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#38092 - 05/14/04 05:11 PM plenum question
seattleman Offline

Registered: 02/01/04
Posts: 17
Loc: Seattle, WA, USA
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.

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#38093 - 05/14/04 05:47 PM Re: plenum question
Ryan_J Offline

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
Basically, everything has to be plenum rated if its in a plenum ceiling.
Ryan Jackson,
Salt Lake City

#38094 - 05/14/04 05:50 PM Re: plenum question
resqcapt19 Offline

Registered: 11/10/00
Posts: 2209
Loc: IL
Look at 300.22(C).

#38095 - 05/14/04 06:02 PM Re: plenum question
ProCircuit Offline
Junior Member

Registered: 05/14/04
Posts: 8
Loc: Riverside, CA

#38096 - 05/14/04 06:03 PM Re: plenum question
maintenanceguy Offline

Registered: 12/02/01
Posts: 303
Loc: Southern NJ, USA
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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