N/A Respirators are not approved for use in any atmosphere immediately dangerous to life or health or from which the wearer cannot escape without the aid of the respirator. Before using any respirator, make sure that any airborne contaminants are not in concentrations that are in excess of those allowed by applicable OSHA or EPA regulations or NIOSH recommendations. Consult the product literature and owner's manuals for information concerning the proper function, use, and maintenance of these respirators.