ICC G33 Master Gas Pipe Fitter Exam (2018 IFGC) Practice Exam
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- 180 minute time limit
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ICC G33 Master Gas Pipe Fitter (2018 IFGC) Practice Exam Guide
What's on the exam
Questions per topic, out of 75This practice exam follows the official content outline for the ICC G33 Master Gas Pipe Fitter (2018 IFGC) exam: General Requirements, Water Heaters, Appliances and Equipment, Fuel Supply System Sizing, Combustion Air, Chimneys and Vents.
- Free practice exam: 10 questions per attempt, retake as often as you like.
- Full practice exam: 75 questions on a 3 hours clock, a new draw from our bank every attempt.
General Requirements 37 items
Our study plan for this topic: General Installation Requirements; Code Definitions and Terms; Plan Reading; Testing; Materials; Appliance Listing and Labeling Requirements; Permits and Permit Application Procedures; Inspection Types and Procedures.
Water Heaters 4 items
Our study plan for this topic: Installation of Water Heaters; Testing and listing standards for water heaters (ANSI Z21.10.1/CSA 4.1 and ANSI Z21.10.3/CSA 4.3); Water heaters used for combined potable water and space heating applications.
Appliances and Equipment 11 items
Our study plan for this topic: Requirements for Specific Appliances & Equipment; Clothes dryer exhaust duct installation and length limitations; Unvented room heater restrictions and oxygen-depletion safety systems; Vented wall furnace and floor furnace placement and clearance requirements; Cooking appliance clearances and prohibited locations; Water heater installation and dual-use (space heating) requirements; Gas-fired air-conditioning appliance clearances and refrigeration coil installation; Direct-fired industrial air heater (recirculating and nonrecirculating) location and air supply requirements.
Fuel Supply System Sizing 4 items
Our study plan for this topic: Service Distribution Pipe Sizing; Maximum gas demand calculation and total connected load; Allowable pressure drop and minimum appliance supply pressure; Sizing methods: longest length, branch length, and hybrid pressure; Low-pressure and high-pressure sizing tables for natural gas and LP-gas; Pipe sizing for CSST using equivalent hydraulic diameter (EHD); Gravity factor adjustments for specific gravity other than 0.60; Equivalent length allowances for fittings and valves.
Combustion Air 10 items
Our study plan for this topic: Combustion Air Source, Size of Ducts/Openings; Indoor combustion air volume requirements (standard method and known air-infiltration-rate method); Combining indoor spaces for combustion air (same story and different stories); Outdoor combustion air methods (two-permanent-openings and one-permanent-opening); Combination indoor and outdoor combustion air calculations; Mechanical combustion air supply requirements and appliance interlock; Louvers, grilles, and screens — net free area calculations and motorized louver interlock; Combustion air duct installation requirements.
Chimneys and Vents 9 items
Our study plan for this topic: Venting, Vent Connector, and Chimneys; Appliance venting categories and vent type selection (Table 503.4); Vent and chimney termination location requirements; Vent connector materials, sizing, slope, and clearances; Sizing of Category I appliance venting systems using Tables 504.2 and 504.3; Gas vent types (Type B, B-W, L) construction and installation requirements; Single-wall metal pipe vent requirements and limitations; Draft hoods, draft controls, and vent dampers.
Sample 1 — General Requirements
Question: When combining indoor spaces on the same story to meet combustion air volume requirements, each opening connecting the spaces must have a minimum free area of 1 square inch per 1,000 Btu/h of total input rating, but in no case less than what minimum area?
- A. 50 square inches
- B. 100 square inches
- C. 150 square inches
- D. 75 square inches
Correct Answer: B
Per IFGC Section 304.5.3.1, when combining spaces on the same story for combustion air, each opening shall have a minimum free area of 1 square inch per 1,000 Btu/h of the total input rating of all appliances in the space, but not less than 100 square inches.
Reference: IFGC 2018 Section 304.5.3.1
Sample 2 — Appliances and Equipment
Question: A domestic clothes dryer transition duct used to connect the dryer to the exhaust duct system shall not exceed what maximum length?
- A. 4 feet
- B. 12 feet
- C. 6 feet
- D. 8 feet
Correct Answer: D
Per IFGC Section 614.8.3, transition ducts used to connect the dryer to the exhaust duct system shall be a single length listed and labeled in accordance with UL 2158A, shall be not more than 8 feet in length, and shall not be concealed within construction.
Reference: IFGC 2018 Section 614.8.3
Sample 3 — Combustion Air
Question: When using the Longest Length Method to size a residential gas piping system, what single measurement is used to determine the pipe size for EVERY section of the system?
- A. The length of each individual branch segment being sized
- B. The total combined length of all pipe segments in the system
- C. The length from the regulator to the nearest connected appliance
- D. The length from the point of delivery to the most remote outlet
Correct Answer: D
Per IFGC Appendix A, Section A.3.1, Step (4): 'Determine the length of piping from the point of delivery to the most remote outlet in the building/piping system.' Step (5) then states: 'This is the only length used in determining the size of any section of gas piping.' This single longest length is applied to every segment in the system, making the method conservative.
Reference: IFGC 2018 Appendix A, Section A.3.1
- Your results break the score down by outline topic.
- The real exam's passing score: 70% correct.
- Keep practicing until you pass consistently, not just once.
- Answer what you know first and bookmark the rest. Our practice exams let you bookmark and come back.
- Work your bookmarks on the second pass.
- Real exam pace: about 2 minutes 24 seconds per question.
- After each attempt, look up every miss in your book.
| Questions | 75 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.