... air handling units 2.Supply fresh air,exhaust contaminated air 3.Air volume:2000~40000m3/h 4.Energy saving 1,Air ... , Optional Type: Ceiling&Vertical&Horizontal type5. Application: for air conditioning system in industrial & commercial building, hotel & restaurant ... air or return air working condition both available.7, Stainless Steel drain pan,G4 filter, controller board for option.8, multi-function ...