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19 Cards in this Set
- Front
- Back
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Btu formula |
Gallons x Delta T (degree chance) x 8.33 lbs |
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B vent |
Steel insulated vent pipe |
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Causes for backdraft |
Not sized correctly Location of vent Tree growth Addition to house |
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Vent termination |
3 ft above roof, 2 feet above wall or roof within 10 ft of vent termination |
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Smoke pipe pitch |
1/4" per foot |
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Make up air |
1000 btus ÷ 50 cubic ft of air = 1 cubic ft of air = Supports 20 btus |
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Inside make up air 1 square in = ___ btus |
1,000 btus |
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Outside horizontal ducts 1 square inch = ___ btus |
2,000 btus |
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Directly from outside 1 square inch = ____ btus |
4,000 btus |
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The opening directly from outside 1 square in = ___ btus |
3,000 btus |
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Atmospheric pressure at sea level |
14.7 psi |
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High altitude above 2,000 feet |
4% reduction of input rating of equipment |
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Capacity of gallons of pipes and tanks |
Diameter in square x L in x .0034 Diameter in square x L ft x .0408 Diameter ft square x L ft x 5.87 |
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Horizontal vents |
Single wall- 75% of chimney height Double wall- 100% of chimney height |
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Specific gravity of Natural gas |
.60 |
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Specific gravity of LP (propane) |
1.5 |
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Underground gas pipe |
Direct burial Coated steel pipe with tape Csst Soft Copper on LP if sulfites too high no copper on natural gas |
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Heating value of Natural gas |
1000 |
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Heating value of LP |
2500 |
