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EWT/RWT — Wall Thimble

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

EWT/RWT — Wall Thimble

The wall thimble adjusts for various wall thicknesses from 4" to 6", and provides proper clearance for vent from combustibles.AV_EWT_TBGV line art wall thimble

Available sizes (inches)

ModelSizeABC
3EWT3"5 1/2"3 1/16"3 9/16"
4EWT4"6 1/2"3 1/16"4 9/16"
5EWT5"7 1/2"3 1/16"5 9/16"
6EWT6"8 1/2"3 1/4"6 9/16"
7RWT7"10"3 1/4"8 1/16"
8RWT8"11"3 1/4"9 1/16"
9RWT9"12"3 1/4"10 1/16"
10RWT10"13"3 1/4"11 1/16"
12RWT12"15"3 1/4"13 1/16"