... room or warehouse Efficient air Cooler produced by Chenguang includes BDF,LZW FD Series, ceiling and floor types ... Ammonia and Freon refrigeration system. BDF and LZW series with aluminum pipe and fins are chiefly designed ... freon syetem.Refrigerants: R717(BDF,LZW series), R22,R404a,R507C(FD series)Material:aluminum pipes and fins for ... 10mm,12mmTemperauture range: +5C- -30C. GF Series Ceiling Air Cooler