RPD Selection Information

Facial characteristics have to be considered within the suitability assessment because fit will impact the overall protection provided by the RPD. Facial characteristics which are surface-related, such as scarring, wrinkles, jewellery or unshaven hair can significantly affect the protection offered by some tight-fitting RPD. In these cases, loose-fitting respiratory interfaces may be more suitable. In this context, unshaven means hair which has not been shaved within the previous 8-hour period prior to the work shift, since studies have shown that even less than one day’s growth can dramatically increase face seal leakage.

No hair can come between the sealing surfaces of a tight-fitting respiratory interface and the wearer’s skin, or interferes with the function of the RPD, e.g. interference with the operation of valves shall not be permitted. Where any hair comes between the sealing surface, the use of loose-fitting respiratory interface, which do not rely on a tight seal in this region may be considered. Check with the manufacture for their specific guidance of facial hair and loose fitting headtops/hoods.

Tight-fitting respiratory interfaces will not provide the expected protection unless they fit the contours of the wearer’s face properly and securely. Where this type of RPD is selected for use, a fit test should be conducted to ensure that the RPD will fit the wearer correctly. If a successful fit test cannot be achieved, alternative tight-fitting respiratory interfaces should be assessed or a loose-fitting respiratory interface should be selected

Reference/s for further information and detail:

• AS/NZS 1715:2009 – Selection, use and maintenance – Section 4.4.3.1, Section 8.3 and Appendix B
• SA/SNZ TS ISO 16975.1:2023 – Selection, use and maintenance – Section 7.3.3.2 & Annex D.2.2
• AS/NZS TS ISO 16975.3:2023– Selection, use and maintenance – Fit-testing procedures