Before you begin. This procedure is general reference information, not professional advice. Equipment varies by manufacturer, model, and year. Always follow the documentation supplied with your equipment — where it differs from this page, follow the manufacturer. Verify that you have the tools, the working conditions, and the ability to do this task safely. If anything is unclear, if the equipment is damaged, or if the task exceeds your experience, stop and use a qualified professional. You are responsible for your own safety and for the outcome. This site accepts no liability for any loss, damage, or injury arising from the use of this information.
Specifications marked unverified could not be traced to a manufacturer source. Do not rely on them — obtain the value from your equipment documentation.
Summary
A disposable dust mask, often sold as an N95, is the everyday answer to sanding, sawing, cutting and grinding dust from a power tool. Not every dust mask on a shelf is actually NIOSH-approved, and a growing number of counterfeit N95 masks carry a printed approval number that does not exist on the government's own list. This page shows how to pick a filter class for the job, and how to check a respirator's approval number before you trust your lungs to it.
Is a dust mask enough? For ordinary wood, drywall and household dust, a genuine N95 usually is. For concrete, brick or stone dust, the hazard often includes silica, and heavy or long exposure can call for more than a simple disposable respirator and a professional judgment call. This page does not cover gas masks, cartridge respirators or supplied-air equipment, and it does not replace a workplace respiratory protection program where one applies.
Safety
DO NOT WEAR A DISPOSABLE RESPIRATOR AROUND A GAS OR A VAPOR.
A disposable respirator only filters particles. A paint fume or a solvent fume can harm you.
Necessary equipment
| Item | Note |
|---|---|
| Disposable respirator | NIOSH calls this device a filtering facepiece respirator. |
| Device with internet access | You use this device to search the NIOSH Certified Equipment List. |
| Mirror optional | You use a mirror to look at the fit of the respirator on your face. |
| Clean storage bag material | A clean bag keeps a spare respirator free of dust between tasks. |
Find the dust hazard from the tool
Estimated 4 min
NEVER CUT OR SAND A MATERIAL THAT CAN CONTAIN ASBESTOS OR LEAD PAINT.
A disposable respirator does not give enough protection for these materials. They can injure your lungs permanently. Ask a certified professional to identify the material first.
- Find the material that the tool will cut, sand or grind.1mReport a problem with step 1, Find the dust hazard from the tool
- Find the type of dust the material makes.2mReport a problem with step 2, Find the dust hazard from the tool
- Wood, drywall and general household dust are a nuisance dust hazard.
- Concrete, brick, stone and tile dust can contain silica.
- Read the product label for a hazard warning.1mReport a problem with step 3, Find the dust hazard from the tool
- Some treated wood and some manufactured board release more than dust.
Select the filter class
Estimated 3 min
No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.
- Select the N95 class for ordinary wood, drywall or metal dust.1mReport a problem with step 1, Select the filter class
- N95 filters at least 95% of particles.
- N95 gives no protection from a gas or a vapor.
- Select the N100 class for very fine dust or a long task.1mReport a problem with step 2, Select the filter class
- N100 filters at least 99.97% of particles.
- A higher number gives more filtration and can cost more.
- Select the P100 class if the task also makes an oil mist.1mReport a problem with step 3, Select the filter class
- The letter shows the resistance to an oil mist.
- N means no resistance to an oil mist.
- R means some resistance to an oil mist.
- P means a strong resistance to an oil mist.
Make sure the respirator is genuine
Estimated 6 min
No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.
DO NOT WEAR A RESPIRATOR WITH NO TC APPROVAL NUMBER.
A fake respirator can filter less dust than the label claims. Dust can then reach your lungs and injure them.
- Find the TC approval number on the respirator or the headband.1mReport a problem with step 1, Make sure the respirator is genuine
- Search the number on the NIOSH Certified Equipment List.2mReport a problem with step 2, Make sure the respirator is genuine
- The list is the record NIOSH keeps of every approved respirator.
- Read the label on the respirator.2mReport a problem with step 3, Make sure the respirator is genuine
- A genuine label shows the maker name and the NIOSH name.
- NIOSH must have the correct spelling and capital letters.
- A genuine label shows the model number and the TC number.
- A genuine label also shows a lot number.
- Look at how the respirator fits on the head.1mReport a problem with step 4, Make sure the respirator is genuine
- A genuine respirator has two head bands, or ear loops with a fastener.
- An ear loop with no fastener behind the head is a warning sign.
- Do not buy a respirator with decoration such as sequins.
- NIOSH does not approve a respirator made for children.
