... ,applying to industrial plants,greenhouse,hens for livestock and poultry,and other building. High-quality alloy body; Notable ... FH -400 new circulation fan3.Automatic curtain -like ventilator and fan hoodCharacteristics and parameters of ventilator:Appearance size:width 600mm, ... a stamping process,no deformation,non-broken,beautiful and durable High-precision dynamic balance calibration testing to ...