When scuba meets Covid-19! The APA with a certified and properly installed filter, can assist in the filtration of breathable air and reduce the inhalation of contaminants.
APA adaptor has a non-return valve, so only fresh air passes through the filter and only filtered air enters into the mask.
The exhausted air has a different channel and it is expelled from the lower part of the mask, where another non-return valve ensures air will only exit from there. https://oceanreefgroup.com/covid19/
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