Moldex 4701N100 AirWave N100 Small Respirator Review — Small-Face Fit Buyer's Guide

Is the Moldex 4701N100 the answer for smaller faces that fail an N100 fit test?

Published June 20, 2026 · Last updated July 27, 2026

Short answer: That is exactly its job. The Moldex 4701N100 is the small-size version of the 4700N100 — the same NIOSH N100 (99.97% non-oil) AirWave mask sized for smaller faces. Fit, not filtration, is the reason to choose it: a respirator only protects if it seals, and many smaller-faced workers fail the regular size.

Moldex 4701N100 AirWave N100 Respirator Small with SmartStrap and Valve Review (2026)

The Moldex 4701N100 is the small-size N100 AirWave. This review covers fit-driven selection within the N99 & N100 respirators range. Sizing background is in our respirator sizing guide and complete disposable respirator & N95 mask guide.

Editorial verdict — 4.3/5
The Moldex 4701N100 exists for one reason that matters more than any feature: fit. It is the small version of the 4700N100 — identical N100 99.97% non-oil filtration, AirWave low resistance, SmartStrap, and Ventex valve — sized for smaller faces. Because protection depends entirely on the seal, the right size is the difference between real and theoretical protection.VIEW ON WC SAFETY →CHECK PRICE ON AMAZON →

As an Amazon Associate, WC Safety earns from qualifying purchases. Prices and availability are accurate as of the date shown and are subject to change. Full affiliate disclosure.

Who it is for

• Smaller-faced workers who fail the regular-size N100 fit test
• Programs maximizing fit-test pass rates across diverse faces
• Anyone needing N100 protection in a smaller mask

The 4701N100 occupies a narrow but important niche in the N99 & N100 respirators category. Most disposable respirator lines are built around a single "regular" facepiece designed for the statistical average face. That works for the bulk of a workforce, but the average is not the whole workforce. Workers with narrow jaws, low nasal bridges, or generally smaller facial dimensions routinely leak around a regular-size N100 no matter how carefully they don it — and a leak at the seal undoes the entire 99.97% filtration advantage that makes an N100 worth buying in the first place. The small-size 4701N100 closes that gap by giving those workers a facepiece scaled to their geometry. The point is not that the small mask filters better; it is that, for the right face, it is the only version of this mask that will actually pass a fit test and therefore deliver the protection on the label.

What the Moldex 4701N100 AirWave (Small) does well

Small-face fit

The reason to buy it: a smaller-sized N100 that seals where the regular size leaks. Protection follows fit. See our respirator sizing guide.

Full N100 protection

No filtration compromise — same 99.97% non-oil AirWave media as the 4700N100.

AirWave comfort

Low breathing resistance and a heat-venting valve, important for long N100 wear.

SmartStrap and Ventex valve

Two features carry over from the full AirWave platform and matter more on a high-efficiency mask than on a basic N95. The SmartStrap is a one-size head harness that adjusts to the wearer rather than forcing the wearer to adjust to a fixed strap, which helps the small facepiece sit consistently across the bridge of the nose and under the chin — the two zones where most leakage originates. The Ventex exhalation valve vents warm, moist exhaled air out of the breathing zone. On an N100, where the dense filter media naturally creates more breathing resistance than a thinner N95, that venting is not a luxury; it is what keeps a worker willing to wear the mask for a full shift instead of pulling it down to cool off. A respirator that gets removed mid-task protects no one, so comfort that sustains compliance is a genuine protective feature, not just an ergonomic nicety.

Consistent media across the size range

Because the small and regular 4701N100/4700N100 share identical AirWave N100 filter media, a safety program can stock both sizes without re-validating the protection level for each. The only variable between them is the facepiece dimensions, which simplifies hazard assessment, training, and recordkeeping. Whatever your industrial hygienist concluded about the regular 4700N100 against your dust or fume hazard applies unchanged to the small version, so adding the small size to a program is a fit decision rather than a protection decision.

