May 14, 2026 Updated July 9, 2026 Steven Eaton

Moldex 4701N100 AirWave Review — Small-Size N100 AirWave Disposable

WC Safety Editorial Verdict: 4.3/5

WC Safety Editorial Verdict — 4.3 / 5. The Moldex 4701 N100 AirWave is the Small-size sibling of the standard 4700, delivering identical 99.97% N100 filtration, the AirWave breathing-chamber dome, SmartStrap adjustable headband, and Ventex valve in a reduced facepiece footprint — the right disposable for smaller-faced workers who cannot pass a quantitative fit on the standard size in asbestos, lead, beryllium, or TB-isolation programs. It is editorial-scored on spec and platform parity (we do not publish a customer rating for this SKU yet); the Ventex valve rules it out of source-control settings, and any program weighing it should read our respiratory protection complete guide and confirm fit before committing. Buyers who need reusable N100 source control should instead price a half-mask with cartridges from the moldex respirator cartridges and filters range.

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Moldex 4701 N100 AirWave Review: Small-Size N100 Disposable for Workers Who Need Maximum Filtration and a Smaller Facepiece

When the standard-size Moldex 4700 N100 fails a quantitative fit test on a smaller face, the program has limited options within the N100 disposable category. The 4701 N100 is the next step before transitioning to a completely different platform — a smaller AirWave facepiece geometry providing the same filter efficiency, strap system, and valve in a reduced facepiece footprint. All functional performance characteristics are identical to the 4700 N100; the only variable is the size of the facepiece.

N100 programs serve the most hazardous particulate environments: asbestos abatement, lead remediation, beryllium processing, toxic metal dust operations, and TB isolation precautions above the N95 minimum. In these environments, fit failure is not a minor administrative issue — an inadequate face seal in an N100 program can expose the worker to concentrations of acutely toxic material that the entire respirator program is designed to prevent. The 4701 exists to extend the N100 AirWave platform to the population segment that fits the Small facepiece, ensuring that no worker is excluded from maximum disposable protection due to face size.

AT A GLANCE

NIOSH Rating	N100 — ≥99.97% non-oil particulate
APF	10 (tight-fitting half-mask)
Max Use Concentration	10× PEL
Exhalation Valve	Ventex — NOT source-control eligible
Shell Design	AirWave domed breathing chamber
Headband	SmartStrap adjustable clip
Facepiece Size	Small (standard size = 4700 N100)
Oil Class	N — not oil-resistant

NIOSH Filter Class Comparison Table

Class	Efficiency	Oil Resistance	Typical Use
N95	≥95%	No	General dust, welding fume, healthcare
N99	≥99%	No	TB, fine silica, pharmaceutical APIs
N100	≥99.97%	No	Asbestos, lead, beryllium, TB isolation
R95	≥95%	1 shift	Metalworking coolant mist
P100	≥99.97%	Multi-shift	Asbestos abatement, pesticide, heavy oil mist

Small Size vs. Standard Size: The Fit Test Process for N100 Programs

N100 programs serve high-hazard environments where fit failure is a significant risk event. The fit test process for these programs typically uses quantitative fit testing (QNFT) rather than qualitative (QLFT) because the stakes justify the more precise measurement. OSHA 1910.134(f) requires fit testing with the specific model and size that will be worn; a fit test result from the 4700 N100 does not qualify the wearer for the 4701 N100, and vice versa — they are distinct NIOSH-approved respirators with different facepiece geometries.

The fit test sequence for an N100 program should include both sizes if the program serves a demographically diverse workforce. A common protocol: begin with the 4700 (standard size). If the fit factor is below 100 (OSHA's minimum for tight-fitting respirators), switch to the 4701 (Small). If neither achieves a passing fit factor, evaluate alternative platforms — a different manufacturer's N100 disposable, a reusable elastomeric half-mask with N100/P100 cartridges, or a PAPR with HEPA filter if the face seal concern is unresolvable with tight-fitting designs.

