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.
Once the new rule takes effect, employers will be required to use the protection factors in the APF table to select the appropriate type of respirator based upon the exposure limit of a contaminant and the concentration of the contaminant in the workplace.he new final rule takes effect on November 22, 2006. It includes a table of APFs (attached to this message) for the four basic types of respirators -- air-purifying respirator (APR), powered air-purifying respirator (PAPR), supplied-air respirator (SAR), and self-contained breathing apparatus (SCBA).