17233171
Description
Flashcards by Andrew Adams, updated more than 1 year ago
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Created by Andrew Adams
about 5 years ago
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| Question | Answer |
| life expectancy gas fired air furnace | 15-25 years |
| life expectancy oil fired air furnace | 20-30 years |
| life expectancy electric furnace | 20-25 years |
| life expectancy cast iron boiler | 30-50 years |
| life expectancy steel boiler | 30-40 years |
| life expectancy circulating pump | 10-15 years |
| life expectancy heat pump(compressor) | 12-15 years |
| oil furnace/boiler clearances | 6" on top/sides; 24" in front |
| gas furnace/boiler clearances | 6" top and sides; 18" front(can be less per specs) |
| single wall smoke pipe clearances | 18" for units w/o draft hood; 9" for oil w/draft good; 6" for gas |
| double wall smoke pipe | 3-9" clearance |
| Type B clearance | 1" |
| minimum vent connector rise | 1/4" per foot |
| Roof clearances for chimney or vent | for 3' chimney or 2' B vent, must be higher than 2' above anything within 10' |
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