TY JOUR TI RESEARCH OF APARTMENTS’ AIR REGIME IN THE PROCESS OF OPERATION AND RECONSTRUCTION KW ventilation KW natural ventilation KW air exchange KW PVC windows KW kitchen hood JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Tiron, O.V. AU Popov, E.N. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov