"Respirator" means a facemask that seals around the mouth and nose for the purpose of filtering all the air the wearer inhales.
Respirators can be constructed of either:
a) an elastomeric body designed to be reused many times with replaceable electrostatically-charged, glass fibre, charcoal and/or gas filters, straps, etc
b) an electrostatically-charged fabric designed to be disposed of after one or a small number of uses.
Most reusable elastomeric respirators (N95, FFP2, FFP3, P100) have exhalation valves, but some don't.
Most disposable fabric respirators (KN95, KF94, N95, FFP2, FFP3) don't have exhalation valves, but some do.
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