Air Handling Unit (AHU) ndi imodzi mwazinthu zofunika kwambiri pazida zachilengedwe zomwe zimagwiritsidwa ntchito polima bowa.Bowa amadya O2 kuchokera mumlengalenga ndikupanga CO2.Tiyenera kupereka mpweya wokwanira ku bowa kuti azitha kupuma komanso kuchotsa CO2 kutali nawo.Kupatula kupereka mpweya ndi bowa, tifunika kuumitsa kapena kunyowa, kuzizira kapena kutentha mpweya zimatengera nyengo yakunja ndi kukula pang'ono.Ntchito zonsezi ziyenera kuperekedwa kwathunthu ndi AHU molongosoka.