Using tables from the National Fuel Gas Code or our Sizing & Application Guide, determine the diameter of venting required. The Sizing & Application Guide also offers tips on good design including multi-appliance system sizing and design. The System Design and Installation Guide is an additional resource.
Size | Product No. | Model No. | A - Inner Wall Dia (in) | B - Outer Wall Dia. (in) | C - Length (in) | D - Installed Length within room (in) |
---|---|---|---|---|---|---|
6" | 276247 | 6USP-MA | 6 | 6 7/8 | 11 1/2 | 3 1/2 |
7" | 277247 | 7USP-MA | 7 | 7 7/8 | 11 1/2 | 3 1/2 |
8" | 278247 | 8USP-MA | 8 | 8 7/8 | 11 1/2 | 3 1/2 |