Fit the respirator to your face
Estimated 4 min
DO NOT WEAR A DISPOSABLE RESPIRATOR OVER FACIAL HAIR THAT CROSSES THE SEAL.
Facial hair breaks the seal between the respirator and your face. Unfiltered dust can then reach your lungs and injure them.
- Read the fit instructions printed on the package.1mReport a problem with step 1, Fit the respirator to your face
- Hold the respirator against your face.<1mReport a problem with step 2, Fit the respirator to your face
- Press the nose piece to the shape of your nose.<1mReport a problem with step 3, Fit the respirator to your face
- Pull one head band over the crown of your head.<1mReport a problem with step 4, Fit the respirator to your face
- Pull the other head band to the base of your neck.<1mReport a problem with step 5, Fit the respirator to your face
- Breathe out hard and look for air at the edges of the seal.<1mReport a problem with step 6, Fit the respirator to your face
- Adjust the respirator again if you feel air at the edges.
Wear the respirator while you work
Estimated 2 min
DO NOT USE A DISPOSABLE RESPIRATOR IN A SPACE WITH LOW OXYGEN.
A disposable respirator supplies no oxygen to you. Low oxygen can injure you or can kill you.
- Put the respirator on before you start the tool.<1mReport a problem with step 1, Wear the respirator while you work
- Keep the respirator on your face until the dust settles.<1mReport a problem with step 2, Wear the respirator while you work
- Leave the work area if breathing becomes hard.<1mReport a problem with step 3, Wear the respirator while you work
Keep the respirator in good condition
Estimated 3 min
No tier-1 source was found for this value. Take it from the documentation supplied with your equipment.
- Discard the respirator if it looks dirty, feels damaged or is hard to breathe through.<1mReport a problem with step 1, Keep the respirator in good condition
- Store a spare respirator in a clean bag between tasks.1mReport a problem with step 2, Keep the respirator in good condition
- Do not share your respirator with another person.<1mReport a problem with step 3, Keep the respirator in good condition
- Read the manufacturer instructions for a service life limit.1mReport a problem with step 4, Keep the respirator in good condition
Terminology
This page uses one term for each item and holds it throughout, as ASD-STE100 requires. Equipment sellers and other guides use the names below for the same parts.
- filtering facepiece respirator
- Also called: dust mask, N95 mask, disposable respirator, paper mask, particulate respirator, procedure mask
- NIOSH approval number
- Also called: TC number, TC approval number, approval number, certification number
- filter class
- Also called: N95, N99, N100, P100, respirator rating, mask rating
- NIOSH Certified Equipment List
- Also called: CEL, NIOSH respirator list, approved respirator list, NIOSH mask checker
- counterfeit respirator
- Also called: fake N95, fake mask, knockoff N95, imitation respirator, bootleg N95
When to use a professional
This page is for personal use away from a work site. Follow the respiratory protection program of your employer if your work needs one. That program can need a medical evaluation and a fit test.
Stop work and call a certified professional if you are not sure about the material. A disposable respirator does not replace a professional material test.
Talk to a doctor before you use a respirator if you have a lung or a heart condition. Stop work if you feel dizzy or short of breath. Call a doctor right away.
Ask an industrial hygienist about a task with heavy or long dust exposure. A written program under federal rules can apply at a job site. This page does not replace a fit test service.
Common questions
Is a dust mask enough for sanding wood?
For ordinary wood, drywall and general household dust, a genuine N95 filtering facepiece respirator is usually enough. OSHA describes this class of particulate respirator as protection against particles only, not against chemicals, gases or vapors. If the wood is treated, painted or an engineered board, read the product label first, because some of these products release more than dust. A properly fitted N95 with no facial hair crossing the seal is the baseline; a dustier or longer job can call for the N99 or N100 class instead.
What is the difference between a dust mask and an N95 respirator?
In everyday speech, 'dust mask' covers everything from a loose comfort mask sold at a hardware store to a genuine NIOSH-approved N95. Only a respirator on the NIOSH Certified Equipment List with the required label, including a TC approval number, is actually an N95 in the regulatory sense. A soft comfort mask with no approval number may be more comfortable, but it has not been tested to the same standard and should not be assumed to filter 95% of particles.
How can I tell if my N95 is fake?
Start with the label. A genuine NIOSH-approved respirator shows the maker's name, a model or part number, the filter class (such as N95), a TC approval number in the form TC-84A-XXXX, the word NIOSH in capital letters with the correct spelling, and a lot number. NIOSH's own guidance lists missing markings, misspelled NIOSH branding, decorative add-ons such as sequins, ear loops with no connecting fastener, and any claim of approval for children as signs of a counterfeit or misrepresented respirator. The surest check is to search the printed TC number on the NIOSH Certified Equipment List yourself.
