Heart rate is measured by counting the number of beats per minute. Someone's normal heart rate depends on things like the person's age and whether he or she leads an active lifestyle. The resting heart rate decreases as people get older. Typical normal resting heart rate ranges are: 1  babies (birth to 3 months of age): 100â150 beats per minute. 2  kids 1â3 years old: 70â110 beats per minute. 3  kids by age 12: 55â85 beats per minute.
A respirator is a piece of protective respiratory equipment designed to protect the wearer from inhaling harmful particulate matter (as in dusts, including airborne microrganisms), fumes, vapors, or gases.
APFs are numbers that indicate the level of workplace respiratory protection that a respirator, or class of respirators, is expected to provide to employees when used as part of an effective respiratory protection program.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).