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Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
May 14, 2026 Updated July 17, 2026 Steven Eaton

Moldex 2310N99 Review — When N95 Isn't Enough and N100 Is Overkill

WC Safety Editorial Verdict: 4.2/5

WC Safety Editorial Verdict: 4.2 / 5. The Moldex 2310N99 occupies a deliberately narrow niche — it is the respirator you spec when an N95 leaves too little margin for an acutely toxic aerosol (TB, fine respirable silica, pharmaceutical API dust) but a full N100 or elastomeric P100 program is logistically impractical. Its Ventex valve and cup shell make all-shift N99 wear genuinely tolerable, though the valve rules it out of source-control roles and the APF stays at 10, so you are buying filtration margin, not a higher protection factor. If N95 already satisfies your exposure assessment, start with a Moldex 2601N95 or browse n95 respirators instead; if you are unsure which class your hazard demands, read our disposable respirators complete guide first.

Moldex 2310N99 Review: N99 Disposable Respirator — 99% Filtration for High-Risk Particulate Environments Between N95 and N100

N99 is NIOSH's middle particulate filter class for non-oil aerosols — certifying at least 99% filtration efficiency against the most penetrating particle size (approximately 0.3 microns), compared to N95's 95% minimum and N100's 99.97% minimum. In absolute terms, the difference between N95 and N99 means the N99 passes one particle per 100 where the N95 passes five. That 4-particle-per-100 improvement is meaningful in environments where the hazard is acutely toxic at low concentrations — tuberculosis aerosols, fine respirable crystalline silica, pharmaceutical active ingredient dust, or specific biological aerosols — but where the logistics of a full N100 or P100 elastomeric program are impractical.

The Moldex 2310 is a cup-style, dual-strap, valved N99 disposable. The Ventex exhalation valve makes it comfortable for extended wear — important in applications like TB precaution rooms, pharmaceutical compounding, or extended agricultural operations where workers may wear the respirator for hours at a stretch. The valve disqualifies it from source-control requirements; for N99 filtration with source control, an unvalved N99 would be required — a rare but available format.

AT A GLANCE

NIOSH Rating N99 — ≥99% non-oil particulate
APF 10 (tight-fitting half-mask)
Max Use Concentration 10× PEL
Exhalation Valve Ventex — NOT source-control eligible
Headband Standard dual elastic straps
Shell Design Cup — maintains face clearance on inhalation
Oil Class N — not for oil aerosols
Regulation NIOSH 42 CFR Part 84 | OSHA 29 CFR 1910.134

NIOSH Filter Class Comparison Table

Class Efficiency Oil Typical Application
N95 ≥95% No General particulate, construction, healthcare
N99 ≥99% No Fine silica, TB, pharmaceutical dust, biological aerosols
N100 ≥99.97% No Asbestos, lead, beryllium, TB isolation
R95 ≥95% 1 shift Metalworking coolant mist, oil aerosols
P100 ≥99.97% Multi Asbestos, pesticide spraying, heavy oil mist

N99 vs. N95 vs. N100: When the Middle Class Matters

The practical case for N99 over N95 emerges in specific exposure scenarios. Under OSHA 1910.134 and the APF framework, both N95 and N99 tight-fitting half-masks carry APF 10 — the same maximum use concentration of 10× PEL. The higher filtration efficiency of N99 does not unlock a higher APF; it provides a safety margin within the same use concentration range. That safety margin is the point of N99 selection.

Consider tuberculosis exposure in a healthcare or correctional facility setting. CDC and NIOSH guidance recommends N95 or higher for TB precaution. The NIOSH N99 standard means that at a given airborne concentration, the worker receives roughly one-fifth the inhaled dose compared to N95 (1% leakthrough vs. 5% leakthrough). For an aerosol-transmissible pathogen, that reduction in inhaled dose has meaningful implications for infection probability. The Moldex 2310 N99 provides this enhanced protection in a disposable format that does not require the maintenance infrastructure of an elastomeric half-face or PAPR.

