The plenum rating ensures that Chief’s pre-install boxes have passed UL standards for safety. Chief’s PAC510, PAC515 and PAC520 Pre-Installation Box Accessories organize cables and electrical ...

However, plenum-rated cable isn’t suitable for installation in wet locations. It has microscopic holes in its outer covering, which allows the water to wick past the cable sheath and change the ...

A UL-approved fiberglass plenum box with ceiling radiation damper (CRD) is available in three model styles. The fiberglass plenum boxes are offered in 1- and 1-1/2-inches-thick rigid ductboard with ...