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FCX — Single-Wall Increaser

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

FCX — Single-Wall Increaser


The single-wall increaser is used to increase the connector diameter.AV_FCX_VC line drawing single-wall increaser

Available sizes (inches)

3FCX44"4 1/2"3 1/2"
3FCX55"5 1/2"3 1/2"
3FCX66"6 1/2"3 1/2"
4FCX55"5 1/2"4 1/2"
4FCX66"6 1/2"4 1/2"
5FCX66"6 1/2"5 1/2"