For the full N100 platform decision process, see the Moldex 4700 N100 review and our Moldex N95 buyer's guide. Also review our full-face respirators for higher-APF options when tight-fitting half-masks are insufficient for the concentration range.

AirWave Dome Geometry in Small Facepiece Format

The AirWave dome on the 4701 is a scaled version of the 4700's dome geometry — the same deep cup profile that creates a breathing chamber between the filter and the face, but sized for a smaller face perimeter and shorter face length. The breathing chamber benefits are preserved: lower perceived inhalation resistance, prevention of filter-to-face contact during heavy breathing, and reduced eyewear fogging from the cup geometry directing exhaled air downward rather than upward. N100 filter media's higher resistance makes the breathing chamber benefit more pronounced than with N95 or N99 media — the buffer volume helps smooth inhalation peaks through the denser filter.

Workers with smaller facial dimensions who have previously worn flat-fold or low-profile cup N95 respirators will find the AirWave dome geometry a significant change in forward projection. The dome extends further from the face than most flat-fold and some standard cup designs. This is the functional tradeoff for the breathing chamber — more projection, better breathing dynamics. For face shield clearance concerns in a Small-size N100 program, there is no Low Profile N100 option in the Moldex line; evaluate face shield compatibility by trial fit with the specific shield model.

Ventex Valve in Extended-Wear N100 Applications

N100 filter media's higher breathing resistance makes the Ventex valve even more important for compliance in the 4701 than in N95 programs. Workers in asbestos abatement teams or lead remediation crews often work full shifts in restrictive PPE — coveralls, gloves, eye protection — in environments that may be thermally challenging. The Ventex valve's reduction in exhalation resistance and cup temperature meaningfully improves comfort sustainability across a full shift, which in N100 programs directly affects whether workers keep their respirator in place throughout the hazardous operation.

The valve disqualifies the 4701 from source-control settings — the same tradeoff as the 4700 N100. In N100 environments (asbestos abatement, lead abatement, beryllium machining), source control of the wearer's exhaled air is not typically a regulatory requirement — the protection is for the wearer against the incoming hazard. The valve is therefore appropriate for the primary applications of the 4701 N100.

SmartStrap in Small-Size High-Hazard Programs

The SmartStrap adjustable clip headband on the 4701 N100 provides tension adjustment that is particularly important in the Small-size facepiece. Small facepieces inherently have a smaller perimeter length where the elastomeric seal contacts the face — seal force distribution is concentrated over a smaller area. Proper headband tension is critical: too little tension and the seal leaks; too much tension causes discomfort and encourages removal or distortion of the facepiece geometry. SmartStrap's adjustable clips allow fine-tuning during fit testing to find the optimal tension for each worker's face geometry, then locking that tension for reproducible donning in subsequent uses.

Where the 4701 Fits in the Moldex Small-Size Lineup

Moldex offers several Small-size models across different filter classes and platforms. Understanding the full Small-size portfolio is important for programs building multi-hazard protection options:

Model	Filter	Shell	Strap	Valve	Source Control
4701 N100	N100 ≥99.97%	AirWave dome	SmartStrap	Ventex	No
4700 N100	N100 ≥99.97%	AirWave dome	SmartStrap	Ventex	No (Standard size)
2601 N95	N95 ≥95%	Low Profile cup	HandyStrap	None	Yes
2201 N95	N95 ≥95%	Flat-fold	Dual strap	None	Yes

For programs requiring the highest filtration in a small facepiece with source control capability, the 4701 does not satisfy that requirement — its Ventex valve prevents source control use. A reusable elastomeric half-mask sized for smaller faces, combined with N100 cartridges, is the alternative for source-control N100 programs. See our half-face respirators collection for reusable options.

Regulatory Requirements for N100 Disposable Programs

Programs specifying the 4701 N100 must comply with the full OSHA 29 CFR 1910.134 requirements: written program, hazard assessment documenting the need for N100 class protection, medical evaluation (OSHA Appendix C questionnaire minimum), quantitative fit testing (recommended over qualitative for N100 programs given the high-hazard applications), annual re-testing, training, and recordkeeping. Specific substance standards (asbestos, lead, beryllium, chromium VI) impose additional requirements beyond 1910.134 — reference each applicable substance standard for the complete regulatory framework.