For fine respirable crystalline silica, N99 provides a larger buffer below the dose that causes silicosis or lung cancer. OSHA's silica PEL is 50 µg/m³ for respirable crystalline silica (29 CFR 1926.1153 and 1910.1053). At concentrations approaching 10× PEL (500 µg/m³), an N99 with APF 10 provides calculated protection down to 50 µg/m³ — the PEL itself — while an N95 at the same APF provides protection down to 50 µg/m³ as well, but with less filtration margin against filter variability and fit-test leakage contributions.

For pharmaceutical dust, NIOSH classifies many active pharmaceutical ingredients (APIs) with occupational exposure bands (OEBs) that mandate the lowest practicable inhaled dose. N99 over N95 in pharmaceutical compounding or dispensing environments provides an additional margin in environments where API toxicity is high and exposures are below PEL but not zero.

N99 over N100: the N100 in a disposable format (such as the Moldex 4700 N100 AirWave) provides 99.97% efficiency — HEPA-equivalent — but at higher cost per unit and with greater filter resistance. When 99% efficiency is sufficient for the exposure assessment and the slightly lower resistance of N99 improves all-day wear compliance, N99 is the right selection. When the hazard demands 99.97% — asbestos, lead abatement, beryllium, highly infectious aerosols ��� N100 is required.

Ventex Valve and Source Control in N99 Programs

The Moldex 2310 N99 includes a Ventex exhalation valve. As with all valved respirators, exhaled air exits through the valve without passing through the filter — the respirator is not source-control eligible. In applications like TB precaution in healthcare, this may be a disqualifying characteristic: CDC guidance recommends that patients in TB isolation wear source-control masks, but healthcare workers entering isolation rooms are the primary users of N99+ respirators in that setting. Workers (not patients) wearing the 2310 N99 are using it for inhalation protection, and the valve status is typically acceptable for that use unless the facility's infection control protocol specifically requires unvalved respirators for entering isolation rooms.

Verify the facility policy and applicable regulatory framework (CDC, state health department, Joint Commission for healthcare facilities) before specifying the 2310 N99 in source-control-sensitive environments. For the same N99 filtration without the valve, an unvalved N99 model would be required.

Cup Shell and Breathing Comfort During Extended N99 Wear

N99 filter media carries slightly higher breathing resistance than N95 media because achieving 99% efficiency requires either denser fiber packing or additional electrostatic loading in the filter matrix. The cup shell of the Moldex 2310 maintains an air gap between the filter and the face — the same dome-clearance benefit as other Moldex cup respirators — preventing filter collapse during deep inhalation. Combined with the Ventex valve's low-resistance exhalation pathway, the 2310 N99 manages the comfort-vs-protection tradeoff as well as any N99 disposable on the market.

Programs deploying N99 for extended-shift applications (agricultural workers, pharmaceutical technicians, healthcare workers on full-shift TB precaution) benefit from the valve's heat and moisture reduction. For comparison, the Moldex 4700 N100 in the AirWave platform also uses a valve for the same reason — extended-wear high-filtration respirators are almost universally valved to manage comfort.

Where the Moldex 2310 N99 Fits in a Respirator Program

Safety programs typically maintain a short list of approved respirator models to simplify fit testing, training, and procurement. Adding an N99 requires justification: either the exposure assessment shows a specific benefit from N99 over N95, or the program serves a population where some workers fail N95 fit tests and N99 models have a different geometry that achieves a passing fit factor. The Moldex 2310 shares its cup geometry with other Moldex cup models, so a worker who has an established fit on a Moldex cup N95 is likely (though not guaranteed by regulation) to also fit the 2310. New fit testing is required for the specific model per OSHA 1910.134(f).

