ICC F31 Journeyman Mechanical Exam (2015 IMC/IFGC) Practice Exam
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Full Practice Exam
Complete exam simulation matching the real Pearson VUE test format.
- 50 questions (same as real exam)
- 180 minute time limit
- 9 topic areas covered
- 207 questions in pool
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ICC F31 Journeyman Mechanical (2015 IMC/IFGC) Practice Exam Guide
What's on the exam
Questions per topic, out of 50This practice exam follows the official content outline for the ICC F31 Journeyman Mechanical (2015 IMC/IFGC) exam: General Requirements, Appliances and Equipment, Exhaust and Ventilation Systems, Duct Systems, Combustion Air, Chimneys and Vents, Fuel Supply Systems, Special Requirements, Electrical.
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 50 questions on a 3 hours clock, with a new draw from our question bank every attempt.
General Requirements 23 items
Our study plan for this topic: Permit requirements and exemptions; Code official authority and duties; Inspections and testing requirements; Appliance listing, labeling, and approval requirements; Equipment and appliance location restrictions; Access and service space requirements for appliances; Clearances to combustible construction and clearance reduction methods; Key IMC definitions and terminology.
Appliances and Equipment 7 items
Our study plan for this topic: Heating appliance installation requirements and clearances (wall furnaces, floor furnaces, unit heaters, duct furnaces); Clothes dryer exhaust duct systems (materials, length limits, termination, makeup air); Boiler installation, safety devices, and pressure relief valves; Unvented room heater restrictions (prohibited locations, oxygen-depletion shutoff, input rating limits); Forced-air warm-air furnace requirements (return air sources, duct sizing, prohibited return air locations); Cooking appliance installation (domestic vs. commercial, vertical clearances, venting); Sauna heater installation (temperature controls, combustion air, ventilation openings); Water heater and pressure vessel requirements (standards, expansion tanks, gauges, dual-use space heating).
Exhaust and Ventilation Systems 1 item
Our study plan for this topic: Exhaust discharge location and minimum separation distances; Commercial kitchen Type I and Type II hood requirements and exhaust rates; Clothes dryer exhaust duct materials, length limits, and installation requirements; Hazardous exhaust systems design and duct construction requirements; Mechanical ventilation outdoor airflow rates by occupancy classification; Makeup air requirements for exhaust systems; Smoke control system design methods and equipment requirements; Energy recovery ventilation system applications and prohibited uses.
Duct Systems 7 items
Our study plan for this topic: Duct construction materials and classification (metallic, nonmetallic, flexible); Duct joints, seams, and connection sealing requirements; Plenum construction and material flame/smoke rating requirements; Fire dampers, smoke dampers, and combination dampers — ratings, actuation, and placement; Duct insulation, vapor retarders, and surface temperature limits; Return air opening restrictions and prohibited locations; Smoke detection system controls for air distribution systems; Underground duct installation requirements.
Combustion Air 3 items
Our study plan for this topic: Indoor combustion air volume requirements (standard method and known air-infiltration-rate method); Outdoor combustion air opening methods (two-permanent-openings and one-permanent-opening); Combination indoor and outdoor combustion air sizing and calculation; Mechanical combustion air supply systems and appliance interlock requirements; Combustion air duct construction, materials, and installation requirements; Louvers, grilles, and screens — net free area calculation and motorized louver interlock; Makeup air provisions for exhaust fans and interfering equipment; Scope and applicability of combustion air methods by appliance and fuel type (IMC vs. IFGC).
Chimneys and Vents 3 items
Our study plan for this topic: Vent system types and applications (Type B, BW, L, single-wall metal pipe); Chimney and vent sizing methods for Category I appliances using sizing tables; Vent and chimney termination location requirements; Vent connector materials, construction, clearances, and installation requirements; Draft hoods, draft controls, and automatically operated vent dampers; Factory-built chimney listing, installation, and termination requirements; Flue lining systems for masonry chimneys (clay tile, listed liner systems); Appliances not required to be vented and unvented appliance input limits.
