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Where lower-combustion air openings connect with crawl spaces, such spaces shall have unobstructed openings to the outdoors at least twice that required for the combustion air openings. The height of the crawl space shall comply with the requirements of the building code and shall be without obstruction to the free flow of air.
In addition, the lowest side of combustion air openings connecting with crawl spaces shall be a minimum of 12 inches (300 mm) above the adjoining grade level.
Where combustion air is obtained from an attic area, the attic ventilating openings shall not be subject to ice or snow blockage, and the attic shall have not less than 30 inches (762 mm) vertical clear height at its maximum point. Attic ventilation openings shall be sufficient to provide the required volume of combustion air and the attic ventilation required by the building code. The combustion air openings shall be provided with a sleeve of not less than 0.019 inch (0.5 mm) (No. 26 Gauge) galvanized steel or other approved material extending from the appliance enclosure to at least 6 inches (152 mm) above the top of the ceiling joists and insulation.
Openings and ducts shall not connect appliance enclosures with a space in which the operation of a fan will adversely affect the flow of combustion air. Combustion air shall not be obtained from a hazardous location, except where the fuel-fired appliances are located within the hazardous location and are installed in accordance with the building code. Combustion air shall not be taken from a refrigeration machinery room.
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.
Exception: Direct vent gas-fired appliances designed for installation in a solid fuel burning fireplace where installed in accordance with the listing and the manufacturer's instruction.
Fuel burning space heating and/or water heating equipment with a combined input rating greater than 150,000 Btu/hour shall be provided with air from outdoors for combustion and dilution using the methods described in Section 18-28-703.3.
Exception: Single-family and two-family dwellings (including townhouses) are not required to use outdoor air for combusting and dilution. Such dwellings shall be provided with air for combustion and dilution in accordance with Sections 18-28-702, 18-28-703.2, or 18-28-703.3.
Fuel-burnings heating equipment and/or water heating equipment with a combined input rating less than or equal to 150,000 Btu/hr is not required to be provided with air from outdoors. However, the air volume within the space shall comply with the unconfined space definition for the aggregate input rating of all fuel-burning heating equipment and/or water heating equipment installed in that space. Fuel burning appliances typically used on an intermittent basis, such as clothes dryers, residential cooking equipment, and/or fireplaces are not required to be provided with air from outdoors. However, the combined air volume within the adjacent, communicating living spaces (not including bedrooms, bathrooms, and toilet rooms) shall comply with the unconfined space definition for the aggregate input rating of all fuel burning appliances installed in those living spaces.
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