Chingwe duct itha kugwiritsidwa ntchito popereka gasi pansi pa mpweya wamagalasi. Payipi yotere imakhala yozungulira kapena yozungulira, ndipo imatha kukana gasi owonongera, monga mpweya wa chlorine, mpweya wa flue, etc.
Kukula: Makonda
Model: Kuzungulira, amakona anayi, mawonekedwe apadera, mwamakonda, etc.