Isahani ya coil yumuringa nigice cyingenzi mubikorwa bitandukanye byinganda, cyane cyane mubice bya metallurgy ningufu. Izi sahani zakozwe mu muringa, icyuma kiyobora cyane kizwiho ubushyuhe bwiza n'amashanyarazi. Bitewe nibi biranga, ibyapa byumuringa bikoreshwa cyane mubisabwa kuva mumashanyarazi kugeza kuri sisitemu ya HVAC. Bya S