scope:

This standard covers recommended procedures for respiratory protection from inhalation of radon daughters, excluding pro· tection for oxygen deficiency and non·radioactive toxic contaminants.

Purpose. This standard covers recommended procedures for respiratory protection from inhalation of radon daughters, excluding pro tection for oxygen deficiency and nonradioactive toxic contaminants. Purpose. This standard is intended to serve as a guide for the preservation of health through proper selection and use of respiratory protective devices, when their use is recommended by competent authorities.