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OARA — Oval-to-Round Adapter

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.

How to Purchase

Vent FAQs

OARA — Oval-to-Round Adapter


  • HC_OARA_Oval-to-Round AdapterThe oval-to-round adapter is used for conversion of vent from oval to round.
  • Requires use of RAA male adapter to continue with round.

Oval-to-Round Adapter dimensions (inches)

ModelSizeDim. A
4OARA4"6 7/8"
5OA5RA5"9 3/8"