Reply to thread

Message: [QUOTE="SVCBeercats, post: 3479016, member: 7874"] Actually 50% of the plane's air is removed and the other 50% is mixed with fresh air for each cycle. Not sure if the "fresh air" at 30,000 feet contains a comfortable level of oxygen. Presumably the mixture is forced through HEPA filters, however, God knows when they were last replaced. Am I on a plane with a new filters or one with old filters near their replacement date? As for hospitals "With the advent of sealed high-rise buildings and forced ventilation, expensive negative pressure rooms have been introduced to house patients with infections thought likely to be transmitted by aerosol. The spread of tuberculosis among HIV patients was a recent dramatic example of the problems with enclosed rooms and prisons. To ensure sufficient dilution of the bacterial load around an infected patient, room air should be changed 10–12 times every hour. Actual room air changes in negative pressure rooms often fall below this level because of poor plant and maintenance." [URL='https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2843953/']Airborne transmission of disease in hospitals[/URL] [/QUOTE]