air valve,air damper Size:80mm-1600mm Material:Stainless steel Galvanized steel Tpye:Handy or Electric

air valve,air damperSize:80mm-1600mmMaterial:Stainless steel Galvanized steelTpye:Handy or Electric

Yuyao Dongfang ventilation Engineering Co., Ltd is specialized in producing spiral pipe(Sprial ducts) and accessories. (Beijing 2008 Olympic Games spiral pipe product supply). We have the most advanced companies Switzerland SPIRO full metal spiral duct and accessories production lines Products are widely used in air conditioning, airports, shipbuilding, exhibition, Coliseum .,etd

air damper/air valve