What respirator should I use for concrete or masonry dust?
Concrete, brick, stone and tile dust can contain crystalline silica, a hazard that OSHA and NIOSH both take seriously. A higher filter class, such as N100 or P100, gives more filtration than a basic N95. For a one-off small job, a well-fitted higher-class disposable respirator is a reasonable choice, but heavy or repeated silica-generating work, especially at a job site with an employer, can fall under OSHA's silica construction standard and its own respiratory protection requirements. When in doubt, ask an industrial hygienist rather than guess.
Can I reuse a disposable respirator?
Yes, within limits. OSHA's guidance says a filtering facepiece respirator must be replaced when it becomes discolored, damaged or clogged, and NIOSH adds that you can wear one until it is damaged, soiled or noticeably harder to breathe through. Some manufacturers give their own service life or a maximum number of uses on the package or the instructions, so check those first. Store a respirator you plan to reuse in a clean bag, and never share it with someone else.
Do I need a fit test to wear a dust mask at home?
Not for personal, voluntary use away from a job. OSHA has confirmed that voluntary use of a filtering facepiece respirator under 29 CFR 1910.134 does not require a medical evaluation or a fit test, though it is still worth reading the package instructions and doing your own seal check before you start a tool. If your work is for an employer that requires respirator use, that is a different situation, and their written respiratory protection program applies instead, including a medical evaluation and a fit test.
Will an N95 protect me from paint fumes or spray paint?
No. A filtering facepiece respirator, including every class from N95 through P100, filters particles and does nothing for a gas or a vapor. NIOSH is explicit that these respirators do not provide protection against gases or vapors. Spray paint, solvent fumes and similar chemical vapors need a different kind of respirator, most often one with a cartridge rated for organic vapor, which is outside what this page covers.
What is the difference between N95, N99, N100, R95 and P100?
The number is the minimum percentage of particles the filter stops at the hardest-to-catch particle size: 95, 99 or 99.97 (shown as 100). The letter shows how the filter handles an oil-based particle: N means no resistance to oil, R means some resistance for a limited time, and P means strong, lasting resistance. For ordinary power tool dust with no oil mist involved, the letter usually does not matter and N-class respirators are the common choice; a P-class becomes relevant around an oil aerosol, such as some metalworking tasks.
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Sources
Every specification on this page is traced to one of these sources. Tier 1 is a manufacturer document, a published standard, or a government safety authority. See Standards for the full tiering rule.
- Tier 1Filtering Facepiece Respirators
- Tier 1Filtering Facepiece Respirators: Certified Equipment List (CEL) At a Glance
- Tier 1Identifying NIOSH Approved Respirators
- Tier 1Counterfeit/Misrepresented FFR Examples
- Tier 1General Respiratory Protection Guidance for Employers and Workers
- Tier 1Voluntary use respirators (Standard Interpretation, 2018-04-26)
- Tier 1Appendix D to Sec. 1910.134 — Information for Employees Using Respirators When Not Required Under the Standard
- Tier 11910.134 — Respiratory protection
Revision history
Current version 1 · updated 2026-08-03 · next review due 2027-08-03
- v1 · 2026-08-03First draft. Filter class selection (N95, N99, N100, P100) and approval verification against the NIOSH Certified Equipment List, sourced to NIOSH and OSHA (cdc.gov, osha.gov), all tier 1. Filtration percentages and the required-label items are given as narrative facts sourced at the record level rather than as verified specifications, because writing data/specs.json is outside this drafting session's access; the specifications array is therefore three unverified consult-the-source instructions with no digits. The record never implies protection against a gas or a vapor (hazard 1, reinforced in step substeps and two FAQ answers). Asbestos and lead paint are named once, inside a negated warning, and route the reader to a professional material test rather than instructing removal or any excluded work. The professional boundary distinguishes voluntary personal use, which OSHA's 2018 standard interpretation confirms needs no medical evaluation or fit test, from an employer's required-use program, which does.
Corrections to this page are listed in the public corrections log. Reports that are credible and not yet verified are listed in the public errata register, and an open one renders above the step it concerns.
Comments and corrections
Found an error? A correction with a manufacturer source is applied and logged publicly. You can also write to corrections@fixchecklist.com.
Every step above carries its own report control, which tags the report with that step so a correction reaches the right place. For anything about the procedure as a whole — the order of the sections, a step that is missing, something that did not match your equipment — use this: report something about this whole procedure.