609.4 Clearance.
FGC § 609.4
The lowest portion of the floor furnace shall have not less than a 6-inch (152.4 mm) clearance from the grade level; except where the lower 6 inch (152.4 mm) portion of the floor furnace is sealed by the manufacturer to prevent entrance of water, the minimum clearance shall be not less than 2 inches (50.8 mm). Where such clearances cannot be provided, the ground below and to the sides shall be excavated to form a pit under the furnace so that the required clearance is provided beneath the lowest portion of the furnace. A 12 inch (304.8 mm) minimum clearance shall be provided on all sides except the control side, which shall have an 18 inch (457.2 mm) minimum clearance.













