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Tips for buying Air-Purifying Respirator

Facilities should select a respirator that is comfortable and provides adequate protection for the duration of its use. The selected type must be compatible with any eye and face protection, corrective lenses, hearing protection, and protective head cover.
Facilities should consider the following factors when selecting respirators: the types of contaminants and their concentrations and relative toxicity, as well as compliance with applicable regulations; the physical circumstances of the user; the environmental conditions; the length of time protection is required, and the kinds of activity that need to be carried out while the device is being worn.
Other important factors to be considered include: product availability, ease-of-use, reliability, and the service and technical assistance history of the manufacturer.
When using the respirator, users should have a wide field of vision and the ability to communicate freely with others without having to remove the device.
Facilities are encouraged to select respirators that allow the use of cartridges, canisters, and filters from more than one manufacturer. These accessories have a significant replacement cost over the lifetime of a respirator.
Some face pieces can be used in both air purifying and air supplying devices. This is beneficial for facilities that require the use of both types of respirator.
Facilities should use the HR to determine the minimum APF needed. APF must be greater than or equal to the calculated HR.
A full-face elastomeric negative-pressure or chemical-resistant is recommended if a chemical can be absorbed through the skin and eyes.
Facilities should select a lightweight respirator with little or no breathing resistance, such as a PAPR, for conditions of strenuous work, long periods of use, or high heat and humidity. When a PAPR is required, it is recommended to test the flow rate of the unit using the protocol supplied by the manufacturer. A tight fitting unit should provide a flow rate of 4 cfm, while a loose-fitting face piece, helmet, or hood should have airflow of at least 6 cfm.
In oxygen-deficient and/or IDLH atmospheres, or when the contaminant and/or concentration are unknown, it is recommended to use an atmosphere-supplying respirator. Facilities purchasing such a respirator should verify an airflow rate of 4-15 cfm for a tight fitting face piece, while a loose fitting face piece, helmet, or hood should maintain an airflow rate of 6-15 cfm. During use of an atmosphere-supplying respirator, users should ensure that the length and position of the air-line do not affect mobility or pose a tripping hazard.
Buying a replacement part - such as a gas cylinder, a battery, a face piece, or a visor - may be significantly cheaper than replacing the entire respirator. Facilities should look for manufacturers who provide fit testing or any other support with the purchase of a respirator.

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