Natural gas piping in plenums

[tipidad]

Occasionally we have to run natural gas piping above the ceiling in return air plenums. This has come up recently in a couple restaurants. Can't find a code limitation. I recall in the past using welded pipe in this application. Does anyone have any thoughts? Thanks.

 

[CRG]

As I recall, NFPA has an exception that allows this.

 

[Rodale]

I would suggest corrugated stainless steel tube, CSST. It is available in many sizes and runs up to 250'. No joints in the plenum.

 

[briand2]

In the UK this is acceptable as long as the plenum serves only the room in which the gas is used.

Brian

 

[vannic]

"Gas piping inside any building shall not be run in or through an air duct, clothes chute, chimney or vent, ventilating duct, dumbwaiter (like there are a lot of these days), elevator shaft or concealed plenum."

 

[CRG]

A little more info from NFPA

A.6.2.5 It is the intent that gas piping, shutoff valves required by this code, and regulators be allowed to be installed in accessible portions of plenums, accessible ducts used to supply combustion and ventilation air in accordance with Section 5.3, and accessible spaces between a fixed ceiling and dropped ceiling.