Plenum
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Posted by Bullcrappy on March 21, 2007, 6:38 pm
Please log in for more thread options i was told that just because you run cable between a drop ceiling and the hard ceiling doesnt make it plenum. If all air ways are enclosed in some sort of duct work it is NOT plenum. Air would have to be flowing freely in the space. much like in old high rise buildings in NY i'm told. there is not alot of space and the air run open and freely in the plenum. is this true? bull | ||||||||||||||||||||||||||||
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Posted by DLR on March 21, 2007, 7:15 pm
Please log in for more thread options Bullcrappy wrote: But many places now want plenum rated cable that's anywhere behind something. Varies by area. | ||||||||||||||||||||||||||||
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Posted by Dmitri(Cabling-Design.com on March 21, 2007, 9:57 pm
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Bullcrappy wrote: > i was told that just because you run cable between a drop ceiling and
> the hard ceiling doesnt make it plenum. > If all air ways are enclosed in some sort of duct work it is NOT
> plenum. > Air would have to be flowing freely in the space. much like in old > high rise buildings in NY i'm told. there is not alot of space and > the air run open and freely in the plenum. > is this true?
If BOTH incoming and return air flows are ducted then what you are saying is correct. In practice though only incoming flow is ducted and so basically any cavity above the drop ceiling can facilitate air return hence moving air hence new oxygen in case something burns up there. So, if your fire marshal tells you it's plenum it's really hard to argue because usually he is correct, both technically (you don't control the return air) and by law. -- Best Regards, Dmitri Abaimov, RCDD http://www.cabling-design.com/ Home Cabling Guide, Cabling Forum, color codes, pinouts and other useful resources for premises cabling users and pros -- +----------------------------------------------------------+ | http://forums.cabling-design.com/ | | *** a better way to USENET *** | | no-spam Web and RSS interface to your favorite newsgroup | | comp.dcom.cabling - 3164 messages and counting! | +----------------------------------------------------------+ | ||||||||||||||||||||||||||||
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Posted by DLR on March 22, 2007, 12:12 am
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Dmitri(Cabling-Design.com) wrote: > Bullcrappy wrote:
> > >> i was told that just because you run cable between a drop ceiling and
>> the hard ceiling doesnt make it plenum. >
>> If all air ways are enclosed in some sort of duct work it is NOT
>> plenum. >> Air would have to be flowing freely in the space. much like in old >> high rise buildings in NY i'm told. there is not alot of space and >> the air run open and freely in the plenum. >
> >> is this true?
>
When the fire marshal tells you something it's true even if it's not.
> > If BOTH incoming and return air flows are ducted then what you are saying > is correct. In practice though only incoming flow is ducted and so > basically any cavity above the drop ceiling can facilitate air return > hence moving air hence new oxygen in case something burns up there. > > So, if your fire marshal tells you it's plenum it's really hard to argue > because usually he is correct, both technically (you don't control the > return air) and by law. > Arguing with them is asking for the doors to be padlocked. I work with architects and they'll debate the gray in the building codes all day long but when the fire marshal arrives, he gets obeyed. He can ruin you life faster than almost anyone on the planet not using a weapon. | ||||||||||||||||||||||||||||
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Posted by DTC on March 22, 2007, 2:59 pm
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DLR wrote: > He can ruin you
> life faster than almost anyone on the planet not using a weapon. Including an ex-wife (so I have been told). | ||||||||||||||||||||||||||||
| Similar Threads | Posted |
| Plenum | March 21, 2007, 6:38 pm |
> the hard ceiling doesnt make it plenum.
>
> If all air ways are enclosed in some sort of duct work it is NOT
> plenum.
> Air would have to be flowing freely in the space. much like in old
> high rise buildings in NY i'm told. there is not alot of space and
> the air run open and freely in the plenum.
>
>
> is this true?
>