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18-28-803.10.6  Clearances.
   Connectors shall have a minimum clearance to combustibles in accordance with Table 18-28-803.10.6. The clearances specified in Table 18-28-803.10.6 apply, except where the listing and labeling of an appliance specifies a different clearances, in which case the labeled clearance shall apply. The clearance to combustibles for connectors shall be reduced only in accordance with Section 18-28-308.
Table 18-28-803.10.6
Connector Clearances to Combustibles
Type of Appliance
Minimum Clearance (Inches)
Type of Appliance
Minimum Clearance (Inches)
Domestic-type appliances
Chimney and vent connectors
Electric and oil incinerators
18
Oil and solid fuel 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 gas, oil and solid fuel appliances
36
High-heat appliances
Masonry or metal connectors
All gas, oil and solid fuel appliances
(As determined by the code official)
 
For SI: 1 inch = 25.4mm.