400mm排气扇有三种：方形、圆形和百叶窗。排气扇规格及具体参数如下：型号规格(mm)功率(w)电压(v)风量(m³/h)FA-303008022040FA-353508022043FA-4040015022048FTA-4040015038048FA-5050030022095FTA-5050030038095FA-60600600220145FTA-60600600380145FTA-75750800380230FTA-10010001500380450红色标注部分为当前介绍产品。