With the exception of wall register models, a floor furnace shall not be placed closer than 6 inches (152 mm) to the nearest wall, and wall register models shall not be placed closer than 6 inches (152 mm) to a corner.
The furnace shall be placed such that a drapery or similar combustible object will not be nearer than 12 inches (305 mm) to any portion of the register of the furnace. Floor furnaces shall not be installed in concrete floor construction built on grade. The controlling thermostat for a floor furnace shall be located within the same room or space as the floor furnace or shall be located in an adjacent room or space that is permanently open to the room or space containing the floor furnace.
Exception: The total area of the supply air ducts and outdoor and return air ducts shall not be required to be larger than the minimum size required by the furnace manufacturer's installation instructions.
- Less than 10 feet (3048 mm) from an appliance vent outlet, a vent opening from a plumbing drainage system or the discharge outlet of an exhaust fan, unless the outlet is 3 feet (914 mm) above the outdoor air inlet.
- Where there is the presence of objectionable odors, fumes or flammable vapors; or where located less than 10 feet (3048 mm) above the surface of any abutting public way or driveway; or where located at grade level by a sidewalk, street, alley or driveway.
- A hazardous or insanitary location or a refrigeration machinery room as defined in this code.
- A room or space, the volume of which is less than 25 percent of the entire volume served by such system. Where connected by a permanent opening having an area sized in accordance with Sections 918.2 and 918.3, adjoining rooms or spaces shall be considered as a single room or space for the purpose of determining the volume of such rooms or spaces.
5.2 Dedicated forced-air systems serving only a garage shall not be prohibited from obtaining return air from the garage.
6. An unconditioned crawl space by means of direct connection to the return side of a forced air system. Transfer openings in the crawl space enclosure shall not be prohibited.
7.2. This shall not apply where the room or space complies with the following requirements:
- Heating panels shall be installed parallel to framing members and secured to the surface of framing members or shall be mounted between framing members.
- Mechanical fasteners shall penetrate only the unheated portions provided for this purpose. Panels shall not be fastened at any point closer than 1/4 inch (7 mm) to an element. Other methods of attachment of the panels shall be in accordance with the panel installation instructions.
- Unless listed and labeled for field cutting, heating panels shall be installed as complete units.
- Radiant heating systems shall be identified as being suitable for the installation, and shall be secured in place as specified in the manufacturer's instructions.
- Radiant heating panels and radiant heating panel sets shall not be installed where they bridge expansion joints unless they are protected from expansion and contraction.
- Be installed in accordance with the manufacturer's instructions.
- Be installed on level platforms in accordance with Section 304.10.
- Have openings in exterior walls or roofs flashed in accordance with the International Building Code.
- Be provided with potable water backflow protection in accordance with Section 608 of the International Plumbing Code.
- Have air intake opening locations in accordance with Section 401.4.