For programs where N99 is mandated — healthcare systems that have adopted N99 as a minimum standard above OSHA's N95 requirement, pharmaceutical manufacturers with internal standards, or specific government contracts — the 2310 N99 is a compliant, comfortable, and cost-effective disposable option. See the full respirators collection and our Moldex N95 buyer's guide for complete model selection guidance. Also see the Moldex 4700 N100 for maximum disposable filtration and the Moldex 2601 N95 if N95 meets your exposure requirements.

Find the Moldex 2310 N99 on Amazon Check Price on Amazon → and through WC Safety's disposable respirators collection.

Regulatory and Compliance Notes

NIOSH certifies the Moldex 2310 under 42 CFR Part 84 as an N99 filtering facepiece respirator. OSHA 29 CFR 1910.134 governs its use: APF 10 as a tight-fitting half-mask, annual fit testing required, written program mandatory for required-use applications. CDC/NIOSH respirator guidance for healthcare settings specifies N95 or higher for aerosol-generating procedures and TB precaution — the 2310 N99 exceeds the N95 minimum and is compliant with that guidance.

OSHA does not have a separate APF table entry for N99 vs. N95 — both are tight-fitting filtering facepiece half-masks with APF 10. The N99 certification provides a filtration efficiency margin within the same protection factor category, not a higher APF. For higher APF (e.g., APF 50), a full-face elastomeric or PAPR with hood is required regardless of filter class. See our full-face respirators and half-face respirators for higher-APF options.

Frequently Asked Questions — Moldex 2310 N99

Q: What does N99 mean on a NIOSH-approved respirator?

A: N99 means the filter is certified to capture at least 99% of airborne particles at the most penetrating particle size (approximately 0.3 microns), and is not rated for oil-containing aerosols. It is the middle filtration class between N95 (≥95%) and N100 (≥99.97%) in the non-oil category.

Q: Is N99 better than N95?

A: N99 provides higher filtration efficiency — 99% vs. 95% minimum. That means N99 allows at most 1% of particles to penetrate the filter, while N95 allows up to 5%. For most standard industrial applications, N95 is adequate. For higher-risk aerosols (TB, fine silica, pharmaceutical APIs), N99's lower leakthrough provides meaningful additional protection.

Q: Does N99 have a higher APF than N95?

A: No. Under OSHA 29 CFR 1910.134, all tight-fitting filtering facepiece half-masks — N95, N99, and N100 — carry APF 10. The higher filtration class does not unlock a higher assigned protection factor. For APF above 10, a different respirator type (full-face elastomeric, PAPR) is required.

Q: Is the Moldex 2310 N99 appropriate for tuberculosis protection?

A: Yes. CDC and NIOSH guidance recommends N95 or higher for TB precaution. The 2310 N99 exceeds the N95 minimum. Verify your facility's infection control policy regarding valve status — the 2310 has a Ventex valve and is not source-control eligible, which is generally acceptable for healthcare workers entering isolation rooms (they are the ones being protected, not the patients).

Q: Can the Moldex 2310 N99 be used for silica dust?

A: Yes. N99 filtration is fully appropriate for respirable crystalline silica within APF 10 concentrations (up to 500 µg/m³ for the OSHA PEL of 50 µg/m³). The higher filtration margin compared to N95 provides additional protection against filter variability and low-level face seal leakage contributions to the inhaled dose.

Q: Does the Moldex 2310 N99 have an exhalation valve?

A: Yes — Ventex valve. This makes extended-shift wear more comfortable by reducing exhalation resistance and cup heat/humidity, but disqualifies it from settings requiring source control of the wearer's exhaled aerosols.

Q: Is N99 filtration available in a flat-fold disposable?

A: The 2310 is a cup-style model. Availability of flat-fold N99 disposables varies by manufacturer and market. The cup format of the 2310 provides face clearance and lower breathing resistance during inhalation compared to flat-fold designs.

Q: Is the Moldex 2310 N99 oil-resistant?

