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ET/RT — Tee

How to Specify

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.

Amerivent FAQs

ET/RT — Tee

Branch and trunk diameters of the standard tee are the same size. For small branch sizes, use a reducing tee up to 6" size. For larger sizes, use an increaser with a standard tee.AV_RT_TBGV line art tee


Available sizes (inches)

3ET3"7 1/8"4 1/8"
4ET4"8 7/8"4 5/8"
5ET5"10"5 1/4"
6ET6"11 1/2"5 3/4"
7RT7"13"6 1/2"
8RT8"14"6 7/8"
9RT9"15"7 3/4"
10RT10"16"8 1/16"
12RT12"17 9/16"9 3/4"
14RT14"24"11 3/4"
18RT18"28 1/2"14 1/4"
20RT20"30"15 1/2"
22RT22"33"16 3/4"