42 CFR 84.143 - Terminal fittings or chambers; Type B supplied-air respirators; minimum requirements.
(a) Blowers or connections to air supplies providing positive pressures shall not be approved for use on Type B supplied-air respirators.
(2) Designed and constructed to provide for the drawing of air through corrosion resistant material arranged so as to be capable of removing material larger than 0.149 mm. in diameter (149 micrometers, 100-mesh, U.S. Standard sieve).
Title 42 published on 2014-10-01
no entries appear in the Federal Register after this date.