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General Administration — ICC M1 Practice Questions

12 questions · 10% of the ICC M1 exam

Worked questions

1. During a Carrier 59SC6A furnace inspection, the installer treats the front combustion-air clearance as also providing service access. In Table 2 of its installation instructions, what front space is identified for service, subject to local building codes?

  • A1 inch
  • 24 inches
  • C0 inches
  • D12 inches

Where to look it up

https://www.shareddocs.com/hvac/docs/1009/Public/0A/59SC6A-01SI.pdf

Why B is correct

Table 2 distinguishes service access (24 inches) from the front combustion-air clearance (1 inch). Different purposes require different checks; these dimensions are specific to this furnace manual. Source: https://www.shareddocs.com/hvac/docs/1009/Public/0A/59SC6A-01SI.pdf

2. Which statement correctly describes the heat source in a residential forced-air heating system?

  • AIt must be a gas-fired water heater
  • BIt must include central air conditioning to provide heat
  • CIt must be a gas-fired boiler
  • Forced air describes heat distribution and does not by itself require a direct-vent gas furnace

Where to look it up

https://www.energy.gov/sites/default/files/2013/11/f5/hvac_guide.pdf

Why D is correct

Forced-air heating moves heated air through an air-distribution system. It does not specify a single fuel or appliance: an electric furnace is one example that uses forced-air distribution without gas combustion. The actual equipment and installation must meet their applicable requirements; the distribution label alone does not establish a gas-furnace mandate. Source: https://www.energy.gov/sites/default/files/2013/11/f5/hvac_guide.pdf

3. An inspector applies the 2024 IRC to a new oil-fired, cast-iron sectional hot-water boiler. It is not a coil-type or water-tube-type boiler. Which control must automatically stop combustion if the water level falls below the manufacturer’s lowest safe level?

  • AA room thermostat alone
  • BA manual fuel shutoff valve alone
  • A low-water cutoff control
  • DA pressure-relief valve alone

Where to look it up

https://dos.ny.gov/nys-residential-code-noa-7242025

Why C is correct

The low-water cutoff provides this automatic shutdown. The forced-circulation coil/water-tube exception does not apply to the specified sectional boiler. A thermostat, manual valve or pressure-relief valve alone does not perform the required low-water shutdown. The earlier M1503.2 citation concerned cooking exhaust, not this boiler control. Source: 2024 IRC M2002.5 and M2002.6, reproduced without a substantive New York modifier in the official 2025 RCNYS (2024 IRC base). https://dos.ny.gov/nys-residential-code-noa-7242025

4. An inspector sizes a Type B double-wall gas vent connected directly to one natural-draft, draft-hood-equipped Category I furnace with a fixed 100,000 Btu/h input and a 4-inch draft-hood outlet. Total vent height H is 15 feet and lateral length L is 5 feet, with the two 90-degree elbows included in the table configuration. The vent is inside the building below the roof, with no damper, other obstruction or additional capacity adjustment. Using 2024 IRC Table G2428.2(1), what is the smallest listed diameter that has sufficient NAT Max capacity?

  • A3 inches
  • B4 inches
  • 5 inches
  • D6 inches

Where to look it up

https://dos.ny.gov/nys-residential-code-noa-7242025

Why C is correct

For H = 15 feet and L = 5 feet, NAT Max capacities are 45,000 Btu/h at 3 inches, 87,000 at 4 inches, 142,000 at 5 inches and 217,000 at 6 inches. The 100,000 Btu/h furnace therefore needs at least the 5-inch option. The 4-inch FAN Max value is not the applicable natural-draft capacity. Vent diameter depends on the appliance and configuration, not a universal 10-inch minimum. Source: 2024 IRC G2428.1, Table G2428.2(1) and G2428.2.1 through G2428.2.17, reproduced without a substantive state modifier in the official 2025 RCNYS (2024 IRC base). https://dos.ny.gov/nys-residential-code-noa-7242025

5. An existing house has a gas furnace with a 100,000 Btu/h input rating. All combustion air for the appliance space is supplied mechanically from outdoors under 2024 IRC G2407.9; there are no other appliances or exhaust-air makeup loads in that space. What is the minimum required combustion-air supply rate?

