Question

types
some types of respiratory protection:
● disposable masks
● half face masks
● full face masks
which respiratory protection is best, depends on:
● composition of the air
which substances are present in the air, and what are their health hazards.
● limit air concentration
the amount of dust particles permitted. this is regulated by the government.
● workplace conditions
e.g.: varying temperatures, ventilation, or lack of oxygen.
● exposure time
filters become saturated after a while; substances are let through when this is the case.
note:
● correct fit and regular maintenance are prerequisites for safe use.
● filters have a limited service life.
5
what should you bear in mind when using respiratory protection?
the mask should be regularly maintained.
filters have an unlimited service life.
the mask should fit snugly on the face.

Explanation:

The note section clearly states that correct fit and regular maintenance are prerequisites for safe use and that filters have a limited service life. So, masks should be regularly maintained and should fit snugly, and filters do not have an unlimited service life.

Answer:

The mask should be regularly maintained.
The mask should fit snugly on the face.