A: No. N-class filter media is not rated for oil-containing aerosols. For oil-mist environments requiring high filtration, a P100 elastomeric half-mask or full-face respirator with P100 filters is appropriate.

Q: Does the 2310 N99 require fit testing?

A: Yes. All tight-fitting respirators in required-use programs require annual fit testing per OSHA 1910.134(f). The 2310 N99 is a tight-fitting half-mask and must be fit tested with the specific employee who will wear it.

Q: Why is N99 less common than N95 and N100?

A: N95 is the most specified class because it meets the majority of industrial and healthcare particulate protection requirements at the lowest cost and resistance. N100 is specified for the most hazardous applications (asbestos, lead, beryllium). N99 occupies a narrower niche — high-risk aerosols where N95 is insufficient but N100 infrastructure is impractical. Consequently, fewer manufacturers produce N99 models and market availability is more limited.

Q: How does N99 compare to N100 for asbestos or lead?

A: For asbestos abatement, EPA and OSHA typically require P100 or higher APF protection. N99 at APF 10 would not meet the protection requirements for most asbestos abatement tasks. The Moldex 4700 N100 at ≥99.97% provides the maximum disposable filtration for these applications, though a full-face elastomeric or PAPR is often required for the higher APF needed in asbestos operations.

Q: What is the shelf life of the Moldex 2310 N99?

A: Moldex publishes a 5-year shelf life from manufacture date for uncontaminated N99/N95 disposable respirators stored in original packaging away from UV, high humidity, ozone, and chemical vapors.

Q: Is the Moldex 2310 appropriate for pharmaceutical manufacturing?

A: Yes, where the hazard assessment and occupational exposure band (OEB) for the API being handled requires N99 filtration at APF 10 concentrations. Higher-potency APIs with lower OEB limits may require N100, PAPR, or supplied-air systems. Consult industrial hygiene for OEB-based respirator selection.

Q: Where can I buy the Moldex 2310 N99?

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

Q: Can I use the Moldex 2310 N99 for wildfire smoke?

A: Yes. N99 filtration exceeds the N95 minimum for wildfire smoke particulate protection. The Ventex valve makes it more comfortable for extended outdoor use during smoke events. For large-scale wildfire smoke response programs, also see our full respirators collection for N95 alternatives that may be more cost-effective when N99 is not specifically required by the exposure assessment.

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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.
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Disposable respirator guides & comparisons

WC Safety buyer's guides and head-to-head comparisons:

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Pros & Cons

Pros
  • True N99 filtration (>=99% of 0.3-micron non-oil particles) in a low-maintenance disposable, giving roughly one-fifth the filter leakthrough of an N95 at the same cost class as other cup disposables
  • Ventex exhalation valve plus a self-supporting cup shell make extended-shift N99 wear noticeably cooler and lower-effort than flat-fold or unvalved N99 designs
  • Cup geometry is shared across the Moldex 2300-series line, so a worker already fit-tested on a Moldex cup N95 has a strong (though not regulation-guaranteed) chance of fitting the 2310
  • NIOSH-approved under 42 CFR Part 84 with a published 5-year shelf life, so program stock does not expire on the shelf the way some specialty filters do
  • Fills the genuine N95-to-N100 gap without forcing a jump to an elastomeric platform, simplifying procurement for facilities that standardize on disposables
Cons
  • The Ventex valve disqualifies it from any source-control requirement, so it cannot double as a public-facing or patient-isolation mask
  • APF stays at 10 like every tight-fitting filtering facepiece, so the higher filtration class buys margin but not a higher maximum use concentration
  • N-class media is not oil-rated, ruling it out for metalworking mist, machining coolant, and similar oily aerosols where an R95/P100 is required
  • Costs more per unit and breathes with slightly more resistance than an equivalent N95, which is wasted spend if your exposure assessment does not specifically call for N99
  • Cup-only format with no flat-fold option, so it stows less flat in a pocket or kit than a folding N95

