Chapter 7: Combustion Air Flashcards
When using the Standard Method, what is the minimum required volume of indoor combustion air?
50 cubic feet per 1,000 Btu/hr.
Combining spaces in different stories, the openings in doors and floors shall have a total minimum free area of _________ square inch(es) per 1,000 Btu/hr.
2 square inches (with a minimum opening size of 100 square inches)
Outdoor combustion air openings shall have a minimum or _______ inch(es).
3 inches
Two combustion air openings communicating directly to the outdoors shall commence within _______ inches of the top and ______ inches of the bottom of the enclosure.
12 inches, 12 inches
The One Permanent Opening Method requires that equipment shall have a minimum clearence of _____ inch(es) from the front of the appliance.
6 inches
Appliances located in a confined space with air taken from the outside of the structure by means of one vertcal or horizontal duct shall have a minimum free area of 1 square inch per _________ Btu/hr.
3,000
Engineered combustion air instillations shall provide adequate supply of combustion, ventillation, and silution air and shall be approved by the ______.
Authority Having Jurisdiction
Where all cumbustion air is provided by a mechanical air supply syatem, the combustion air shell be supplied fro outdoors at a minimum rate of __________ cubic feet per 1000 Btu/hr.
0.35 Cubic feet
Where exhaust fans are installed, additional air shall be provided to replace the __________ air.
Exhausted
Where the design and free area are not known, it shall be assumed that wood louveres will have ________ free space.
25%
Where the design and free area are not known, it shall be assumed that metal louvers will have _________ percent free area.
75%
_________ louvers shall be interlocked with the equipment so they are proven in the full open position prior to main burner ignition and during main burner operation.
Motorized
Combustion air ducts shall serve a ________ space.
Single
Intakes for combustion air ducts located exterior to the building shall have the lowest side of the combustion air intake at least _________.
12
________ operated dampers shall not be installed in combustion air openings.
Manually
Horizontal combustion air ducts shall not slope ________ toward the source of combustion air.
Downward
The remaining space surrounding a chimney liner, gas vent, special gas vent, or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air unless it is ___________ in the manufacturer’s instillation instructions.
Listed and shown
The Known Air Infiltration Rate Method requires (15ft3/ACH) x (Ifan/1,000 Btu/h) for fan assisted appliances, but no smaller than _________ cubic feet per 1,000 Btu/hr.
25 Cubic feet
The One Permanent Opening Method requires the equipment have a clearance of at least _________ inch(es) from the side and back.
1 Inch
Combustion air is not required for _________.
Domestic clothes dryers
Combustion air ducts, except in dwellings, shall be made of _____________.
Galvanized steel
When determining combustion air requirements, operation of exhaust fans, kitchen ventilating systems, clothes dryers, and fireplaces shall have ___________.
Makeup air provided
Combustion air ducts that terminate in an attic shall be screened ____________.
At neither end
Power-actuated movable louvers admitting combustion air may be used __________.
With prior approval
Appliances located in a combined space with all air taken from the outside of the building and from the same story shall have each opening for combustion air sized at 1 square inch per ___________ Btu/hr.
1,000 Btu/hr. (minimum 100 square inches)
Appliances located in a confined space with all air taken from the outside by means of two horizontal ducts shall have each opening size based on 1 square inch per ________ Btu/hr.
2,000 Btu/hr.
Dampers in combustion air ducts or plenums are _____________>
Prohibited
The required size of combustion air openings shall be ____________.
Based on the net free area of each opening
