hepa filter fan box are high clean instruments for clean rooms ,especianlly for semiductor,LCD industry low noise good blowe hepa filter fan box character: · external frame:stainless or cole rolled powder paiting or galvalume · low vibration , low noise · shock :0.4-0.5m/s the highest purification level:10level· filter media : superfine glassfiber filter the ffu adopts the lastest domestic ...