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.
Respirators are used to purify the air you are breathing. The most common respirator is a half face, dual cartridge respirator. Respirators must be equipped with HEPA filtered cartridges (color coded purple) or an N-100, P-100 or R-100 NIOSH rating. These cartridges are specific for filtering out asbestos fibers. Paper dust masks available at hardware stores do not filter out asbestos fibers and should not be used. Half face respirators cover the nose and mouth and consist of a silicone or rubber face piece, elastic head harness and filter cartridges. Respirators provide little protection if they do not fit properly.