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Views: 0 Author: Site Editor Publish Time: 2022-04-11 Origin: Site
Respirator is designed to be worn over the nose and mouth, fitting closely to the wearer's face, and held in place by elasticated straps running behind the head. In fact, generalized diagnosis includes two types: Air-Purifying Respirators (APR) and Particle-Filtering Respirators (PFR). Then, let's introduce in detail what types of respirators.
Here is the content list:
l Respirator Types
l Air-Purifying Respirators (APR)
l Particle-Filtering Respirators (PFR)
l Vapor and Gas Filters
Two basic types of respirators are:
• air-purifying;
• supplied-air respirators.
Air-purifying respirators remove airborne contaminants such as particles, toxic vapors, and/or gases. They are appropriate for use in environments of low-level contamination
and in environments where there is sufficient oxygen.
Supplied-air respirators provide clean air from either a portable cylinder or from a remote source and are used in environments too hazardous for air-purifying respirators.
APR is divided into two types: Particulate Filtering, which removes particulates such as dust, mists, aerosols, and fumes; and Vapor and Gas Filtering, which removes vapors and gases from the air you inhale.
Air-purifying respirators (APR) are used under the following circumstances:
• the wearer is determined to be physically qualified by a doctor;
• contaminant identity and concentration are known;
• concentration of oxygen is at least 19.5%;
• work area is monitored;
• respirator is approved for protection against the specific contaminant and concentration level;
• a successful fit-test is accomplished.
There are four common classes of APR face pieces:
• disposable;
• quarter mask;
• half-mask;
• full-face.
Disposable respirators (dust masks) provide protection against nuisance dusts and particulates.
Quarter mask respirators are used with cartridges or cloth filters. The quarter mask fits from the top of the nose to the top of the chin. The breathing resistance is high in comparison to larger masks.
Half-mask respirators fit from under the chin to above the nose. One or two cartridges are used to filter the air and are discarded once the use limits are reached. The half-mask has approved cartridges for pesticides, organic vapors, dust, mists, fumes, acid gases, ammonia, and combinations of these.
Full-face respirators protect the entire face. Full-face masks use twin cartridges, chin-mounted canisters, or chest- or back-mounted canisters. All cartridges approved for the half-mask are available for the full mask. Several other cartridges are also available for the full mask.
Each cartridge is designed for use against specific contaminates. It is extremely important to know the contaminant present in the environment to make the appropriate cartridge selection.
A physical barrier to dust, mist, fumes and fibers. The simplest PFRs are disposable and fit loosely over the nose and mouth. The filter holes can easily be easily clogged, causing breathing difficulties. This makes it necessary to change the filter frequently. A single-use respirator
can protect against small amounts of non-toxic contaminants. More extreme hazards, such as asbestos fibers, require the use of respirators with replaceable filters that fit snugly over the face. PFRs cannot.
Not protect against gases/vapors or oxygen deprivation.
Gases and vapors (from liquids such as solvents) are dissolved in the air and cannot be captured by particle filters.
Gas and vapor respirators filter incoming air through one or more cartridges or canisters containing chemicals. One or more cartridges or canisters containing chemicals to filter incoming air. These chemicals absorb or chemically alter contaminants. They may also have a particulate barrier. Some respirators contain more than one type of cartridge to filter several hazardous vapors simultaneously. Cartridges are color-coded to identify the contaminants they filter.
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