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→Plenum-rated cable: tweak
==Plenum-rated cable==
==Plenum-rated cable==
In some buildings, the HVAC system uses isolated ducts for incoming and return forced air. In this case, regular Ethernet cabling can be run in the non-circulating airspace. However, some HVAC systems only use ducts to provide air, and return air travels through the entire space above the drop ceiling. When cabling is run through this circulating plenum airspace, special cabling is used. If a fire broke out, regular cabling above the ceiling would begin to melt and burn, releasing large amounts of smoke as well as some toxic fumes. When the cables are in an isolated area, this is not a major concern, but when they are in the plenum air space, these fumes will be released into the room. For this reason, special cabling is used for plenum space.<ref>http://www.ecmag.com/section/systems/plenum-vs-non-plenum</ref><ref>http://www.tektel.com/b1/all-about-plenum-cable</ref><br />
In some buildings, the HVAC system uses isolated ducts for incoming and return forced air. In this case, regular Ethernet cabling can be run in the non-circulating airspace. However, some HVAC systems only use ducts to provide air, and return air travels through the entire space above the drop ceiling. When cabling is run through this circulating plenum airspace, special cabling is used. If a fire broke out, regular cabling above the ceiling would begin to melt and burn, releasing large amounts of smoke as well as some toxic fumes. When the cables are in an isolated area, this is not a major concern, but when they are in the plenum air space, these fumes will be released into the room. For this reason, special cabling is used for plenum space.<ref>http://www.ecmag.com/section/systems/plenum-vs-non-plenum</ref><ref name="tektel.com">http://www.tektel.com/b1/all-about-plenum-cable</ref><br />
Plenum cables are jacketed in Florinated ethylene polymer (FEP) with Polyvinyl Chloride (PVC), which produces much less smoke. However, this cabling is usually less flexible so it can be more difficult to install.
Plenum cables are jacketed in special flame-retardant, low smoke materials. The most common kind use Florinated ethylene polymer (FEP) with Polyvinyl Chloride (PVC).<ref name="tektel.com">http://www.tektel.com/b1/all-about-plenum-cable</ref> Unfortunately, this cabling is usually less flexible so it can be more difficult to install.
==See also==
==See also==