Where the Moldex 4701N100 AirWave (Small) falls short

Won't fit larger faces

Sized small by design; larger faces should use the regular 4700N100.

Non-oil only

N100 is not oil-rated; for oil mist use a P100.

Valved, single-use

No source control; a consumable.

Higher cost per mask than an N95

N100 media is denser and more expensive to produce than N95 media, so the 4701N100 carries a higher per-mask cost than a basic filtering facepiece. That premium is justified only when the hazard genuinely calls for 99.97% efficiency — heavy lead, high silica loading, or fine toxic fume where the smaller leakage allowance of an N100 measurably lowers exposure. For routine nuisance dust, paying N100 prices buys protection the task does not require, and a fit-tested N95 is the more rational spend.

Moldex 4701N100 AirWave (Small) vs the competition

Compare prices on Amazon →Moldex 4701N100Moldex 4700N100Moldex 4400P100

Reading the table by intent rather than by spec makes the choice straightforward. The 4701N100 (Small) and the regular 4700N100 are the same mask in two sizes; you pick between them entirely on which one your face seals against, ideally confirmed by a fit test rather than by eye. The 4400P100 is the move the moment oil mist enters the picture, because an N-series filter is not certified against oil-based aerosols regardless of its efficiency rating. The 3M 1860S is the cross-shop for a small-face wearer who needs FDA-cleared surgical clearance and only N95-level filtration, not the higher N100 tier. None of these is "better" in the abstract; each wins a specific job, and the 4701N100 wins the small-face, non-oil, maximum-efficiency job.

When to step up from the Moldex 4701N100 AirWave (Small)

Larger face? The regular 4700N100. Oil mist present? The 4400P100 (P100). Need only general dust? An N95. How to get a sealing fit is in our fit-test guide.

Compatibility and program fit

The 4701N100 is a maintenance-free filtering facepiece, so there are no cartridges, retainers, or replacement parts to match — the entire mask is the filter, and it is discarded as a unit. That single-piece design removes a whole class of compatibility errors that plague reusable half-mask programs, where the wrong filter or a missing retainer quietly defeats the respirator. The one compatibility variable that still matters is the human one: the small facepiece must match the wearer's face. Programs that run a mixed workforce should treat sizing as a deliberate step, measuring or fit-testing workers into the regular 4700N100 or the small 4701N100 rather than handing everyone the regular size and hoping. Our respirator sizing guide walks through face measurement, and our fit-test guide covers the qualitative and quantitative methods OSHA recognizes. For wearers who cannot achieve a seal in either tight-fitting size — for example because of facial hair or facial structure — a loose-fitting PAPR is the path, not a tighter strap.

Category context

The 4701N100 is the small-size N100 AirWave in the disposable respirators range. Why size and fit decide protection is covered in our disposable respirator guide and respirator sizing guide.

Total cost of ownership

A fit-driven max-protection consumable. Replace when soiled, damaged, or hard to breathe through (see can you reuse an N95?). Stocking both sizes raises program-wide fit-test pass rates.

The honest way to read the cost of an N100 program is per protected shift, not per box on the invoice. Because the 4701N100 is single-use, every unit it issues is a recurring cost, and N100 media sits at the top of the disposable price range. For a worker who is in a high-efficiency mask only occasionally — abatement work, periodic lead tasks, intermittent heavy fume — disposables keep capital outlay near zero and avoid the cleaning, storage, and filter-tracking overhead of a reusable. For a worker who needs N100-level protection every day, the math eventually favors a reusable half mask respirators with P100 cartridges, where the facepiece is amortized over months and only the cartridges are consumed. The other quiet cost saver is stocking both sizes: a program that hands smaller-faced workers a mask they actually pass on raises its overall fit-test pass rate, which means fewer repeat fit tests, fewer reissued masks, and less time lost to refitting — savings that never appear on the glove-and-mask line but are real.

