吸風(feng)(feng)罩(zhao)→進(jin)風(feng)(feng)管道→風(feng)(feng)機(或進(jin)風(feng)(feng)段(duan)(duan))→進(jin)風(feng)(feng)段(duan)(duan)*段(duan)(duan)濾(lv)料(liao)(liao)層(*級中(zhong)和反應段(duan)(duan))→第二級濾(lv)料(liao)(liao)層(第二級中(zhong)和反應段(duan)(duan))旋流板→出(chu)風(feng)(feng)帽蓋→排風(feng)(feng)管(或吸入段(duan)(duan)風(feng)(feng)機)。