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#38092 05/14/04 07:11 PM
Joined: Feb 2004
Posts: 17
S
Member
A guy was talking about some lonwork transformer being above the t-grid having to be plenum rated.

I thought a plenum was a duct or airway. What kinds of things have to be plenum rated and is above the t grid in an office a plenum?

I also remember a guy talking about have tie wraps used above the t grid had to be plenum rated. I'm not familar with this.

#38093 05/14/04 07:47 PM
Joined: Aug 2003
Posts: 1,374
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Basically, everything has to be plenum rated if its in a plenum ceiling. [Linked Image]


Ryan Jackson,
Salt Lake City
#38094 05/14/04 07:50 PM
Joined: Nov 2000
Posts: 2,148
R
Member
Look at 300.22(C).
Don


Don(resqcapt19)
#38095 05/14/04 08:02 PM
Joined: May 2004
Posts: 8
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Junior Member

#38096 05/14/04 08:03 PM
Joined: Dec 2001
Posts: 300
M
Member
Sometimes the space above a drop ceiling is used as the return air plenum. If so, everything in the ceiling has to be plenum rated. Sometimes the space below a floor or in a wall can be used this way too.


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