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2024 International Residential Code (IRC)
Chapter 24 Fuel Gas

Quiz: 2024 International Residential Code (IRC) Chapter 24 Fuel Gas

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1. Which of the following fuel gas installations is NOT covered by this chapter of the IRC?

Fuel gas piping systems for a new dwelling.
Liquefied natural gas (LNG) installations.
Venting systems for fuel-gas appliances.
Combustion air configurations for one-family dwellings.

2. What is the minimum melting point required for a nonferrous filler metal used in brazing a gas piping joint?

800°F (427°C)
1,000°F (538°C)
1,200°F (649°C)
900°F (482°C)

3. Which type of boiler operates at a steam pressure not exceeding 15 psig (100 kPa gauge)?

Hot water heating boiler
Hot water supply boiler
Steam heating boiler
High-pressure boiler

4. What distinguishes a 'direct-vent appliance' from other vented appliances?

It can discharge flue gases into the living space.
It uses a power burner for combustion.
All combustion air comes from outside and all flue gases discharge outside.
It is designed to operate with a nonpositive vent static pressure.

5. According to ASTM E136, for a material to be considered 'noncombustible materials', the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than what temperature above the furnace temperature at the beginning of the test?

30°F (17°C)
54°F (30°C)
75°F (42°C)
100°F (56°C)

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