外壳：采用优质热镀锌钢板制成，具有优良的耐大气腐蚀性能，进风口和出风口外形尺寸相同，可与风管直接相连，以便于安装。
Housing: Galvanize steel sheet material could be able to bear corrosive. Same size for the inlet and outlet can install conveniently. Connecting to the piping directly makes for installation.
上盖采用整体拉伸成型的工艺制作而成，坚固性和外形的稳定性远远高于普通焊接成型工艺，也避免了因焊接所导致的铁板连接部位腐蚀的问题；
The upper cover is fabricated by drawing die set, with much higher strength than welding process. It also avoids the corrosion of the joints caused by welding.
外壳采用玻璃县委增强不饱和聚树脂压制而成，具有外形美观，耐腐蚀，抗静电，耐冲击及热稳定性好等优良性能；
The housings are made of glass fiber reinforced unsaturated polyester resin, with features of elegant appearance , corrosion proof, antistatic, shock resistance and favorable thermal stability.
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