Precautions For Optimizing The Supply Of Powered Air Purifying Respirators (PAPR)3

- Sep 10, 2020-

The United States Centers for Disease Control and Prevention (CDC) has issued recommendations on HCP respiratory protection, as well as the commonly used NIOSH approved, FDA approved, disposable filter mask N95 surgical respirator.

1 Based on OSHA's APF for these types of respirators, the APF is 10, and the correctly installed FFR and half-mask reusable elastic respirators are expected to reduce the concentration in the air by one-tenth. For N95 FFR or elastic half-mask respirators, all PAPR APFs exceed an APF of 10.


The United States Centers for Disease Control and Prevention (CDC) has issued recommendations on HCP respiratory protection, as well as the commonly used NIOSH approved, FDA approved, disposable filter mask N95 surgical respirator. 1 Based on OSHA's APF for these types of respirators, the APF is 10, and the correctly installed FFR and half-mask reusable elastic respirators are expected to reduce the concentration in the air by one-tenth. For N95 FFR or elastic half-mask respirators, all PAPR APFs exceed an APF of 10.


2.Compared with FFR and elastic half-mask air purifying respirators, PAPR can reduce the concentration of aerosols inhaled by the wearer to at least 1/25 times the concentration in the air. OSHA allocates 1,000 APF for certain PAPRs with hoods or helmets. However, the employer must have evidence provided by the respirator manufacturer that tests on these respirators show that the protection level is 1,000 in order to obtain an APF of 1,000. If there is no such evidence, the APF of PAPR with a loose helmet or hood is 25. Compared with FFR and half-face reusable elastic respirators, the correct use of PAPR can provide better protection and reduce the possibility of infection spread to the wearer.


There are various NIOSH approved PAPR designs to choose from. Examples include tight-fitting masks and loose hoods or helmets, blower styles, battery types (such as Li-ion, Ni-MH, Ni-Cd) or over-the-counter disposable batteries, and high-efficiency (HE) batteries. Filter or filter element. The efficiency of the HE filter on 0.3 micron particles is 99.97%. PAPR may have an adjustable air flow rate to increase comfort and provide a series of filter protection, some of which are only used for particulate matter (HE filter), others can also prevent chemical gases and vapors, which are available To help prevent gas-related hazards. Handling certain dangerous drugs and cleaning/disinfection operations.


Compared with the loosely installed PAPR approved by the National Health and Safety Administration (NIOSH), the tightly installed non-electric approved air-purifying respirator has the following advantages:


For the PAPR of loose headgear such as headgear and helmet, there is no need to conduct matching test.

PAPR with loose headgear can be used with a small amount of facial hair.

Some models provide filter elements for particle and/or gas/vapor protection.

A hooded PAPR and a helmeted PAPR may only provide important splash protection for the face and eyes.

The PAPR system assigns a protection factor (APF) of at least 25 (as mentioned above, up to 1,000 in some cases).

Some PAPRs have disposable, loose-fitting headwear so that the patient can see the face of the HCP, allowing better interpersonal communication.

Most of the PAPR components can be cleaned, disinfected, reused and shared.

PAPR only uses HE filter, which has higher filtration efficiency for the smallest pathogen particles than N95 FFR.