Respirators must be properly selected and fitted to provide protection to the user. It is the responsibility of the user to make the appropriate choice of respirator based on the contaminant, workplace concentrations, and any other site specific conditions. It is also the responsibility of the user to ensure that the workplace is in compliance with all applicable Federal, State, and Local regulations on worker safety, including, but not limited to, OSHA regulations on respiratory protection (29 CFR 1910.134). Read all Warnings and Use Instructions that accompany the respirators. If you have any Technical questions regarding respiratory protection, call Moldex at 800-421-0668 or 3M at 1-888-364-3577.