Final verdict

The Moldex 4701N100 earns 4.3/5 — the small-face route to true N100 protection. Buy it for smaller faces that fail the regular 4700N100; choose P100 (4400P100) if oil mist is present.

VIEW ON WC SAFETY →CHECK PRICE ON AMAZON →

Moldex 4701N100 AirWave (Small) FAQ

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

Size. The 4701N100 is the small version of the 4700N100 — identical N100 99.97% non-oil filtration and AirWave design, sized for smaller faces.

Why does respirator size matter on the Moldex 4701N100?

A tight-fitting respirator only protects if it seals; a too-large mask leaks regardless of its rating. The small size lets smaller-faced workers achieve and pass a fit test. See our sizing guide.

Does the small Moldex 4701N100 filter less than the regular size?

No — filtration is identical N100 (99.97% non-oil). Only the facepiece size differs.

Does the Moldex 4701N100 protect against oil?

No — N100 is non-oil; it filters 99.97% of non-oil particulate. For oil mist use an R95 or P100.

Is the Moldex 4701N100 good for silica or lead?

Yes for non-oil exposure — N100's 99.97% efficiency suits high silica, lead, and heavy fume where no oil is present; if oil is present choose P100. See silica dust respirators.

Can you reuse the Moldex 4701N100?

Single-use with limited reuse when constrained; discard when soiled, damaged, or hard to breathe through. See can you reuse an N95?.

Does the Moldex 4701N100 require fit testing?

Yes for OSHA-regulated use — medical evaluation, annual fit test, and seal check per OSHA 29 CFR 1910.134.

Can I wear the Moldex 4701N100 with a beard?

No — facial hair across the seal fails the fit test; clean-shaven along the seal is required, or use a PAPR.

Is the Moldex 4701N100 latex-free?

Yes — Moldex respirators are made 100% PVC-free and latex-free, reducing irritation and contamination risk.

How long does the Moldex 4701N100 last?

No fixed hours — replace at end of task or when dirty, damaged, or breathing resistance rises.

Is the Moldex 4701N100 a surgical respirator?

No — it is an industrial respirator without FDA clearance. See surgical N95 respirators.

Where is the Moldex 4701N100 made?

Moldex is a US-based respirator manufacturer, and its masks are produced PVC-free and latex-free. Browse the full Moldex disposable respirators line.

How do I know if I need the small Moldex 4701N100?

If you fail or barely pass the regular size, or have a smaller face, try the small and fit-test it. Many programs stock both sizes.

Is the Moldex 4701N100 good for lead or silica?

Yes for non-oil exposure — same 99.97% N100 protection as the regular size, in a smaller fit. If oil is present, use a P100.

Can the Moldex 4701N100 be used for source control?

No — the valve releases unfiltered breath; use an unvalved respirator to protect others.

What does the Ventex valve on the Moldex 4701N100 do?

The Ventex one-way exhalation valve releases warm, humid exhaled air on the out-breath while keeping inhaled air filtered. It lowers heat buildup and fogging on a dense N100 facepiece, which makes long wear far more tolerable. It does not change the N100 protection level, and because it vents unfiltered breath it rules the mask out for source control.

What is the SmartStrap on the Moldex 4701N100?

The SmartStrap is Moldex's adjustable one-size head harness. It lets the small facepiece settle consistently across the nose bridge and under the chin without forcing the wearer onto a fixed strap length, which supports a repeatable seal on smaller faces. A consistent strap position is part of why the same wearer can re-don the mask and still pass a user seal check.

Is the Moldex 4701N100 better than an N95 for fine dust?

For genuinely fine, toxic, non-oil particulate — heavy lead or high silica loading — the N100's 99.97% efficiency leaves less penetration allowance than an N95's 95%, so it is the stronger choice when the exposure justifies it. For ordinary nuisance dust, a fit-tested N95 is adequate and far cheaper; paying N100 prices there buys efficiency the task does not need.