Plenum rated cabling is required when used in an open ceiling return air environment. That is when the return air for the hvac units use the space between the ceiling of the first floor and the floor of the second floor as a return air plenum. The way to tell is if the return air vent has a duct attached to it. The duct will run to the air conditioning air handler. This condition IS NOT a plenum rated ceiling. However, if the return air vent does not have a duct, that means the air conditioning air handler is using the air space between floors as a plenum. This condition requires the use of plenum rated cabling. If plenum rated cable is exposed to flame, it does not give off toxic gases as it melts.
CPVC is safe for return air plenum use, but you should always check with the local codes and regulations adopted by your authority having jurisdiction.
Recommended for HVAC
Type cmp, catvp cl3p, fplp P designates "plenum"
There are a number of companies that manufacturer ceiling heaters. Some of the best rated brands of ceiling heaters are Broan, NuTone, Modine and Winchester.
Whitewashing the Ceiling - 1914 is rated/received certificates of: UK:U
Guts on the Ceiling - 1999 is rated/received certificates of: USA:R
Exposed - 2003 is rated/received certificates of: USA:R
Exposed - 1947 is rated/received certificates of: USA:Approved
Yes but not completely exposed to the elements. Look for Direct Burial/outdoor rated if it will be completely exposed to rain and sunlight.
Dancing on the Ceiling - 1937 is rated/received certificates of: USA:Approved (PCA #2982)