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 OVAL Wall (in) | B - Outer OVAL Wall (in) | C - Inner Wall Dia (in) | D - Outer Wall Dia (in) | E - Length (in) | F - Installed Length (in) |
---|---|---|---|---|---|---|---|---|
8" to 8" | 278250 | 8USP-ORA | 6" x 10 5/8" | 6 3/4" x 11 1/2" | 8 | 8 7/8 | 15 1/4 | 12 7/8 |
8" to 6" | 278251 | 8USP-ORA6 | 6" x 10 5/8" | 6 3/4" x 11 1/2" | 6 | 6 7/8 | 15 1/4 | 12 7/8 |