This is a professionally designed return ductwork installation kit for the BM12MCD (12000 btu) and BM18MCD (18000 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 BM12MCD or BM18MCD return ductwork. This kit has been designed specifically to deliver an optimal performance levels and help to simplify the installation. It uses two 10 inch return ducts to optimize air mixture in your space. 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-BPK12 (12000 btu) or KIT-BPK18 (18000 btu). This kits is designed to be used with a ductboard plenum such as KIT-BPK12 or KIT-BPK18. This kit is not compatible with a sheet metal plenum. It includes:  

x2 25 feet of 10 inch R8 metalized felx ducts
x2 10 inch ductboard takeoff collars (no damper)
x2 14.5 x 14.5 x 10(round connection) non insulated ceiling boxes
x2 14 x 14 x 1 ceiling filter grilles
x1 Foil tape