It takes ____of air for every cubic feet of gas. This 10 to one ratio plus the additional excess air will provide enough air for combustion.
10 ft3
Construction with exterior walls that are covered by a continuous sealed vapour barrier and the interior walls with drywall with sealed joints
Tight construction
Does not have vapour barrier or has an equivalent leakage of 17 in.² or less at a differential pressure of 0.00145 PSIG
Loose construction
Input rating of a furnace is found on ___
Rating plate
Combustion air sizing is always taken from ____
Input rate
Equivalent lengths
Hood = ?
90° elbow = ?
45° elbow = ?
Reducers = ?
Termination pod = ?
Insulated flex = ?
10’
10’
5’
5’
5’
Double the length
Clause 8.2.6 tells you that an opening of not less than one square inch per 1000 BTUH is need to be installed not less than ____ from floor and no higher than ____ from the floor for equipment that has a draft control device
6 inches
18 inches
Divide input rating of appliance by 1000 then that will equal ____
Free opening area
If any equipment installed in, a mechanical room has a draft control device then an additional opening must be provided that has same free area as other opening and shall be located __________, but not below the relief opening of the lowest draft hood
As near as ceiling as possible
It takes of air for every cubic feet of gas. this 10 to one ratio plus the additional excess air will provide enough air for safe combustion.
10 ft.³
Construction with exterior walls that are covered by a continuous sealed vapour barrier and the interior walls with drywall with sealed joints
Tight construction
Does not have vapour barrier or has an equivalent leakage of 78 in.² or less at a differential pressure of 0.0145 PSIG
Loose construction
Input rating of furnace is found on ____
Rating plate
Combustion air sizing is always taken from ____
Input rate
Clause 8.2.6 tells you that an opening of not less than one square inch per 1000 BTUH is needed to be installed not less than ___ from the floor and no higher than ____ from the floor for equipment that has a draft control device
6”
18”
Divide input rating of appliance by 1000 and that will equal ____
Free opening area
If any equipment installed in, a mechanical room has a draft control device then an additional opening must be provide provided that has the same free area as other opening and shall be located _______, but not below the relief opening of the lowest draft hood.
As near as ceiling as possible
Common material used to connect to air supply grill can be ____
Galvanized pipe, flexible, aluminum, or flexible cloth material materials
At ____temperatures condensation will occur
-40°
All gas vents must be more than ______ away from an air intake
36 inches
The combustion air intake must terminate within ______ from burner
1 feet above and 2 feet horizontal
Hoods must be labelled as ____ and must have ____ to stop animals from entering
Intake, screens
Inlet be no less than _____ above grade
12 inches
Any intake must not be less than ____ of the depth of expected snow accumulation
18 inches
