Mpweya wolowera m'malo mwa mpweya wakale komanso woyipa m'nyumba yokhala ndi mpweya wabwino wakunja.Poyerekeza ndi mpweya wabwino wachilengedwe, makina opangira mpweya wabwino amatha kutulutsa mpweya wokhazikika kuti uwongolere kutentha kwamkati ndi chinyezi.Poyikidwa ndi makina osewerera, makina olowera mpweya amatha kuchotsa tizilombo toyambitsa matenda, tinthu tating'onoting'ono, mpweya, fungo ndi nthunzi kuti zikhale zabwinoko.
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