803.10.6 Clearances.

Connectors shall have a minimum clearance to combustibles in accordance with Table 803.10.6. The clearances specified in Table 803.10.6 apply, except where the listing and labeling of an appliance specifies a different clearance, in which case the labeled clearance shall apply. The clearance to combustibles for connectors shall be reduced only in accordance with Section 308 or via the use of a listed chimney or vent connector system.

Table 803.10.6
Connector Clearances to Combustibles

Type of Appliance	Minimum Clearance (inches)
Domestic-type appliances
Chimney and vent connectors
Electric and oil incinerators	18
Oil and solid fuel-burning appliances	18
Oil appliances labeled for venting with Type L vents	9
Commercial, industrial-type appliances
Low-heat appliances
Chimney connectors
Oil and solid fuel boilers, furnaces and water heaters	18
Oil unit heaters	18
Other low-heat industrial appliances	18
Medium-heat appliances
Chimney connectors
All oil and solid fuel-burning appliances	36
High-heat appliances
Masonry or metal connectors
All oil and solid fuel-burning appliances	In accordance with NFPA 211

 

For SI: 1 inch = 25.4 mm.

Section MC 804: Direct-Vent, Integral Vent and Mechanical Draft Systems

804.1 Direct-vent terminations.

Vent terminals for direct-vent appliances shall be installed in accordance with the manufacturer's instructions. In addition, direct vent terminations shall comply with the following requirements:

   1.   Where located adjacent to walkways, the termination shall be not less than 7 feet (2133.6 mm) above the level of the walkway.

   2.   Vents shall terminate at least 3 feet (914.4 mm) above any forced air inlet, other than the forced air inlet for the subject direct vent appliance, located within 10 feet (3048 mm).

   3.   The vent system shall terminate at least 4 feet (1219.2 mm) below, 4 feet (1219.2 mm) horizontally from or 1 foot (304.8 mm) above any door, window or gravity air inlet into the building.

   4.   The vent termination point shall not be located closer than 3 feet (914.4 mm) to an interior corner formed by two walls perpendicular to each other.

   5.   The vent termination shall not be mounted directly above or within 3 feet (914.4 mm) horizontally from any gas or electric metering, regulating, venting relief equipment or other building opening.

   6.   The bottom of the vent termination shall be located at least 36 inches (914.4 mm) above finished grade.

   7.   The maximum heat input of an appliance served by single horizontal vent termination shall be 350,000 Btu/h (102.6 kW), unless otherwise approved by the commissioner.

   8.   The maximum heat input of all appliances served by horizontal vent terminations located within a 10 foot (3048 mm) radius shall be 350,000 Btu/h (102.6 kW), unless otherwise approved by the commissioner.

   9.   The vent termination shall be located a minimum of 4 feet (1219.2 mm) from the lot line or from adjacent buildings. The termination shall be installed in accordance with the vent manufacturer's instructions.

Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2014/051.