Gerson 1750 N99 Particulate Respirator – NIOSH Approved, Molded Cup, Made in USA (Box of 20) Pack Size:Box of 20 the semi-rectangular 7407 adds surface

the semi-rectangular 7407 adds surface area for easier breathing

the Kevlar liner is exposed or frayed

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Gerson 1750 N99 Particulate Respirator – NIOSH Approved, Molded Cup, Made in USA (Box of 20) Pack Size:Box of 20 the semi-rectangular 7407 adds surfaceEDITORIAL REVIEW Gerson 1750 N99 Judged on the published NIOSH designation, the protection factor OSHA actually assigns it, and how the format fits a working shift. Assessed by Steven Eaton, WC Safety editor. An air purifying respirator filters air; it does not supply any. Under 29 CFR 1910. 134 no filtering facepiece may be used in an atmosphere that is IDLH or oxygen deficient (below 19. 5% oxygen). Those conditions require a supplied air respirator