Mafani a High Volume Low Speed ​​(HVLS)Amadziwika ndi kukula kwawo kwakukulu komanso liwiro lozungulira pang'onopang'ono, zomwe zimawasiyanitsa ndi mafani a padenga lachikhalidwe. Ngakhale liwiro lenileni lozungulira lingasiyane kutengera mtundu ndi wopanga, mafani a HVLS nthawi zambiri amagwira ntchito pa liwiro loyambira pafupifupi 50 mpaka 150 revolutions pa mphindi (RPM).

Mawu akuti "liwiro lotsika" mu mafani a HVLS amatanthauza liwiro lawo lozungulira pang'onopang'ono poyerekeza ndi mafani achikhalidwe, omwe nthawi zambiri amagwira ntchito pa liwiro lalikulu kwambiri. Ntchito yothamanga pang'ono imeneyi imalola mafani a HVLS kusuntha bwino mpweya wambiri pamene akupanga phokoso lochepa komanso kugwiritsa ntchito mphamvu zochepa.

Liwiro lozungulira la fan ya HVLS lapangidwa mosamala kuti liwongolere kuyenda kwa mpweya ndi kuyenda kwake m'malo akuluakulu monga m'nyumba zosungiramo katundu, malo opangira zinthu, m'malo ochitira masewera olimbitsa thupi, ndi m'nyumba zamalonda. Mwa kugwira ntchito pa liwiro lochepa komanso kusuntha mpweya mofatsa komanso mosasinthasintha,Mafani a HVLSZingapangitse malo abwino komanso opumira mpweya wabwino kwa okhalamo pomwe zimachepetsa kugwiritsa ntchito mphamvu ndi ndalama zogwirira ntchito.