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Dust masks can provide the necessary filters from air borne dust particles from working with clays, gypsum, limestone and other materials. However, in order for dust masks to work properly, you need to make sure that you select the proper equipment and check for a well-fitted seal on the wearer. It's important to note that in some cases, it's possible that workers may not be able to effectively wear dust masks. For instance, in cases where workers have beards or sideburns, there could be an inadequate seal on the dust masks, making them ineffective from filtering dust particles. To help ensure the proper fit of dust masks, read all the accompanying literature regarding the use and precautions for the equipment.