Iyi inochinjika mhepo ducting ine 2 madhayamita, 160mm uye 250mm, ese ane 10m kureba uye anogona kurongedzerwa mubhegi kuti zvive nyore kuchengetedza.Ducting inoshandura zviri nyore Bersi air scrubber B1000 uye B2000 (inotengeswa zvakasiyana) kune Negative Air Machine ine nyore, inochinjika ducting.