Minn. R. 4731.2280
USE OF HIGHER ASSIGNED PROTECTION FACTORS
A licensee must obtain authorization from the commissioner before using assigned protection factors in excess of those specified in part 4731.2700 . The commissioner may authorize a licensee to use higher assigned protection factors on receipt of an application that: A. describes the situation for which a need exists for higher protection factors; and B. demonstrates that the respiratory protection equipment provides these higher protection factors under the proposed conditions of use.