NIOSH TC approval numbers for the 4701 are distinct from the 4700 — both are approved under the TC-84A N100 series but with different model numbers. Verify current approval status at the NIOSH Certified Equipment List. For the full buyer's guide, see the Moldex respirator buyer's guide and the full WC Safety respirators collection.

Find the Moldex 4701 N100 on Amazon Check Price on Amazon → and through the WC Safety disposable respirators collection.

Frequently Asked Questions — Moldex 4701 N100

Q: What is the difference between the Moldex 4701 and the 4700 N100?

A: Facepiece size only. The 4701 is Small size; the 4700 is standard size. Both provide identical N100 ≥99.97% filtration, AirWave domed shell, SmartStrap adjustable headband, and Ventex exhalation valve. Size selection must be determined by fit testing.

Q: Why would someone need the 4701 instead of the 4700?

A: Because they failed a quantitative fit test on the standard-size 4700. Smaller facial dimensions — shorter face length, narrower cheekbone width — produce inadequate seal on standard-size facepieces. The 4701's smaller facepiece geometry provides an adequate seal for workers in that size range.

Q: Does N100 in the 4701 require a different APF than N95?

A: No. All tight-fitting filtering facepiece half-masks carry APF 10 under OSHA 1910.134, regardless of filter efficiency class. The N100 rating provides higher filtration efficiency within APF 10, not a higher protection factor.

Q: Is the 4701 N100 appropriate for asbestos abatement?

A: For concentrations at or below 10× PEL in the half-mask N100 concentration tier, yes. Many asbestos operations require higher APF than APF-10 — verify the specific requirements under OSHA 1926.1101 for the work class before specifying. The 4701 is appropriate where APF 10 with N100 filtration is specifically required and the worker cannot achieve a passing fit on the standard-size 4700.

Q: Does the Ventex valve make the 4701 unsuitable for source control?

A: Yes. The valve allows exhaled air to exit without passing through the N100 filter. The 4701 is appropriate for environments where the wearer needs maximum inhalation protection, not for settings where exhaled aerosol containment is required.

Q: How do I know if I need the Small (4701) vs. standard (4700) N100?

A: Only through quantitative fit testing. Conduct a QNFT with the 4700 first. If the fit factor is below 100, test the 4701. Select the model that achieves a passing fit factor (≥100 for N100 class tight-fitting respirators). Self-assessment is not an acceptable substitute for fit testing under OSHA 1910.134(f).

Q: Is the Moldex 4701 NIOSH approved?

A: Yes. The 4701 N100 holds a distinct NIOSH TC approval number for the Small-size N100 AirWave platform, separate from the 4700's approval. Verify the TC number on the packaging at the NIOSH Certified Equipment List.

Q: Can the 4701 N100 be used for lead abatement?

A: Yes, for the appropriate concentration tier under OSHA 1910.1025 (general industry) or 1926.62 (construction) where APF 10 with N100 filtration is specified. For higher lead concentrations requiring APF above 10, a full-face elastomeric or PAPR is required.

Q: What does the AirWave dome design do for N100 filtration?

A: The AirWave dome creates a breathing chamber between the N100 filter media and the face, reducing perceived inhalation resistance — important because N100 media has inherently higher resistance than N95. The chamber volume buffers inhalation peaks and prevents the uncomfortable filter-to-face contact that can occur with flatter cup designs during deep breathing.

Q: Is the 4701 N100 appropriate for beryllium?

A: For non-oil beryllium-containing dust and fume at concentrations within the APF-10 half-mask tier, yes. N100's ≥99.97% efficiency meets the filtration requirement under OSHA 1910.1024 for beryllium. Verify the specific regulatory tier and concentration range before finalizing the selection.

Q: Can the 4701 N100 be used in TB isolation rooms?

