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|Air-line respirators (also called an air-supplied respirator or supplied air respirator, SAR). The respirator is connected to a stationary source of compressed breathing air source by a hose. The air is delivered continuously or intermittently in a sufficient volume to meet the wearer's breathing requirements. Obviously, the user is restricted by the length of the hose connection, and the dangers of damage to the hose. Also see this OSHA article, Deaths Involving the Inadvertent Connection of Air-line Respirators to Inert Gas Supplies.
|Self-contained breathing apparatus (SCBA). This is much like the apparatus a SCUBA diver or fire fighter might use. Air is supplied from a compressed cylinder, usually through a full-face mask, which is worn on the back. This gives greater movement than an air-line respirator, but the air supply is limited.|
|Combination respirators have a small, auxiliary self-contained air supply that can be used if the primary supply fails.|
In addition, these cartridges/canisters usually do not include any method of indicating when their ability to remove air contaminants has been reduced. Read the manufacturer's instructions for cartridge maintenance and replacement or see the OSHA link below.
There are three basic kinds of air-purifying respirator:
|Particulate respirators use a mechanical filter to remove particulate matter such as dusts. Do not assume that your respirator removes particulates or vapors; READ the labels and manufacturer's instructions. NIOSH strongly recommends that any particulate devices approved under 30 CFR part 11 be replaced by those approved under 42 CFR part 84.|
|Gas and vapor respirators (or chemical cartridge respirators) use chemicals such as activated charcoal to remove specific gases and vapors from the air. These are effective for concentrations of no more than ten times the TLV of the contaminant, if the contaminant has warning properties (odor or irritation) below the TLV.|
|Combination respirators have filters for both particulates and vapors.|
Powered air-purifying respirators (PAPR) (not shown) use a blower to force the ambient air through air-purifying elements to the inlet covering.
Safety posters are a terrific way of reminding employees of proper procedure. Get yours at Safety Emporium.
Keep in mind the following facts about respirators:
See also: asthma, emphysema, fume hood, respiratory.
Additional definitions from Google and OneLook.
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