Final answer:
Powered Air-Purifying Respirators (PAPRs) use a blower to filter and supply purified air to a full facepiece, essential in high-risk environments like BSL-4 labs where HEPA filters help prevent airborne transmission of pathogens.
Step-by-step explanation:
The types of respiratory protection that use a blower to pass contaminated air through a canister or filter to remove the contaminant and supply the purified air to the full facepiece are known as Powered Air-Purifying Respirators (PAPRs). These respirators are part of the personal protective equipment designed for workplaces where air quality cannot be assured. They are commonly used in environments like Biological Safety Level (BSL) laboratories, where workers may be exposed to infectious agents. As such, PAPRs can be critical in BSL-4 labs, where the most dangerous pathogens are handled and HEPA filters are used extensively to prevent airborne transmission of microbes.