18-28-1004.3.1 Top clearance.
   The following boilers shall have a minimum clearance of 7 feet (2134 mm) from the top of the boiler to the ceiling: High-pressure steam boilers that have a steam-generating capacity in excess of 5,000 pounds per hour (2268 kg/h), or a heating surface in excess of 1,000 square feet(93 m 2 ), or an input in excess of 5,000,000 BTU/hr (1465 kW). The following boilers shall have a minimum clearance of 3 feet (914 mm) from the top of the boiler to the ceiling: (1) Steam-heating boilers and hot-water-heating boilers that exceed one of the following limits: 5,000,000 BTU/hr input (1465 kW); or 5,000 pounds of steam per hour (2268 kg/h) capacity or a heating surface in excess of 1,000 square-foot (93 m 2 ); and (2) high-pressure steam boilers that do not exceed one of the following limits: 5,000,000 BTU/hr input (1465 kW); or 5,000 pounds of steam per hour (2268 kg/h) Capacity or heating surface in excess of a 1,000-square-foot (93 m 2 ); and (3) all boilers with manholes on top of the boiler. The following boilers shall have a minimum clearance of 2 feet (610 mm) from the ceiling: package boilers, steam-heating boilers and hot-water-heating boilers which do not have manholes on top of the shell and which do not exceed any one of the limits of this section.