A review of heat recovery technology for passive ventilation applications Bobur Shodiyev, Nizomjon Usmonov, Alisher Davirov, Rakhimjon Kobilov and Rano Tukhtaeva E3S Web Conf., 434 (2023) 01034 Published online: 12 October 2023 DOI: 10.1051/e3sconf/202343401034