... ×W×H)Pits: 2 rows of pits in the ground for outlet, dimension of each pit is 13850×760mm (L×W), with galvanized grilles made ... , inside is galvanized steel, filled with heat preservation material inside.Intake and exhaust system(2 sets): Inlet: 2 sets, in total 4×7 ... capacity is 21000m3/h for each fan; Outlet: 2×11KW double-intake centrifugal fans, with motor outside, belt-drive, model TAE-710H ...