The illustration shows a generic example of a box plot with the maximum, third quartile, median, first quartile, and minimum values labeled. The relative vertical spacing between the labels reflects the values of the variable in proportion.
Respirator Types Two basic types of respirators are: â¢ air-purifying; andâ¢ supplied-air respirators. Air-purifying respirators remove airborne contaminants such as particles, toxic vapors, and/or gases.
Different types of respirators offer different levels of protection. The measure of a respirator's protection capability is called the Assigned Protection Factor or APF. This is a number that OSHA has assigned to each class of respirators.