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It is rated NRR 25 dB under ANSI S3
3 oz for the X2A
ammonia (N75004L)
A higher number means more firefighting capacity for that class
MSA Advantage 420 Half-Mask Respirator Size:Large It is rated NRR 25Short answer: the msa advantage 420 half mask respirator is covered below on the specifications its own listing publishes, the standards it is certified to, and who it suits. Complete guide: MSA Safety Respirators: Complete Buyer's Guide (2026) EDITORIAL PICK 4. 8 5 The MSA Advantage 420 delivers genuine silicone sealing quality at a mid range price point. AnthroCurve geometry and a seam free UniBond facepiece separate it from economy half masks
