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14 Cards in this Set
- Front
- Back
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Air to gas ratio |
10:1 |
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Direct vent appliances get air how |
Supplied directly to the appliance and is vented away in a sealed environment |
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BTU cut off point |
400,000 |
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Combustion air sizing is taken from input or output put |
Input |
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In combustion air sizing if the heating value falls between listed values on the chart ..... |
You go up to the next largest size |
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If the equivalent length is over 20 feet and under 50 what do you do ? |
Increase the round pipe size by one diameter |
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What are the equivalent lengths for each fitting |
90 degree elbow = 10' 45 degree elbow = 5' Reducer = 5' Hood = 10' Termination = 5' Insulated flex is double. |
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If a combustion air run is over 50' what must be done |
A different location must be found . |
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When appliances have the same draft control device all you have to do is? |
Add the input together and follow the appropriate chat for size |
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When there are two or more appliances and two have draft controls and one doesn't you must do what |
Calculate the total of all the appliances that only have draft hoods on table 8.1 next calculate the total of all of the appliances on table 8.2 then choose the largest size. |
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What is clause 8.2.3 |
It describes that whenever a single water heater is installed in a room or building and it has a total input off less than 50,000 it does not require any combustion air. Because the only operate for about 2 hours a day. |
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Clause 8.2.4 describes what |
Loose construction |
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Clause 8.2.6 attached space |
Hole size in the wall needs to be not less than 1 square inch per 1000 BTU . No higher than 18" and no lower than 6" from the floor . |
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8.2.6 b |
If any of the equipment installed in the mech room has a draft control device |
