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If a gas-fired furnace is located on a platform above a solid ceiling of a bathroom, toilet room or bedroom, the space above such rooms shall be subject to the same conditions as if they were located in a closet accessed directly from those rooms (if access is provided from those rooms and the space is enclosed by walls and a ceiling).
(a) Gas-fired furnaces shall meet the following criteria if installed in this space:
1. The platform shall be designed to support the weight of the gas furnace.
2. The gas furnace shall be specifically designed for installation in alcoves or closets.
3. Gas furnace shall be installed in accordance with the manufacturer's specifications and shall be installed on a floor of noncombustible construction with noncombustible flooring and surface finish and with no combustible material against the underside of the gas furnace, or on fire-resistive slabs or arches with no combustible materials against the underside of the gas furnace.
4. Combustion air shall be provided in accordance with Section 18-28-703.2.
Exception: Where there are vertical and/or horizontal space limitations, it is permissible for the two permanent combustion air openings to abut one another.