Reference

NIOSH 42 CFR Part 84 governs respirator certification in the U.S., replacing the Bureau of Mines standard in 1995. It defines the N/R/P oil-resistance classification and 95/99/100 filtration tiers. This guide covers the approval process, TC number anatomy, and step-by-step Certified Equipment List verification with a worked example.

OSHA requires a respirator under 29 CFR 1910.134 when engineering controls can't keep airborne exposure below the PEL, when a substance-specific standard mandates it, or in IDLH and emergency atmospheres. This guide covers the PEL trigger, required vs voluntary use, the written program, fit testing, APF selection, and a worked example.

OSHA 29 CFR 1910.106 limits flammable storage cabinets to 60 gallons of Class I or II liquids and requires double-walled steel construction with self-closing doors. NFPA 30 governs local fire code compliance.

OSHA Ladder Requirements: OSHA regulates portable ladders in general industry under 29 CFR 1910.23 (the 2017 Walking-Working Surfaces Final Rule) and in construction under 29 CFR 1926.1053 .

OSHA 29 CFR 1910.151 requires adequate first aid supplies in every workplace without a nearby medical facility. ANSI/ISEA Z308.1-2021 defines Class A and Class B kit contents.

OSHA 29 CFR 1910.135 requires hard hats wherever falling objects or electrical hazards exist. ANSI/ISEA Z89.1 defines Type I and Type II impact classes plus Class E, G, and C electrical ratings.

OSHA Guardrail Requirements: OSHA requires guardrail systems - or an equivalent fall protection method - on any open-sided floor, platform, or runway that is 4 feet or more above a lower level in general industry (29 CFR 1910.28), or 6 feet or more above a lower level in construction (29 CFR 1926.501).

Lockout tagout (LOTO) prevents hazardous energy releases that kill approximately 120 workers per year in the U.S. This guide covers all six hazardous energy types, the six-step LOTO procedure, lockout vs. tagout, authorized vs.

Respirator cartridge colors follow ANSI K13.1 (required by 42 CFR 84.193): black = organic vapor, white = acid gas, magenta = P100 HEPA. This guide decodes all ten color classes, combination cartridge color bands, brand-by-brand model number mapping for 3M, Honeywell North, and Moldex, and what the colors do not tell you about a.

What Happens If a Respirator Doesn't Fit: A respirator that does not seal properly against the face stops working as rated. Fit failure collapses the assigned protection factor (APF) - a half-face respirator with an APF of 10 can deliver as little as 2× protection if the face seal leaks.

Can You Reuse an N95: N95 filtering facepiece respirators (FFRs) are designated as single-use devices under NIOSH's 42 CFR Part 84 approval system. NIOSH does not approve any N95 for routine reuse.

NIOSH vs. OSHA Explained (2026 Guide): NIOSH (National Institute for Occupational Safety and Health) is a research and certification agency within the CDC that approves PPE and sets recommended exposure limits.