18-28-928.2.1 Enclosed type.
   Clearance shall comply with the following:
   1.   Unlisted enclosed illuminating appliances installed outdoors shall be installed with clearances in any direction from combustible material of not less than 12 inches ( 300 mm).
   2.   Unlisted enclosed illuminating appliances installed indoors shall be installed with clearances in any direction from combustible material of not less than 18 inches (460 mm).