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Plenum Rated

Plenum Rated

Plenum Rated

(OP)
I need to understand the specifications associated with A/C ducting as related to being "plenum rated".
Can anyone help me?

RE: Plenum Rated

Cinema,

I am not sure what that means in regards to ductwork, and I think that maybe you don't have to worry about this too much.  Typically, plenum rated means that the item doesn't have a flame spread greater than 25 and a smoke developed rating greater than 50.  Most things in a system are metal and most insulation meets these criteria.  I think all it would take is a cursory check on the materials to make sure you are OK.

Electrical cable needs to be plenum rated to be installed in a return plenum.  This rating means the same as above.

RE: Plenum Rated

Thanks Louie, I appreciate it. Can you tell me what the flame spread of 25 and the smoke developed rating of 50 mean?

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