Dust masks just don't provide a good face seal and they protect about as well as nose hair, which is to say not that well. Replace them when they look dirty or after about 8 hours of wear. Honestly they're not doing much anyway, so it won't matter. What we sell for actual lung protection are disposable respirators.
Subsequently, one may also ask, do n95 masks protect against flu?
Respirators. Respirators, also called N95 respirator masks, are designed to protect the wearer from small particles in the air that may contain viruses. Overall, respirators are considered much more effective at preventing the flu virus than regular facemasks.
What does the n95 mean?
The N95 respirator is the most common of the seven types of particulate filtering facepiece respirators. There are some products that are approved by NIOSH as an N95 respirator and also cleared by the Food and Drug Administration (FDA) as a surgical mask. These products are referred to as Surgical N95 Respirators.
Do n95 masks protect against asbestos?
Simple dust masks do not provide sufficient protection against asbestos fibers/dust. This is one reason that homeowners should not undertake asbestos removal on their own; in order to be fully protected from asbestos dust, a special respirator equipped with an appropriate HEPA filter is generally required.