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�� F - �- ( s 7`-�� 1991 UNIFORM MECHANICAL CODE 1904-1905 (g)Clearance.Such equipment shall be installed so as not to raise the tempera- ture of surrounding combustible materia( more than 90°F. above ambient. Small Ceramic Kilns Sec. 1905. (a) General. The provisions of this section apply to kilns used for ceramics that havc a ►naximum interior volume of 20 cubic feet and are used for hobby or noncommercial purposes. (b)Installation. Kilns shall be installed in accordance with the manufacturer's instructions and the provisions of this code. (c) Fuel-gas Controls. Fuel-gas controls shall comply with Sections 503 and 506. Standing pilots shall not be used with gas-fired kilns. (cl) N;lectrical Equipment. All cicctrical eyuipment uscd as part of, or in connection with, the installati��ns of a kiln shall comply with the requiretnents set forth in the Electrical Code. (e) Installations inside I3uilclinKs. In additi�m to othcr requirements specif�ied in this section, interior installation shall meet the following rcyuirements: l. Kiln clearances. "I'he�sides and tops of kilns shall he locatcd a minimun�of 18 inches from atiy noncombustible wall surface and 3 feet from any cornbustible wall surface. Kilns shall be installed on noncombustible flooring consisting of at least 2 inches of solid masonry or concrete extending at least 12 inches beyond the base or supporting members of the kiln. EXCEPTION: These clearances may be reduced, provided the kiln is installed in accordance with its listing or to acceptable conclosions of testing reports submit- ted to the building official. ln no case shall the clearance on the gas or electrical control side of a kiln be reduced to less than 30 inches. 2. Hoods. A canopy-type hood shall be installed directly above each kiln. The face opening area of the hood shall be equal to or greater than the top horizontal surface area of the kiin. 1'he hood shall be constructed of not less than 0.024-inch (No. 24 U.S. gage)galvanized steet or equivalent and be supported at a height of between 12 inches and 30 inches above the kiln by noncombustible supports. EXCFPTION: E?tectric kilns installed with listed exhaust blowers may be used � when marked as being suitable for the kiln and installed in accordance with manufac- � .. turer's instructions. :?: 3. Gravity ventilation ducts. Each hood shall be connected to a gravity ventilation duct extending in a vertical direction to outside the building.This duct shall be of the same constructi<�n as the hood and shail have a minimum cr��ss- sectional area of n��t less than one fifteenth of the face opening area of the hood. The duct shall terminate a minimum of 12 inchcs above any portion of a building within 4 feet and terrninate no less than 4 fcet from any openable windows or other openings into the building or adjacent property line. The duct opening to the outside shall be shielded, without reduction of duct area, to prevent entrance of rain into the duct. The duct shall be supported at each section by noncombustible supports. 149