12" Roof Curb Adaptor, One Piece Welded Construction, All Welds Sprayed with Galvanizing Compound, Factory Install Supply Transition, Fully Insulated with 1"- 1 1/2 Lb Density Insulation, Fabricated of Heavy Gauge Galvanized Steel, Supply Dims:16-1/4" X 24", Return Dims:20-3/4" X 24", Top Dims:80-3/4" X 50-5/8", Bottom Dims:94" X 64-1/4",Weight:110 Lbs, In Bulk, Made in USA.(For Use With Exisiting Units:Luxaire:BCB, BDF 090,120, DHB, DHC, DUC, DUS 090-150, New Units:BP, DH, DM, 078-150; XP, ZF, ZH, ZJ, ZR, 078-150; ZH, ZJ, ZR 037 & 049 & 061 DF 078-120, DR 090-150, DJ 150)