Five ways to avoid catching Covid indoors
This is no problem for a quick visit but may be a risk over a period of hours.One customer was "pre-symptomatic" - in other words, he was infected but did not realise because he had yet to develop symptoms.
You're relying on a ventilation system in which stale air is extracted from the rooms and piped to an air handling unit, often on the roof.There, fresh air can be pulled in from outside and mixed with the old inside air, before being sent back into the building."Having 100% outside air or close to 100% is a good thing," says Prof Cath Noakes of the University of Leeds and chair of the environmental panel of the government's SAGE advisers, speaking in a personal capacity.
The drawback to running 100% fresh air is the cost - the incoming air has to be heated in winter and cooled in summer, all of which requires energy.A modern ventilation system will have filters but these are not fool-proof. In South Korea, a call centre on the 11th floor of an office building saw one person infect more than 90 others.
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