ICC F33 Master Gas Pipe Fitter Exam (2015 IFGC) Practice Exam
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Complete exam simulation matching the real Pearson VUE test format.
- 75 questions (same as real exam)
- 180 minute time limit
- 6 topic areas covered
- 340 questions in pool
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ICC F33 Master Gas Pipe Fitter (2015 IFGC) Practice Exam Guide
What's on the exam
Questions per topic, out of 75This practice exam is built around the official content outline for the ICC F33 Master Gas Pipe Fitter (2015 IFGC) exam: General Requirements, Water Heaters, Appliances and Equipment, Fuel Supply System Sizing, Combustion Air, Chimneys and Vents.
There are two ways to practice. The free practice exam gives you 10 questions per attempt, and you can take it as many times as you like. The full practice exam gives you 75 questions on a 3 hours clock, with a new draw from our question bank each time.
General Requirements 37 items
Our study plan for this topic: General Installation Requirements; Code Definitions and Terms; Plan Reading; Testing; Materials; Appliance listing, labeling, and approval requirements; Prohibited and restricted appliance locations; Clearances to combustible construction and reduction methods.
Water Heaters 4 items
Our study plan for this topic: Installation of Water Heaters; Water heaters used for combined space heating and potable hot water applications; Testing standards for water heaters (ANSI Z21.10.1 and ANSI Z21.10.3); Water heater location: prohibited rooms and garage ignition-source elevation; Water heater gas shutoff valve; Water heater venting.
Appliances and Equipment 11 items
Our study plan for this topic: Requirements for Specific Appliances & Equipment; Clearance requirements for specific appliances; Clothes dryer exhaust duct installation and length limits; Unvented room heater restrictions and oxygen-depletion safety systems; Vented wall furnace and floor furnace placement and access requirements; Forced-air warm-air furnace return air prohibited sources and duct sizing; Appliance listing standards and testing references (ANSI, NFPA, UL); Sauna heater location, combustion air, and heat/time controls.
Fuel Supply System Sizing 4 items
Our study plan for this topic: Service and Distribution Pipe Sizing; Maximum Gas Demand Calculation; Allowable Pressure Drop and Minimum Supply Pressure; Pipe Length Determination Methods (Longest Length, Branch Length, Hybrid Pressure); Low-Pressure vs. High-Pressure Sizing Equations and Table Selection; Altitude Adjustment for Gas Flow above 2,000 Feet; Maximum Design Operating Pressure Limits and Exceptions; Sizing for Additional Appliances and System Modifications.
Combustion Air 10 items
Our study plan for this topic: Combustion Air Source, Size of Duct/Openings; Indoor Combustion Air Volume Requirements (Standard and Known ACH Methods); Combining Indoor Spaces for Combustion Air (Same Story and Different Stories); Outdoor Combustion Air Methods (Two-Opening and One-Opening); Combination Indoor and Outdoor Combustion Air; Mechanical Combustion Air Supply Requirements and Appliance Interlock; Louvers, Grilles, and Screens (Net Free Area Calculations); Combustion Air Duct Construction and 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 (Types B, BW, L, single-wall metal); Vent and chimney termination requirements and clearances; Sizing of Category I appliance venting systems using IFGC tables; Vent connector materials, installation, slope, length, and clearance requirements; Draft hoods, draft controls, and barometric draft regulators; Appliances not required to be vented and aggregate input rating limits; Gas vent termination locations relative to forced-air inlets, doors, and building openings.
Sample 1 — General Requirements
Question: In a fuel gas piping system, full-face flange gaskets are required to be used with which flanges?
- A. Lapped steel flanges
- B. Forged steel flanges
- C. Nonsteel flanges
- D. Raised-face steel flanges
Correct Answer: C
IFGC 2015, Section 403.13 lists acceptable gasket materials and states that full-face flange gaskets shall be used with all nonsteel flanges. The same section also requires replacement of the gasket whenever a flanged joint is opened.
Reference: IFGC 2015 Section 403.13
Sample 2 — Appliances and Equipment
Question: A duct furnace is being installed in a commercial air-handling system. Removable access panels are required in the connected ductwork at which location(s)?
- A. Upstream side of the furnace
- B. Upstream and downstream sides of the furnace
- C. Return air plenum and draft hood enclosure
- D. Downstream side of the furnace
Correct Answer: B
Per 2015 IFGC Section 610.2, ducts connected to duct furnaces shall have removable access panels on both the upstream and downstream sides of the furnace.
Reference: IFGC 2015 Section 610.2
Sample 3 — Combustion Air
Question: As the master gas fitter of record, you are evaluating a sealed mechanical closet that has no openings to adjoining rooms and no outdoor air openings. The closet measures 10 feet by 15 feet with an 8-foot ceiling, and all combustion air will be taken from the volume of the closet itself using the standard indoor method. What is the maximum total appliance input rating that this space can support?
- A. 12,000 Btu/h
- B. 60,000 Btu/h
- C. 24,000 Btu/h
- D. 48,000 Btu/h
Correct Answer: C
Per IFGC 304.5.1 (Standard Method), the minimum required volume is 50 cubic feet per 1,000 Btu/h of appliance input. The closet volume is 10 x 15 x 8 = 1,200 cubic feet. 1,200 cu ft ÷ 50 cu ft per 1,000 Btu/h = 24, so the space supports 24 x 1,000 = 24,000 Btu/h of total input.
Reference: IFGC 2015 Section 304.5.1
Your first score is just a starting point. After every attempt, the results page shows how you did on each outline topic, so you can see what to work on next. Compare your score with the real exam's passing score, 70% correct, and keep at it until you pass consistently.
- Start with the questions you know. Go through the whole exam once and bookmark anything you're unsure about. Our practice exams let you bookmark and come back.
- Circle back to your bookmarks on the second pass.
- Keep an eye on your pace. The real exam works out to about 2 minutes 24 seconds per question.
- Turn every miss into a lesson. After each attempt, look up each missed question's reference in your book and read the section.
| 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.