Phokoso lochepa, zomwe zimapangitsa kuti malo ogwirira ntchito azikhala abwino kwambiri. Chojambulira cha magawo awiri chimagwira ntchito pa liwiro lochepa, ndipo ndi malo otsekedwa bwino osamveka bwino, phokoso logwirira ntchito limakhala lochepa mpaka 68-72 decibels, zomwe zimachotsa phokoso loopsa komanso zimapangitsa kuti ntchito ikhale yabwino.
Mpweya waukulu womwe umafunika kuti ukwaniritse kufunikira kwa mpweya wapakati. Ndi mpweya wosunthika wa 5-100 m³/min, ndi woyenera kwambiri kuperekedwa kwa mpweya wapakati m'mafakitale, m'mizere ikuluikulu yopangira, komanso m'malo omwe amagwiritsa ntchito mpweya wambiri monga nsalu, zamagetsi, ndi mankhwala.
