Muaj pes tsawg hom tshuaj tsuag lub rooj muag khoom muaj?

Thaum nws los pleev xim rau lub tsheb, lub dav hlau lossis lwm yam khoom loj, lub rooj muag tshuaj tsuag yog qhov tseem ceeb los xyuas kom meej qhov ua tiav zoo. Txawm li cas los xij, muaj ntau hom tshuaj tsuag lub rooj muag khoom, txhua tus muaj nws tus kheej zoo thiab qhov tsis zoo. Peb hom tshuaj tsuag lub rooj muag khoom tseem ceeb yog Crossflow, Down-Flow thiab Semi-Vertical Flow.