It has its own air supply, hose in back
they cant even get masks..there cant be that many of those things in a hospital.
UK
Boris Johnson revealed he had tested positive for the disease after developing a temperature and persistent cough.
Shortly afterwards, Health Secretary Matt Hancock confirmed that he too had been diagnosed with the virus and was working from home.
Chief Medical Officer Chris Whitty, who advised the PM to take a test after examining him on Thursday afternoon, then revealed he was self-isolating after developing symptoms.
The triple blow came as the NHS braced itself for an onslaught from the virus in the coming days.
14,569 cases, 759 deaths, 6200 hospitalized
PAPR: Powered Air Purifying Respirators
They do not have their own air supply (say from a tank) - but they run the room air through a filter using a pump from the back. The pump helps to create a positive pressure inside the hood to keep the virus from getting into the hood, but it isn’t a true pressurized system. The filters are much better than the N95 masks. You can use different types of filters, not sure how small of a particle they go down to.
I’m guessing that the pump and noise air is part of the problem with being able to hear. I’m hoping that they have teams of folks that have worked together for awhile and know their stuff. I used to work for two carpenters - they would work together and could go an entire day practically without saying a word to each other!