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 ...

Minneapolis, MN. — (September 18, 2007) — www.chiefmfg.com — Chief Manufacturing, the industry leader in mounting solutions, is excited to announce that its Pre-Installation Box Accessories are now ...

A large plenum box that fell from a passing truck slowed southbound traffic along Interstate 35E near Commonwealth Drive Wednesday afternoon. The box apparently fell off a truck after it passed ...