A: Yes. N100 exceeds CDC's N95 minimum recommendation for healthcare workers in TB isolation rooms. The Ventex valve is typically acceptable for this use since the healthcare worker (not the patient) is the wearer. Verify facility infection control policy for any restrictions on valved respirators in isolation rooms.

Q: What medical evaluation is required before using the 4701 N100?

A: OSHA 1910.134 requires a medical evaluation (at minimum, the OSHA Appendix C questionnaire) before initial fit testing and use for required-use respirator programs. The evaluation must be completed by a licensed healthcare professional. N100 programs in high-hazard environments typically require more thorough medical evaluations than the minimum questionnaire.

Q: Where can I buy the Moldex 4701 N100?

A: Available at WC Safety's disposable respirators collection and on Check Price on Amazon →.

Q: Is the 4701 N100 reusable or single-use?

A: Single-use disposable. Discard after each shift or when: breathing resistance has increased substantially, physical damage is present, the facepiece has been contaminated, or the user seal check fails. For N100 applications involving highly toxic material (asbestos, lead, beryllium), single-shift discard is the standard practice — do not rely on extended reuse in high-hazard programs.

Q: How does the 4701 N100 compare to a reusable elastomeric with P100 cartridges?

A: The 4701 N100 is more convenient (no maintenance, no cartridge storage) but higher per-use cost. A reusable elastomeric half-mask with P100 cartridges provides oil-proof filtration (vs. N100's non-oil-resistant N class), higher or equivalent filtration efficiency, and lower per-use cost over time but requires cleaning, inspection, and cartridge change-out management. For high-frequency, all-shift N100 programs, calculate the annual cost crossover to determine whether reusable is more economical. See our half-face respirators and respirator cartridges for reusable options.

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Disclosures & editorial standards
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Safety equipment selection is governed by applicable OSHA standards and your facility's safety program.

Fit & Sizing Resources

Respirator Sizing Guide: How to Find the Right Fit (2026) — face measurement to S/M/L size charts for 3M, Moldex, Honeywell, MSA, and GVS
How to Fit Test a Respirator: QLFT, QNFT, and OSHA Requirements (2026) — step-by-step fit test protocol, what to do when you fail, workplace program requirements
Can You Wear a Respirator With a Beard? OSHA Rules and Solutions (2026) — why beards break the seal, OSHA 1910.134 requirements, PAPR alternatives

Pros & Cons

Pros

True N100 99.97% non-oil filtration — the highest disposable particulate class — in a Small facepiece sized for shorter face length and narrower cheekbone width
Small geometry lets workers who fail QNFT on the standard 4700 stay within the same N100 AirWave platform instead of switching manufacturers
AirWave domed breathing chamber lowers perceived inhalation resistance — a real comfort gain given N100 media's higher resistance versus N95/N99
Ventex exhalation valve reduces cup heat and exhalation effort, supporting full-shift compliance in restrictive abatement PPE
SmartStrap adjustable clips allow per-worker tension tuning, important on a small-perimeter seal where force is concentrated
Holds a distinct NIOSH TC approval as a Small-size N100, so fit-test records map cleanly to the exact model and size worn

Cons

Ventex valve disqualifies it from source-control / exhaled-aerosol-containment settings — not a substitute for an unvalved respirator
Single-use disposable: no cleaning or filter replacement, so cost-per-shift is higher than a reusable elastomeric over a long program
AirWave dome projects further from the face than flat-fold designs, which can crowd tight-fitting face shields or goggles
Small size still must pass its own quantitative fit test — a passing 4700 result does not transfer, and some faces pass neither
Capped at APF 10; high-concentration asbestos, lead, or beryllium tiers requiring higher protection need a full-face elastomeric or PAPR

Who It's For

Buy it if:

Smaller-faced workers in N100 programs (asbestos, lead, beryllium, toxic-metal dust) who failed a quantitative fit test on the standard-size 4700
Safety managers standardizing on one N100 AirWave platform across a demographically diverse crew who need both standard and Small sizes stocked
Crews working full shifts in hot, restrictive abatement PPE who benefit from the Ventex valve and AirWave breathing-chamber comfort
Healthcare or infection-control settings wanting N100 (above the N95 minimum) for TB isolation where a valved respirator is policy-permitted
Programs that want maximum disposable filtration without the cleaning, fit-check, and cartridge-logistics overhead of a reusable elastomeric

