Spread of infectious agents through the air in complex spaces.

Interface Focus · 2022 · PMC8831084 · PMID 35261735

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may be significantno p-value reported

The environmental cost in maintaining natural ventilation may be significant since it requires heat (or cooling) to promote a ventilation exchange flow.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.