Source google image: https://www.airepure.com.au/wp-content/uploads/2016/09/5_Inline-HEPA-module-with-access-door-for-scan-testing-1024×1024.jpg
Q class isolation room
Source google image: https://www.airepure.com.au/wp-content/uploads/2016/09/5_Inline-HEPA-module-with-access-door-for-scan-testing-1024×1024.jpg