Sometimes the entire area above the suspended ceiling is a plenum. It
depends on the HVAC design. I found this out the hard way. If you are
ever in the South Burlington Middle School library and wonder why the
VGA cable to the projector is in a wiremold below the ceiling, you can
--Steve "I shudda checked" Barner
From: School Information Technology Discussion
[mailto:[log in to unmask]] On Behalf Of Ray Ballou
Sent: Wednesday, March 05, 2008 2:24 PM
To: [log in to unmask]
Subject: Re: Power for Ceiling Mounted projectors
>VGA cords to ceiling mounted projectors needed to be plenum rated
I must have missed this prior conversation, but this should only matter
if the cables actually run within 'plenum', not just a 'regular'
"PVC vs. plenum. ... It can be used for horizontal and vertical runs,
but only if the building features a contained ventilation system."
""Plenum" is the technical term for the space above a suspended ceiling
when it is used to return air from ventilated spaces such as offices to
heating and air conditioning equipment. To simplify construction,
ceiling spaces are often used as air-return plenums in office and other
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