U Series of One-way Flow Fan -Imported aluminum with zinc plate housing,excellent quality,exquisite ... system U series of one-way flow fan U320M897Specifications :Imported aluminum with zinc plate housing, HEPA filters,can ... micron, make the air more fresh.Imported aluminum with zinc plate housing, excellent quality, exquisite appearance, ... (Kg) : 7.5 TKBHOME One-way Flow Fan with zinc plate housing