Makarenko, Luibov. “An Air Cleaner Model With HEPA 11 Filter Inserts and a Heat Exchanger for Heating the Outside Air in the Recirculation Section”. International Science Journal of Engineering & Agriculture 3, no. 2 (April 1, 2024): 67–77. Accessed July 3, 2024. https://isg-journal.com/isjea/article/view/653.