How to choose a dust mask?

In addition to proper ventilation, understanding how to choose a respirator or dust mask will go a long way toward protecting your lungs and health.

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Home and garden projects frequently involve exposure to harmful chemicals and toxins &#; such as paint fumes, solvents, dust, adhesives, pesticides, and caustic cleaning products. This is in addition to the annual assault homeowners face from pollen and allergens. So, it&#;s important to wear protection and get a reliable respirator or dusk mask before you tackle these types of projects. 

Respirators and dust masks aren&#;t all the same &#; there are different kinds to choose from, as well as a rating system for efficiency. At home and around the workshop, a particulate filter (dust mask) or chemical cartridge respirator should be all you&#;ll need.

Particulate Filters

Disposable dust masks are particulate filters, the most common type of air-purifying device for home use. Particulate filters can be disposable or reusable with replaceable filters. They cover your nose and mouth and provide protection from airborne particles &#; including dust, mists, liquids and some fumes &#; but they don&#;t protect you from gases or vapors.

Particulate filters are rated by the National Institute of Occupational Safety and Health according to what, and how much, they filter out. The rating has both a letter and number:

• N: Not oil-proof
• R: Oil resistant (up to 8 hours)
• P: Oil-proof (beyond 8 hours)
• Number: Particulate filters are rated 95, 97 or 100, which corresponds to the percentage of one-micrometer particles removed during clinical trials. A 95 rating means that the filter removes 95% of particles from the air. Filters rated 100 are considered High-Efficiency (HE or HEPA) filters.

What Type of Particulate Filter Should I Buy?

The most common rating for disposable dust masks is N95, which will filter 95% of airborne particles that are not oil-based. N95 covers most woodshop dust, allergens, and airborne diseases. Filters for painting are often rated R95, or higher to handle oil-based particles.

If you&#;re looking for the highest level of protection in the widest variety of situations, go for P100, which will filter out 100% of both oil-based and non-oil-based particles.

When choosing a dust mask, consider:

• Masks with an adjustable nosepiece offer a tighter fit.
• Disposable masks with foam face seals will be more comfortable and a little more effective.
• Masks with an exhalation valve will make breathing easier.
• For highly toxic particles (such as asbestos), choose a non-disposable mask with sealing gaskets.

Chemical Cartridge/Gas Mask Respirators

Chemical cartridge respirators contain special carbon-filtering material that absorbs gases and vapors from the air.

The replaceable cartridges are inserted in a mask that seals tightly around the edges to block out unfiltered air.

Cartridge respirators may be half-mask (covering only your nose and mouth) or full-face (for protection against chemicals that irritate the skin).

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Chemical cartridge filters include:

• Chemical Cartridge: Block out vapors, but don&#;t have a separate prefilter to remove particles.
• Dual Cartridge: Include a replaceable pre-filter for particulates, giving you both types of protection. The particulate pre-filter will be rated just like any other particulate filter (see above).
• PAPR (Powered Air-Purifying Respirator): Have a battery-powered fan that blows air through the filter to make breathing easier.

What Type of Chemical Cartridge Respirator Should I Buy?

Before you can choose the right cartridge respirator, you need to know what toxins you will face. The cartridges are color-coded for specific purposes (such as organic vapors, ammonia, mercury, or acids).

If you don&#;t know, or if your project is likely to contain small amounts of different substances, choose a dual-cartridge respirator with a multipurpose chemical cartridge and a P100-rated particulate filter.

Guide to Respirators

The following chart will help you decide what kind of respirator you need:

SubstanceType of RespiratorRating (if applicable)Acid GasesChemical cartridge AllergensParticulate filterN95 or higherAmmoniaChemical cartridge AsbestosParticulate filterN100 or HEBacteria and VirusesParticulate filterN95 or higherBleachParticulate filterN95 or higherDustParticulate filterN95 or higherFibers (not asbestos)Particulate filterN95 or higherInsulationParticulate filterN95 or higherLeadParticulate filterN100 or HEMoldParticulate filterN95 or higherOrganic vaporChemical cartridge PaintParticulate filterR95 or higherPesticides, SpraysParticulate filterR95 or higherPollenParticulate filterN95 or higherSandingParticulate filterN95 or higherWeldingParticulate filterN95 or higher

Respirator Safety Tips

• Notice Smells: Change the filter if you notice any changes in smells or taste; or if your throat, nose, or lungs become irritated.

Wear a protective mask when using chemicals.

• Breathe Easy: You should also change your respirator if it becomes clogged and hard to breathe through.
• Keep Dry: Many respirators, especially disposable ones, become ineffective if they get wet.
• Follow Instructions: Replace filters as instructed on the package.
• Don&#;t Reuse: Disposable respirators aren&#;t meant to be used more than once.
• Throw Away if Broken: Discard any respirator or filter canister that is dirty or damaged. Replace gas masks if rubber seals are damaged.

Further Information

Differences Between Masks and Respirators

It is a common misconception that respirators and masks provide the same type of protection. Respirators can help protect you while you breathe in by filtering out small and even microscopic particles in the air, whereas cloth and single use masks are more about protecting those around you from large particle droplets as you breathe out, cough or sneeze. 

Simple cloth face masks and coverings do not form a tight seal around your mouth and nose, limiting their ability to protect you from germs that may be in the air, since particles can leak in around the edges. However, these masks still help to slow the spread of airborne viruses because they offer a barrier that helps keep germs and large particle droplets from reaching other people as you talk, cough or sneeze.  

Contrary to masks, respirators are tested and approved by the National Institute for Occupational Safety and Health (NIOSH), a division of the Centers for Disease Control. For NIOSH to approve a respirator, it must be able to capture and filter particles of varying sizes, including those so small you can't see them (like viruses and bacteria). Unlike cloth masks or surgical masks, respirators feature a tight seal to the face, and are made of a specially woven and statically charged fabric that filters 95 to 99.7 percent of all air particles as you breathe.

Paper dust masks are designed to reduce exposure to solid particles like dirt, silica and pollen. Dust masks are not National Institute for Occupational Safety and Health (NIOSH)-approved disposable filtering facepieces. Dust masks are not true respirators and do not offer protection against hazardous dust, gases or vapors. If the dust mask does not have a valve in the front and is made of paper instead of non-woven polypropylene fiber, it&#;s not a respirator. These simple masks can be worn during activities like mowing, gardening, sweeping and dusting.

True respirator masks such as N95 respirators are designed to protect the wearer from airborne particles and from liquid contaminating the face. They filter at least 95 percent of airborne particles such as dust, mists and fumes. These masks are approved by NIOSH because they effectively block out particulates down to .3 microns and large droplets won&#;t pass through the barrier. N95 respirators do not protect against oil-based particles. 

If you want further info on the differences between respirators and masks, check out this guide.

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