Look elsewhere if:

Anyone in a source-control role who must contain their own exhaled aerosol — the Ventex valve makes this model ineligible
Standard- or larger-faced workers who pass on the 4700 and gain nothing from the smaller facepiece
High-concentration operations needing APF above 10, where a full-face elastomeric or PAPR is required regardless of filter class
Long-running daily programs where a reusable N100/P100 elastomeric half-mask delivers lower lifetime cost than a disposable

Related Resources

Frequently Asked Questions

For a small-faced worker, is the 4701 N100 a better pick than a Honeywell North reusable half-mask with P100 cartridges?

It depends on program length and source-control needs. The 4701 is a grab-and-go disposable with no cleaning, no fit-check valve maintenance, and a Small facepiece for smaller faces. A reusable platform like the one behind our Honeywell North 7580P100 review costs more upfront but is cheaper per shift over a long program, offers source-control (unvalved) options, and is available in size Small for the same smaller-face population. Choose the 4701 for short-duration or intermittent N100 tasks; choose a reusable elastomeric for daily, full-shift, or source-control work.

How does the 4701 N100 compare in value to a P100 disposable for the same dusty work?

N100 and P100 both deliver 99.97% efficiency; the practical difference is oil resistance, not particle capture. For non-oil hazards (asbestos, lead, beryllium dust, mineral fume) the 4701 N100 is the cost-efficient choice — you are not paying for P-class oil tolerance you don't need. Reserve P100 disposables for environments with oil mist, pesticide carriers, or cutting-fluid aerosols. See our respiratory protection complete guide for matching class to hazard.

Is paying for N100 worth it over an N99 disposable on the same job?

N99 captures 99% and N100 captures 99.97% — a small efficiency step. The N100 is worth the premium where a substance standard or hazard assessment specifically calls for the highest disposable class, or where leadership wants maximum margin on acutely toxic particulate. For routine fine-dust work that an N99 already covers at APF 10, the upgrade is marginal. Both share the same APF 10, so neither buys you higher assigned protection — only more filter margin.

Does the 4701 N100 fog safety glasses less than a flat-fold respirator?

Generally yes. The AirWave dome geometry directs exhaled air downward through the Ventex valve rather than venting upward toward the eyes, which reduces lens fogging compared with many flat-fold designs that leak warm air over the nose bridge. Fit still matters — a good seal at the nose is what stops fog. For shield clearance and eyewear interaction, trial-fit the dome with your specific glasses or goggles before standardizing.

How should I store the 4701 N100 between shifts if I'm reusing it within a single work period?

As a disposable, it is intended for limited reuse only where the program's change-out schedule and the substance standard permit it. Between uses within a permitted window, store it in a clean, breathable container (paper bag, not a sealed plastic bag that traps moisture) away from contamination, crushing, and heat. Discard immediately if soiled, damaged, hard to breathe through, or after the program's defined service interval. Never share a unit between workers.

Is the 4701 a good fit for women or workers with naturally smaller facial dimensions?

That is precisely its design intent. The Small facepiece targets shorter face length and narrower cheekbone width, demographics that frequently fail seal on standard-size cup respirators. It is a strong candidate for any worker — regardless of gender — whose quantitative fit factor falls short on the 4700. The deciding factor is always the fit test result for that individual, not assumptions about face size.

When should a program escalate past the 4701 to a full-face respirator or PAPR?

Escalate when the airborne concentration exceeds the APF-10 half-mask tier, when neither the 4700 nor the 4701 achieves a passing fit factor, or when the worker cannot tolerate a tight-fitting facepiece. A full-face elastomeric raises the assigned protection factor and adds eye protection; a PAPR with HEPA removes the tight-seal requirement entirely. Browse higher-protection options in the respiratory protection collection.

