NIOSH Items: We only sell brand new respirators, filters, and dust masks from US based manufacturers. Since it can be difficult to determine if a respirator or mask has been used or even just tried on, for the protection of our customers, we do not accept NIOSH returns.
The 3M 2091 P100 (HEPA) Filter is sold by the pair and features extremely fine filtration that traps all but the most minuscule particles. The 3M 2091 P100 Filters fit on the 3M 6000 Half Face Respirator and the 3M 7500 Respirator, as well as the 3M 6000 Full Face Respirator. HEPA filtration is rated to remove 99.9% of particles .3 microns and larger. This includes most welding fumes (burnt metal), toxic dusts like asbestos and lead, and folks with allergies to many environmental dusts. We recommend using an asbestos mask if you are working on the heating vents or ducts, popcorn ceilings, automotive brake linings, or pipe insulation.
Sometimes called a 3M P100 pancake filter, they are attached directly to the mask. A simple 1/4 turn locks them on. No retainers or other attachment methods are needed. Our customers use them to protect against asbestos and lead dusts in particular, as well as a host of other dusts, allergens, and fumes. The filters are extremely lightweight and flexible, and they fit tight against the mask, which makes wearing this type of mask a bit more comfortable.
*If the hazard is mold, or if you are arc welding, then we would suggest the 3M 2097 P100 HEPA Filter that has a layer of charcoal. Active mold growth produces Volatile Organic Compounds (VOCs) that won't be absorbed by the 2091. Arc welding produces ozone, which also won't be absorbed.