Denver Master Gas Pipe Fitter Exam (ICC F33, 2015 IFGC) Practice Exam
ICC is retiring this exam. From December 1, 2026 it is no longer available for registration through Pearson VUE (ICC Exam Catalog, checked October 21, 2026). Check the ICC Exam Catalog or your licensing jurisdiction for the exam that replaces it.
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- 75 questions (same as real exam)
- 180 minute time limit
- 6 topic areas covered
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Denver Master Gas Pipe Fitter (ICC F33, 2015 IFGC) Practice Exam Guide
What's on the exam
Questions per topic, out of 75This practice exam follows the official content outline for the Denver Master Gas Pipe Fitter (ICC F33, 2015 IFGC) exam: General Requirements, Appliances and Equipment, Fuel Supply Systems, Combustion Air, Chimneys and Vents, Special Requirements.
- 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 29 items
Our study plan for this topic: Code scope and applicability (fuel gas piping systems, appliances, and excluded installations); Permits, inspections, and approval process; Key definitions (point of delivery, piping system, appliance, regulator, CSST, LP-gas, etc.); Piping identification, labeling, and manufacturer marking requirements; Appliance listing, labeling, and installation requirements; Structural safety and protection of building members during piping installation; Prohibited locations for appliances and piping; Electrical bonding and grounding requirements for gas piping systems.
Appliances and Equipment 10 items
Our study plan for this topic: Appliance listing, labeling, and approval requirements; Prohibited and restricted appliance locations; Clearances to combustible construction and clearance reduction methods; Access and service space requirements for appliances; Specific appliance installation requirements (furnaces, boilers, water heaters, unit heaters, unvented room heaters, clothes dryers, cooking appliances); Elevation of ignition sources in garages and hazardous locations; Condensate disposal for fuel-burning and cooling appliances; General Regulations.
Fuel Supply Systems 13 items
Our study plan for this topic: Gas pipe sizing methods (longest length, branch length, and hybrid pressure methods); Pipe sizing table selection based on gas type, inlet pressure, and allowable pressure drop; Altitude adjustment for gas demand above 2,000 feet elevation; Approved piping and tubing materials (steel, copper, CSST, polyethylene, aluminum alloy); Piping installation requirements (burial depth, prohibited locations, underground penetrations, protection from physical damage); Pressure testing and purging procedures for gas piping systems; Shutoff valve requirements (location, appliance shutoff, meter valve, multiple-meter systems); Pressure regulators and overpressure protection devices.
Combustion Air 9 items
Our study plan for this topic: Indoor combustion air volume requirements (standard method and known air-infiltration-rate method); Outdoor combustion air openings: two-permanent-openings method sizing and placement; Outdoor combustion air openings: one-permanent-opening method sizing and placement; Combination indoor and outdoor combustion air sizing calculations; Mechanical combustion air supply systems and appliance interlock requirements; Louvers, grilles, and screens: free area calculations and motorized louver interlock requirements; Combustion air duct construction, installation, and termination requirements; Protection from corrosive or flammable fumes affecting combustion air supply.
Chimneys and Vents 10 items
Our study plan for this topic: Appliance venting categories and vent type selection (Types B, BW, L, single-wall metal, special gas vent); Venting system sizing using Section 504 tables for Category I appliances (single and multiple appliances); Vent and chimney termination requirements (height, location, clearances from openings and inlets); Vent connector materials, construction, clearances, slope, and length limitations; Masonry chimney requirements (lining, cleanouts, inspection, and connection rules); Draft hoods and draft controls (installation, location, clearance, and prohibited dampers); Appliances not required to be vented and aggregate input rating limits for unvented appliances; Mechanical draft systems, positive-pressure venting, and direct-vent appliance installation requirements.
Special Requirements 4 items
Our study plan for this topic: Installation requirements for specific appliance types (fireplaces, furnaces, heaters, dryers, boilers); Clearances to combustible materials for specific appliances; Flame safeguard and safety shutoff device requirements; Prohibited locations and occupancy restrictions for specific appliances; Clothes dryer exhaust duct sizing, materials, and length limitations; Unvented room heater input rating limits and oxygen-depletion safety systems; Gaseous hydrogen system piping design, materials, and identification requirements; Pressure testing and purging procedures for gaseous hydrogen piping systems.
Sample 1 — General Requirements
Question: Under the code's appliance type classifications, a medium-heat appliance is one in which the products of combustion at the point of entrance to the flue, under normal operating conditions, have a temperature greater than 1,000°F but not greater than what value?
- A. 2,000°F
- B. 1,500°F
- C. 2,500°F
- D. 1,200°F
Correct Answer: A
IFGC 2015, Section 202, under 'Appliance Type,' defines a medium-heat appliance as one in which flue-entrance combustion products exceed 1,000°F (538°C) but are not greater than 2,000°F (1093°C). At or below 1,000°F the appliance is a low-heat (residential) appliance.
Reference: IFGC 2015 Section 202 (definition of 'Appliance Type')
Sample 2 — Fuel Supply Systems
Question: In a commercial kitchen, appliance shutoff valves are grouped at a manifold rather than within 6 feet of each appliance. The valves are readily accessible and permanently identified, and the piping from the manifold to within 6 feet of each appliance is sized and installed as part of the piping system. What is the maximum distance permitted between the manifold shutoff valve and the appliance it serves?
- A. 6 feet
- B. 50 feet
- C. 20 feet
- D. 75 feet
Correct Answer: B
IFGC 2015 Section 409.5.3 permits the appliance shutoff valve to be installed at a manifold provided it is located within 50 feet (15 240 mm) of the appliance served, is readily accessible and permanently identified.
Reference: IFGC 2015 Section 409.5.3
Sample 3 — Appliances and Equipment
Question: You are supervising the replacement of a floor furnace in a dwelling where the grade beneath the unit does not allow the required clearance. The ground below and to the sides is excavated to form a pit under the furnace. What is the minimum clearance required between the walls of that pit and the control side of the furnace?
- A. 18 inches
- B. 24 inches
- C. 6 inches
- D. 12 inches
Correct Answer: A
Per IFGC 2015, Section 609.4, where the required clearance from grade cannot be provided, the ground must be excavated to form a pit. A 12-inch minimum clearance is required on all sides except the control side, which must have an 18-inch minimum clearance. The 6-inch figure is the required clearance from grade to the lowest portion of the furnace (2 inches where the lower portion is factory-sealed against water entry).
Reference: IFGC 2015 Section 609.4
- Your results break the score down by outline topic.
- The real exam's passing score: a minimum score of 70.
- 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 | a minimum score of 70 |
| Books in the exam room | Open book |
| Exam fee | $115 |
- Results for electronically administered examinations are available immediately after the exam is completed.
- You must wait 10 days before retaking a failed exam.
Source: Denver, Colorado Contractor/Trades Examination Information Bulletin, Published June 3, 2026 (page headers read "August 19, 2025"). Check the bulletin before test day: fees and rules can change.