Safety Trained Supervisor (STS) Practice Exam

What type of respirator removes specific air contaminants through a filter, cartridge, or canister?

1. An air-purifying respirator

2. A supplied-air respirator

3. A disposable respirator

4. A powered air-purifying respirator

The correct answer is: An air-purifying respirator

An air-purifying respirator is designed to remove specific air contaminants by means of filters, cartridges, or canisters. These components are integral to the device as they capture and filter out harmful particles, gases, or vapors from the air before it is inhaled by the wearer. This type of respirator is widely used in environments where air quality is compromised but particles or contaminants can be effectively filtered out. Other types of respirators serve different purposes. A supplied-air respirator, for instance, provides fresh air from a non-contaminated source rather than filtering the ambient air. Disposable respirators typically refer to lightweight masks that are meant for single use and often provide limited filtration. A powered air-purifying respirator has a battery-operated blower that forces air through the filters or cartridges, offering a higher level of protection and comfort but still relies on the principle of air purification. By understanding these distinctions, it becomes clear why an air-purifying respirator is specifically the choice that directly addresses the removal of specific air contaminants through a filtration system.