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.
Diameter (3" to 12") | ||||||||
---|---|---|---|---|---|---|---|---|
Length (6" to 5') | 3" | 4" | 5" | 6" | 7" | 8" | 10" | 12" |
6" | 3RP6 | 4RP6 | 5RP6 | 6RP6 | ||||
12" | 3RP12 | 4RP12 | 5RP12 | 6RP12 | 7RP12 | 8RP12 | ||
18" | 3RP18 | 4RP18 | 5RP18 | 6RP18 | 7RP18 | 8RP18 | 10RP18 | 12RP18 |
24" | 3RP24 | 4RP24 | 5RP24 | 6RP24 | 7RP24 | 8RP24 | 10RP24 | 12RP24 |
3' | 3RP3 | 4RP3 | 5RP3 | 6RP3 | 7RP3 | 8RP3 | 10RP3 | 12RP3 |
4' | 3RP4 | 4RP4 | 5RP4 | 6RP4 | 7RP4 | 8RP4 | ||
5' | 3RP5 | 4RP5 | 5RP5 | 6RP5 | 7RP5 | 8RP5 | 10RP5 |