  • 35 cubic feet per minute
  • B100 cubic feet per minute
  • C150 cubic feet per minute
  • D250 cubic feet per minute

Where to look it up

https://dos.ny.gov/nys-residential-code-noa-7242025

Why A is correct

The mechanical method requires at least 0.35 cfm per 1,000 Btu/h of total appliance input. The required rate is (100,000 / 1,000) × 0.35 = 35 cfm. This is an airflow rate, not an indoor-room volume or a universal cubic-feet-per-hour allowance. The burner interlock and other installation requirements still apply. Source: 2024 IRC G2407.9, reproduced without a substantive state modifier in the official 2025 RCNYS (2024 IRC base). https://dos.ny.gov/nys-residential-code-noa-7242025

6. Under 2024 IRC Table M1505.5, what minimum local exhaust capacity applies to a bathroom fan operating intermittently?

  • 50 cubic feet per minute
  • B75 cubic feet per minute
  • C100 cubic feet per minute
  • D125 cubic feet per minute

Where to look it up

https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

Why A is correct

Use the bathroom row and intermittent mode in Table M1505.5: 50 cfm. Continuous operation has a different rate; 100 cfm is the kitchen intermittent entry. Source: https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

7. During the inspection of an existing home, the inspector notices that the bathroom exhaust fan is not venting properly. Which of the following actions should the inspector take?

  • ARecommend the replacement of the exhaust fan with a higher CFM model.
  • Inspect the vent pipe for obstructions or leaks.
  • CInstall a carbon monoxide detector in the bathroom.
  • DAdvise the homeowner to run the fan for longer periods.

Where to look it up

https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

Why B is correct

An obstructed or leaking exhaust path is a sensible condition to investigate before choosing a repair. This is a diagnostic reasoning scenario, not a quoted requirement that this specific diagnosis is mandated by IRC M1503.3. Actual inspection and work must follow the applicable exhaust provisions and equipment instructions.

8. Use the 30-foot row in Carrier 59SC6A installation Table 10 for a gas-pipe sizing exercise: nominal 1/2-inch pipe carries 95 ft³/h and 3/4-inch pipe carries 199 ft³/h. The exercise demand is 120 ft³/h. Assume the table conditions apply: natural gas specific gravity 0.60, pressure no greater than 0.5 psig, and 0.5-inch-water-column pressure drop. Which listed pipe is the smallest that meets the demand?

  • A1/2 inch, because the run is under 100 feet
  • BNeither pipe can serve a 30-foot run
  • 3/4 inch
  • DBoth sizes have equal capacity

Where to look it up

https://www.shareddocs.com/hvac/docs/1009/Public/0A/59SC6A-01SI.pdf

Why C is correct

The 1/2-inch capacity of 95 ft³/h is below 120; the 3/4-inch capacity of 199 exceeds it. Pipe selection depends on the table conditions and demand, not a universal meter-distance maximum. Source: https://www.shareddocs.com/hvac/docs/1009/Public/0A/59SC6A-01SI.pdf

4 more in the bank

Answers and explanations for these are in the app.

  • An inspector is conducting a routine inspection on a residential property. Which of the following is the minimum required ventilation rate for a bathroom, according to the 2024 IRC?
  • An inspector is reviewing the drawings for a new commercial building and notices that the fire alarm system does not comply with the requirements of the 2024 International Residential Code (IRC). Which of the following actions should the inspector take?
  • An inspector is reviewing the installation of a new heating appliance. Which of the following is a requirement for the clearance between the appliance and combustible materials, according to the 2024 IRC?
  • Which of the following is the correct method for testing fuel gas piping for leaks, as per the 2024 International Residential Code?

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