Which type of respirator provides air from an outside source?

The correct choice is the supplied-air respirator, which is specifically designed to provide breathing air directly from an external source. This type of respirator connects to a source of clean air, ensuring that the user receives adequate oxygen and is protected from harmful airborne contaminants.

Supplied-air respirators are particularly useful in environments where the air quality is compromised or may contain high levels of pathogens, toxins, or other hazardous materials. This makes them ideal for use in situations such as industrial settings, during certain types of fumigation, or in areas where air purifying devices would be insufficient to ensure safety.

Other types of respirators, such as air purifying respirators, rely on filters or cartridges to remove contaminants from the air the user breathes in, which may not be suitable in all hazardous environments. Disposable respirators are typically used for minimal protection and are limited to filtering the air without providing an independent air supply. Powered air purifying respirators utilize a battery-powered blower to draw air through filters but do not supply air from an external source.