Choyatsira mpweya chochepetsera phokoso ndi chipangizo cha injini chomwe chimagwiritsidwa ntchito mu machitidwe a HVAC (Heating, Ventilation, and Air Conditioning) kuti chiwongolere malo a zoyatsira mpweya (ma plates olamulira mpweya) ndi phokoso lochepa. Zoyatsira mpweyazi zimapangidwa kuti zigwiritsidwe ntchito pamalo omwe kugwira ntchito chete ndikofunikira, monga maofesi, zipatala, mahotela, ndi nyumba zogona.
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