Home Improvement Expert Danny Lipford

How to Choose a Respirator or Dust Mask

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Various types of respirators and dust masks

Respirators and dust masks come in several styles and types.

Home and garden projects frequently involve exposure to harmful chemicals and toxins – such as paint fumes, solvents, dust, adhesives, pesticides, and caustic cleaning products – not to mention the annual assault from pollen and allergens. In addition to proper ventilation, a respirator or dust mask will go a long way in protecting your lungs and health.

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, either a particulate filter (dust mask) or chemical cartridge respirator are likely to be all you’ll need.

N95 and R95 particulate masks

N95 and R95 particulate masks.

Particulate Filters

Particulate filters, including disposable dust masks, are 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 not gases or vapors.

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

    Dust mask cutting grass

    Dust mask for cutting grass.

  • 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 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.
Half-mask, dual cartridge respirator

Half-mask, dual cartridge respirator.

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).

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 Chemical Cartridge Respirator Should I Buy?

To choose the right cartridge respirator, you need to know what toxins you’ll be facing. 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 it likely to contain small amounts of different substances, choose a dual-cartridge respirator with a multipurpose chemical cartridge and a P100-rated particulate filter.

Spraying insect spray

Wear a protective mask when spraying potentially harmful chemicals.

Guide to Respirators

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

Substance Type of Respirator Rating (if applicable)
Acid Gases Chemical cartridge  
Allergens Particulate filter N95 or higher
Ammonia Chemical cartridge  
Asbestos Particulate filter N100 or HE
Bacteria and Viruses Particulate filter N95 or higher
Bleach Particulate filter N95 or higher
Dust Particulate filter N95 or higher
Fibers (not asbestos) Particulate filter N95 or higher
Insulation Particulate filter N95 or higher
Lead Particulate filter N100 or HE
Mold Particulate filter N95 or higher
Organic vapor Chemical cartridge  
Paint Particulate filter R95 or higher
Pesticides, Sprays Particulate filter R95 or higher
Pollen Particulate filter N95 or higher
Sanding Particulate filter N95 or higher
Welding Particulate filter N95 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.
  • Solvents, adhesives, paints, and pesticides

    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



Please Leave a Comment

5 Comments on “How to Choose a Respirator or Dust Mask”

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  1. DFC Says:
    August 11th, 2012 at 10:22 am

    I bought a 3M R6297-M respirator(mold/lead mask) for working in my 250 square foot open dog run, my question is, are these cartridges appropriate for working in dusty conditions?, and if not, can I replace these existing cartridges with the appropriate ones?, using the same mask? Thanks

  2. chris Says:
    December 22nd, 2012 at 12:52 am

    what about spray glues? what should i use?

  3. Glenda Says:
    March 29th, 2013 at 12:03 pm

    I have an old mask for organic vapors left in my husbands dusty, dirty shop.
    Can it be washed and do I need new filters? I have no manual for it.

  4. pablo jimenez Says:
    September 21st, 2013 at 12:04 pm

    I use a particulate respirator (dust mask) for my stone cutting job but I notice at the end of the day, my nostrils are full of dust. What is going wrong?

  5. Anne Keeble Says:
    December 9th, 2013 at 11:24 pm

    Where oh where do I buy an r95 particulate filter in a shop in the uk ??

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