... , goose neck modelWater pipes: UPVC material5. Ventilated systemCentrifugal fan: UPVC, 5.5KW, 0-16800r/m, 0-18500 m3/h, Air changes 0 ... of the outdoor air pipes.φ800mmSet122Centrifugal fan with adjustable speedUPVC, 5.5KW, 0-16800r/m, 0-18500 m3/h, Air changes 0 ...