances & Mechanical Equipment, Exhaust and Ventilation Systems, Duct Systems, Combustion Air, Chimneys and Vents, Fuel Supply Systems.
You have two ways to practice. The free practice exam gives you 10 questions per attempt, and you can retake it as often as you like. The full practice exam gives you 100 questions on a 4 hours clock, with a new draw from our question bank every attempt.
Administration General Regulations 30 items
Our study plan for this topic: General Installation Requirements; Code Definitions and Terms; Plan Reading; Testing; Permits and Permit Applications; Code Official Authority and Enforcement; Inspections and Inspection Procedures; Violations, Stop Work Orders, and Penalties.
Appliances & Mechanical Equipment 27 items
Our study plan for this topic: Heating Equipment & Gen App Installation; Water Heaters and Boilers; Cooling and Refrigeration Systems; Hydronic and Other Systems; Refrigerant Classification and Safety Groups (ASHRAE 34 toxicity/flammability designations); Machinery Room Requirements (construction, ventilation rates, refrigerant detectors, emergency controls); Refrigerant Piping Materials, Joints, and Installation Restrictions; Maximum Allowable Refrigerant Quantities by Occupancy Type.
Exhaust and Ventilation Systems 11 items
Our study plan for this topic: Exhaust Fan & Product Conveying Systems; Commercial Hoods & Kitchen Ventilation; Clothes Dryer Exhaust Systems; Domestic Cooking Exhaust Equipment; Hazardous Exhaust Systems; Smoke Control Systems; Exhaust Discharge Location & Outlet Termination Requirements; Mechanical Ventilation Rates & Outdoor Air Requirements.
Duct Systems 12 items
Our study plan for this topic: Duct Construction, Installation & Plenums; Smoke and Fire Dampers; Return Air Openings and Restrictions; Duct Insulation, Coverings, and Vapor Retarders; Flexible Ducts and Air Connectors; Duct Joints, Seams, and Sealing Requirements; Smoke Detection Systems Control for Air Distribution; Air Filters in HVAC Systems.
Combustion Air 6 items
Our study plan for this topic: Venting of Fuel Burning Appliances; Indoor combustion air requirements — standard method (50 cubic feet per 1,000 Btu/h); Known air-infiltration-rate method for determining required volume (Equations 3-1 and 3-2); Outdoor combustion air — two-permanent-openings and one-permanent-opening methods with sizing criteria; Combination indoor and outdoor combustion air method; Mechanical combustion air supply systems and appliance interlock requirements; Louvers, grilles, and screens — net free area calculations and motorized louver interlocks; Combustion air duct construction, installation, and termination requirements.
Chimneys and Vents 8 items
Our study plan for this topic: Venting of Fuel Burning Appliances; Chimney and Vent Connectors; Appliance categories and vent system type selection (Table 503.4/802.2); Vent and chimney termination height and location requirements; Sizing of Category I appliance venting systems using code tables; Masonry chimney construction, lining, and flue requirements; Factory-built chimney listing, installation, and clearance requirements; Draft hoods, draft controls, and vent dampers.
Fuel Supply Systems 6 items
Our study plan for this topic: Fuel Supply Installation, Testing and Sizing; Piping materials, fittings, and joint types for gas systems; CSST bonding and electrical continuity requirements; Pressure regulators, shutoff valves, and flow controls; Piping support intervals and protection against physical damage; Prohibited locations and underground installation requirements for gas piping; Purging procedures and leak detection methods; Fuel oil piping materials, joints, valves, and system installation.
Sample 1 — Administration General Regulations
Question: Which device is defined as one responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance?
- A. Limit control
- B. Automatic vent damper device
- C. Flame safeguard
- D. Interlock
Correct Answer: A
IMC 2018, Section 202, defines LIMIT CONTROL as 'a device responsive to changes in pressure, temperature or level for turning on, shutting off or throttling the gas supply to an appliance.' A flame safeguard shuts off fuel when the means of ignition becomes inoperative or flame failure occurs; an interlock governs succeeding operations of associated devices; an automatic vent damper device opens and closes the venting system as the appliance cycles.
Reference: IMC 2018 Section 202 — Limit Control
Sample 2 — Appliances & Mechanical Equipment
Question: You are conducting a safety inspection of an existing forced-air furnace. With the furnace operating, you want to check for heat exchanger leaks. Which method does the inspection procedure recommend?
- A. Perform a static pressure test on the vent connector
- B. Measure the temperature differential across the supply and return plenums
- C. Check for flame disturbance before and after the blower comes on
- D. Introduce tracer gas into the flue and sample at the supply register
Correct Answer: C
Per IFGC Appendix D, Section D.6(1)(e), the inspector should check for flame disturbance before and after the blower comes on, which can indicate heat exchanger leaks. This is a practical operating test listed in the appliance-specific inspection procedures for forced-air furnaces.
Reference: IFGC 2018 Appendix D, Section D.6(1)(e)
Sample 3 — Duct Systems
Question: You are locating a return air opening for a forced-air system in a large open space that also contains an appliance equipped with a draft hood. Measured in any direction from that draft hood, the return air opening shall not be located less than:
- A. 3 feet
- B. 15 feet
- C. 6 feet
- D. 10 feet
Correct Answer: D
IMC 2018 Section 601.5, Item 1 requires that return air openings be located not less than 10 feet, measured in any direction, from an open combustion chamber or draft hood of another appliance located in the same room or space. The same 10-foot separation is used in the exception permitting return air from a kitchen relative to cooking appliances.
Reference: IMC 2018 Chapter 6 — Section 601.5 Return air openings
Treat your first attempt as a checkup, not a verdict. After every attempt, the results page breaks your score down by outline topic, so you can see which topics need work. Compare your score with the real exam's passing score, 70% correct, and keep practicing until you pass consistently.
- Answer what you know first. Go through every question once, answer the ones you know, and bookmark the rest. Our practice exams let you bookmark and come back.
- Come back to your bookmarks. Work them out on your second pass.
- Watch your pace. The real exam works out to about 2 minutes 24 seconds per question.
- Look up every miss. After each attempt, find each missed question's reference in your book and read the section.
| Questions | 100 questions |
| Time limit | 4 hours |
| Passing score | 70% correct |
| Books in the exam room | Open book |
| Exam fee | $120 |
- Results for examinations taken electronically are available immediately after the examination is completed.
- You must wait 10 days before retaking a failed exam.
Source: National Contractor/Trades Examination Information Bulletin, PUBLISHED June 30, 2026; ICC Exam Catalog, checked October 6, 2026. Check the bulletin before test day: fees and rules can change.