This is a professionally designed return ductwork installation kit for the BM18MCD (18000 btu) and BM24MCD (24000 btu) concealed duct (multi room) air handler. With the exception of the return plenum itself this kit includes all of the materials needed to successfully install the BM18MCD or BM24MCD return ductwork. This kit has been designed specifically to deliver an optimal performance level and help to simplify the installation. It uses two 12 inch return ducts to optimize air mixture in your space and simplify the return air installation. It is highly recommended that you select one of the matching supply duct installation kits as well and the supply and return air plenum KIT-BPK18 (18000 btu) or KIT-BPK24 (24000 btu). This kits is designed to be used with a ductboard plenum such as KIT-BPK18 or KIT-BPK24. This kit is not compatible with a sheet metal plenum. It includes:

x2 25 feet of 12 inch R8 metalized flex ducts
x2 12 inch ductboard takeoff collars (no damper)
x2 14.5 x 20.5 x 12(round connection) non insulated ceiling boxes
x2 14 x 20 x 1 ceiling filter grilles
x1 Foil Tape