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.
Flashing - Standard The standard flashing fits flat to 5/12 pitch roof, and is made of double-seamed construction for protection from leakage. For a standard flashing with a 6" skirt, the Model No. reads the size and EFFU or RFFU.
Flashing - Steep Pitch The flashing with a steep pitch fits 6/12 to 12/12 pitch roofs.
Flashing - Tall Cone The flashing with a tall cone fits flat to 1/12 roofs, and is used on flat roofs in snowpacked areas to reduce pressure.
Standard Model | 6" Skirt Model | Steep Pitch Model | Tall Cone Model | Size |
---|---|---|---|---|
3EF | 3EFFU | 3EF12 | 3EFT | 3" |
4EF | 4EFFU | 4EF12 | 4EFT | 4" |
5EF | 5EFFU | 5EF12 | 5EFT | 5" |
6EF | 6EFFU | 6EF12 | 6EFT | 6" |
7RF | 3RFFU | 7RF12 | 7RFT | 7" |
8RF | 8RFFU | 8RF12 | 8RFT | 8" |
9RF | 9RFFU | - | 9RFT | 9" |
10RF | 10RFFU | - | 10RFT | 10" |
12RF | 12RFFU | - | 12RFT | 12" |
14F | 14RFFU | - | 14FT | 14" |
16F | - | - | 16FT | 16" |
18F | - | - | 18FT | 18" |
20F | - | - | 20FT | 20" |
22F | - | - | 22FT | 22" |
24F | - | - | 24FT | 24" |
26F | - | - | 26FT | 26" |
28F | - | - | 28FT | 28" |
30F | - | - | 30FT | 30" |