Zvinhu zve open coil ndizvo zvinonyanya kushanda zvakanaka pakupisa magetsi asi zvichiri nyore kushandisa pakupisa. Zvinoshandiswa zvakanyanya muindasitiri yekudziyisa ducts, zvinhu zve open coil zvine ma open circuits anopisa mhepo zvakananga kubva kuma suspended resistive coils. Izvi zvinhu zvekudziyisa zveindasitiri zvine nguva yekupisa nekukurumidza izvo zvinovandudza kushanda zvakanaka uye zvakagadzirwa kuti zvisanyanya kugadziriswa uye zvikamu zvinotsiva zviri nyore uye zvisingadhuri.

ZVINHU ZVAKANAKA
Kuisa kuri nyore
Yakareba zvikuru - 40 ft kana kupfuura
Kuchinjika zvakanyanya
Yakashongedzerwa nebhawa rinotsigira rinoenderera mberi rinovimbisa kuomarara kwakakodzera
Hupenyu hwebasa refu
Kugoverwa kwekupisa kwakafanana