Residential Building Inspector B1Building Planning and Life SafetyHard
A residential building inspector is reviewing plans for a new single-family dwelling. The plans indicate a heating system that uses an unvented room heater. What is the maximum individual input rating allowed for an unvented room heater in a dwelling unit?
- A15,000 Btu/h
- B10,000 Btu/h
- C8,000 Btu/h
- D12,000 Btu/h
Show answer & explanationAnswer & explanation
Correct answer: B. 10,000 Btu/h
According to IRC G2436.1 (621.1), unvented room heaters shall not be installed in dwelling units unless approved and listed as supplemental heat. The IRC further specifies in G2436.2 (621.2) that unvented room heaters shall not have an input rating exceeding 10,000 Btu/h (3 kW) for an individual heater.
Why the other options are wrong
- A. This input rating exceeds the maximum allowed for an individual unvented room heater.
- C. This input rating is below the maximum allowed.
- D. This input rating exceeds the maximum allowed for an individual unvented room heater.
Unvented Room Heater Input Rating
Maximum heat output allowed for an unvented room heater to ensure safe operation and prevent indoor air quality issues.
- Limited to supplemental heat.
- Strict input rating limits.
- Prohibited in certain rooms (bedrooms, bathrooms).
Memory trick: Unvented heat, 10,000 Btu is the max beat, to keep the air fresh and sweet.