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RP — Round Pipe (3-12")

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

RP — Round Pipe (3-12")

Assets/Details

  • HC_1RP 3 thru 12_drw3" to 12" pipe and fitting couplers overlap 1-3/8" when joined together; therefore, assembled length is 1-3/8" less than listed length.
  • The allowable minimum clearance to combustibles is 1", except for 4RPX on which clearance is provided by locking band on pipe only when installed in a 2 x 6 stud wall.
  • Outside Diameter (OD) Sizes 3" through 6" is size plus 1/2". Sizes 7" through 12" is size plus 1"
  • A full set of installation instructions are supplied with caps and supports.

Round Pipe (sizes 3-12)

Listed Length
Diameter3"4"5"6"7"8"10"12"
5'3RP54RP55RP56RP57RP58RP5
4'3RP44RP45RP46RP47RP48RP4
3'3RP34RP35RP36RP37RP38RP312RP312RP3
24"3RP244RP245RP246RP247RP248RP2412RP2412RP24
18"3RP184RP185RP186RP187RP188RP1812RP1812RP18
12"3RP124RP125RP126RP127RP128RP12
6"3RP64RP65RP66RP6