What are the advantages and disadvantages of the . versus the .? What questions should you ask prior to selecting a respirator?

Two types of respirators discussed in class this week are air-purifying respirators known as and supplied-air respirators known as . Air-purifying respirators utilize special filters to target specific types of hazardous particles such as fumes, dust and mist. In contrast supplied-air respirators offer protection from hazards by supplying air directly to the subject. This is accomplished taking air from a secure container separate from the contaminated area through mask and tubing. Supplied-air respirators offer the highest level of protection against contaminants however their bulkiness brings additional safety concerns and are often very...