Fuel Supply Systems 1 item
Our study plan for this topic: Gas pipe sizing methods and sizing tables (longest length, branch length, hybrid pressure); Allowable pressure drop and maximum design operating pressure limits; Approved piping and tubing materials (steel, copper, CSST, polyethylene, aluminum); Piping joints, fittings, and connection requirements by material type; Piping installation requirements (prohibited locations, underground burial depth, protection from damage, support intervals); Shutoff valves, pressure regulators, and overpressure protection devices; Pressure testing, leak detection, and purging procedures for gas piping systems; Fuel oil piping materials, joints, valves, testing, and system installation requirements.
Special Requirements 3 items
Our study plan for this topic: Refrigerant classification and maximum allowable quantities per occupancy type; Machinery room general and special requirements (ventilation, emergency shutoff, refrigerant detectors); Refrigerant piping materials, joints, location restrictions, and field pressure testing; Refrigerant system classification (low-probability vs. high-probability systems); Hydronic piping materials, fittings, joints, and pressure testing requirements; Embedded piping installation and thermal barrier requirements for radiant systems; Ground-source heat pump loop system piping, joints, shutoff valves, and testing; Solar system installation requirements (pressure/temperature relief, freeze protection, heat transfer fluids, and roof-mounted collectors).
Electrical 2 items
Our study plan for this topic: Electrical wiring, controls, and connections compliance with NFPA 70; Label information requirements for electrical equipment and appliances (volts, amperes, motor phase); Electrical receptacle outlet requirements for appliances in attics and underfloor spaces; Electrical receptacle outlet requirements for equipment on roofs or elevated structures; Luminaire and switch requirements at appliance access passageway openings.
Sample 1 — General Requirements
Question: A refrigerant is assigned to flammability Class 2 where it has a lower flammability limit of more than 0.00625 pound per cubic foot at 140°F and 14.7 psia and a heat of combustion of less than:
- A. 19,000 Btu/lb
- B. 8,169 Btu/lb
- C. 1,000 Btu/lb
- D. 12,000 Btu/lb
Correct Answer: B
Per IMC 2015, Section 202, 'Flammability Classification,' Class 2 refrigerants have an LFL of more than 0.00625 lb/ft³ at 140°F and 14.7 psia and a heat of combustion of less than 8,169 Btu/lb (19 000 kJ/kg). The 19,000 figure is the metric value in kJ/kg, not Btu/lb.
Reference: IMC 2015 Section 202 (Flammability Classification — Class 2)
Sample 2 — Appliances and Equipment
Question: You are framing a laundry closet that is designed for the installation of a domestic clothes dryer. Where makeup air is provided by an opening in the closet enclosure, that opening shall have an area of not less than:
- A. 75 square inches
- B. 50 square inches
- C. 144 square inches
- D. 100 square inches
Correct Answer: D
IFGC 2015, Section 614.6 requires that where a closet is designed for installation of a clothes dryer, an opening of not less than 100 square inches for makeup air be provided in the closet enclosure, or makeup air be provided by other approved means. The same section requires makeup air for installations exhausting more than 200 cfm.
Reference: IFGC 2015 Section 614.6
Sample 3 — Duct Systems
Question: A journeyman is assembling round metal duct using crimp joints. Each crimp joint must be lapped not less than what distance, with the male end extending into the adjoining duct in the direction of airflow?
- A. 1/2 inch
- B. 2 inches
- C. 1 1/2 inches
- D. 1 inch
Correct Answer: D
Per 2015 IMC Section 603.4.2, crimp joints for round and oval metal ducts shall be lapped not less than 1 inch (25 mm), and the male end of the duct shall extend into the adjoining duct in the direction of airflow.
Reference: IMC 2015 Section 603.4.2
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 3 minutes 36 seconds per question.
- Look up every miss. After each attempt, find each missed question's reference in your book and read the section.
| Questions | 50 questions |
| Time limit | 3 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.