Reference

Noise exposure is not the loudest reading of the day - it is a time-weighted average of every level a worker meets. This guide shows you how to calculate noise exposure: building an 8-hour TWA, computing dose with OSHA's 90 dBA PEL and 5 dB exchange rate, comparing it to the 85 dBA action level, and where the NIOSH 3 dB rate differs.

Tie off without enough room below you and the system stops you only after you have already hit the ground. This guide shows how to calculate fall clearance step by step - free fall, deceleration, worker height, D-ring shift, and safety factor - with worked numbers for a shock-absorbing lanyard versus an SRL under OSHA 1926.502.

Carbon monoxide detectors do expire, because the electrochemical CO sensor inside has a finite life and degrades whether or not the alarm has ever sounded. UL 2034 governs these alarms and requires an end-of-life warning. This guide covers sensor lifespan, the date code on the back, the end-of-life chirp, and a worked replacement example.

Ionization and photoelectric smoke detectors sense different fires at different speeds, and NIST's full-scale testing shows the gap can be a survival margin. This guide covers how each sensor works, the UL 217 8th Edition tests that reshaped the market in 2024, NFPA 72 placement rules, and a worked five-alarm plan for a two-level home.

Where you install smoke detectors decides whether the alarm wakes you in time, and NFPA 72 sets the placement rules many homeowners and facility managers get wrong. This guide covers every required location, ceiling versus wall mounting, sloped ceilings, and the clearances that prevent nuisance alarms, with a worked two-story-house example.

Fire extinguisher inspection runs on a fixed cadence: a monthly visual check, an annual maintenance by a qualified servicer, and hydrostatic testing every 5 or 12 years by extinguisher type, under OSHA 1910.157 and NFPA 10. This guide explains each interval, who performs it, how to document the tag, and walks a worked example for a facility.

Fire extinguisher placement requirements set how far a worker may travel to reach a unit and how high it may be mounted, and getting either wrong is a common OSHA citation. This guide breaks down the NFPA 10 travel-distance limits by class, the mounting-height and clearance rules, OSHA 1910.157 accessibility, and a worked facility example.

Fire extinguisher types describe the agent inside — dry chemical, CO2, water, wet chemical, clean agent, or dry powder — a separate decision from the A-B-C-D-K fire class on the label. This guide explains each agent, the classes it is rated for, and its residue under NFPA 10, plus a worked facility example.

Fire extinguisher classes (A, B, C, D, and K) tell you which fires a unit can safely fight, and using the wrong class can spread a fire instead of stopping it. This guide decodes every class under NFPA 10, explains the numerical A and B ratings on the label, covers the PASS discharge method, and walks a worked example of equipping a workshop.

Most workplace fires start small enough to stop with a portable extinguisher, but only when you pick the right class and use it correctly. This guide explains the PASS method step by step, decodes fire classes A through K, walks through a real ABC unit, and covers the OSHA training rule and when to evacuate.

A PAPR uses a blower to push filtered air into a hood or mask, giving higher protection and far more comfort than a tight-fitting respirator, often without a fit test. This guide explains how a powered air-purifying respirator works, its assigned protection factor, how it compares to half- and full-face respirators, and who actually needs one.

Fluorescent yellow-green and orange-red are both ANSI-compliant hi-vis colors, but they are conspicuous against different backgrounds, which makes the color a real safety choice. This guide explains hi-vis color meaning, how the background colors and retroreflective tape work together, and which color to choose by environment.