Does an ESLI or change-out indicator apply to the 4701 N100?

No. ESLI (end-of-service-life indicators) apply to gas and vapor cartridges where a sorbent becomes saturated, not to particulate filtering facepieces. The 4701 is changed on a particulate basis — increased breathing resistance, soiling, damage, or the program's defined interval — not by sorbent breakthrough. If your program also runs gas/vapor cartridges, our respirator cartridge esli guide explains where indicators do apply.

Can I run the 4701 N100 alongside Honeywell North P100 filters in the same multi-hazard program?

You can stock both, but they serve different roles and are not interchangeable on one facepiece. The 4701 is a standalone disposable; Honeywell North P100 media — like the platform in our Honeywell North 75FFP100 review — attaches to North reusable masks via the North bayonet, which is brand-specific and not cross-compatible with any disposable. Use the 4701 for non-oil disposable tasks and the North P100 setup where oil resistance or reusability is required.

Is the 4701 N100 cost-justified for occasional or short-duration N100 tasks?

Yes — that is its sweet spot. For intermittent abatement, spot remediation, or short high-hazard exposures, a disposable avoids the cleaning, storage, and cartridge-inventory burden of a reusable elastomeric, and the per-event cost is low. The economics flip only when a worker is in N100 protection daily for long shifts, where a reusable's lower per-shift cost wins out over time.

Does the smaller facepiece reduce field of view or comfort versus the standard 4700?

Field of view is essentially unchanged — both are half-masks that sit below the eyes. The Small facepiece can actually feel more comfortable for the target population because the seal lands correctly on smaller features instead of being oversized. The tradeoff is the AirWave dome's forward projection, which is the same on both sizes and may feel prominent to workers used to flat-fold respirators.

How does the 4701 N100 fit into selecting protection for fine silica or pharmaceutical dust work?

For respirable crystalline silica and potent pharmaceutical API dust, N100's 99.97% efficiency provides high filter margin within the APF-10 half-mask tier — appropriate where the hazard assessment calls for maximum disposable filtration on a smaller face. Confirm the required APF against the exposure level first; if concentrations demand more than APF 10, move to a full-face or PAPR. Our respiratory protection complete guide walks the selection logic.

If my crew already fit-tests on the standard 4700, is adding the 4701 worth the extra inventory line?

For a demographically diverse crew, yes. Stocking only the standard size guarantees that some smaller-faced workers fail fit and fall out of the program. Adding the 4701 as a second SKU keeps those workers on the same AirWave platform — same filtration, valve, and strap — which simplifies training and replenishment versus introducing a different manufacturer for small faces.

How does the 4701 N100 compare to a reusable cartridge respirator on total program logistics?

The 4701 has minimal logistics: no cleaning station, no cartridge change-out tracking, no individual mask assignment beyond size. A reusable platform from the moldex respirator cartridges and filters range adds cleaning, storage, and cartridge service-life management, but lowers per-shift cost and supports source control. The 4701 wins on simplicity; the reusable wins on lifetime cost and versatility for high-frequency use.

For a new N100 program, should I choose disposables like the 4701 or build around reusable cartridges from the start?

Match the platform to exposure frequency. If workers face N100 hazards occasionally or in short bursts, disposables like the 4701 minimize upfront cost and overhead. If exposure is daily and full-shift, build around reusable elastomerics with N100/P100 cartridges for lower lifetime cost and source-control flexibility. Many mature programs run both. Use our how to choose a respirator cartridge guide to scope the reusable side.

Why trust WC Safety
Industrial PPE specialists. We do not accept manufacturer payment for placement.

Reviewed by
Steven Eaton, WC Safety Editorial Team — guidance reflects current OSHA, NIOSH and ANSI practice.

Our standards
Ratings combine published specs, hands-on familiarity, and verified customer data where available; we do not fabricate lab tests.

Affiliate disclosure
Some links are Amazon affiliate links (tag wcsafety04-20); purchases may earn us a commission at no cost to you.

Filed in: airwave, disposable-respirator, moldex, n100, small, smartstrap

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