Many factors influence how long PPE (especially respirators) re- mains effective. As well as hours of use, an air-purifying respira- tor’s service life is affected by the concentration of dust and other contaminants in the enviroment; the user’s body size; how strenu- ously the user works while the respirator is worn; and how the res- pirator is stored.
Note: As a result, it’s not possible to specify a length of time after which a respirator should be replaced.
In general, replace a mask or filter when it is visibly dirty or dam- aged, or when you experience difficulty breathing through it. Re- place respirator cartridges when you can smell or taste chemical while or after using the respirator, or according to the manufactur- er’s recommendations. Replacement or repairs shall be done only by experienced person with parts designed for the PPE. No at- tempts shall be made to replace components or to make adjust- ments or repairs beyond the manufacturer’s recommendations.
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