Who It's For

Buy it if:

  • Healthcare, correctional, or lab workers on TB precaution where a facility standard sets N99 as the floor above OSHA's N95 minimum
  • Industrial-hygiene programs managing fine respirable crystalline silica or other low-PEL dusts that want filtration margin beyond N95 without an elastomeric rollout
  • Pharmaceutical compounding and dispensing staff whose occupational exposure band calls for N99 at APF-10 concentrations
  • Buyers who already run a Moldex cup-disposable program and want to add a higher-filtration SKU on familiar fit geometry
  • Extended-shift wearers who need N99 protection but cannot tolerate the heat and resistance of an unvalved high-efficiency disposable

Look elsewhere if:

  • Anyone whose exposure assessment is fully satisfied by N95 — the extra cost and breathing resistance are unnecessary spend
  • Workers needing source control of their own exhaled aerosols, since the Ventex valve vents unfiltered exhalation
  • Oil-mist, coolant, or pesticide-spray environments that require an R- or P-rated filter
  • Asbestos, lead, or beryllium abatement and other tasks that demand P100 media or an APF above 10

Related Resources

Frequently Asked Questions

Is the Moldex 2310N99 worth paying more than an N95 disposable?

Only when your exposure assessment specifically benefits from the higher filtration class. The 2310N99 costs more per unit and breathes with slightly more resistance than an N95; you are buying a smaller leakthrough fraction, not a higher APF. If an N95 such as the Moldex 2601N95 already meets your hazard, the upgrade is wasted money. If the aerosol is acutely toxic at low concentration, the N99 margin is the point of the purchase.

How does the Moldex 2310N99 compare to the Honeywell North 7506N99?

Both are tight-fitting half-mask N99 filters at APF 10, but the 7506N99 is a reusable elastomeric cartridge platform while the 2310N99 is a single-use disposable. The Moldex wins on zero maintenance, no cleaning, and lower upfront cost; the Honeywell North 7506N99 wins on long-run cost per shift and reusability for a stable, named user. Choose disposable for surge use and broad rosters, elastomeric for steady daily wearers.

Should I pick the Moldex 2310N99 or step up to the Moldex 4700N100?

Decide on the exposure number, not the brochure. If 99% efficiency satisfies the assessment, the 2310N99 breathes a touch easier and usually costs less. If the hazard demands 99.97% HEPA-equivalent filtration, only an N100 such as the Moldex 4700N100 qualifies. Both share the same APF 10, so the difference is filtration margin and price, not protection factor.

How does the Moldex 2310N99 stack up against the Moldex 2307N95 in the same product line?

They share Moldex cup-series ergonomics, so fit feel is comparable, but the 2307N95 is a 95% N-class filter and the 2310N99 is the 99% step up. Pick the 2307N95 for routine particulate where N95 is adequate and you want the lowest resistance; pick the 2310N99 only when you need the extra filtration margin. Compare specs in our Moldex 2307N95 review before standardizing a program SKU.

Is the cup-style fit of the 2310N99 comfortable for an 8-hour shift?

It is among the more tolerable N99 disposables for long wear. The rigid cup holds an air gap so the media does not collapse onto your lips on deep inhalation, and the Ventex valve dumps exhalation heat and humidity. That said, N99 media always breathes with more effort than N95, so take rest breaks and replace the respirator when it becomes hard to breathe through.

Will workers already fit-tested on a Moldex N95 fit the 2310N99?

Often, but it is never guaranteed by regulation. The 2310N99 shares cup geometry with other Moldex 2300-series disposables, so a worker with an established Moldex cup fit has a good chance of passing on the 2310. OSHA still requires a fresh fit test for the specific model under 1910.134(f). Walk through the protocol in our disposable respirators complete guide before relying on a carryover fit.

Does the valve on the 2310N99 make it unsuitable for any of my use cases?

Yes, anywhere source control matters. The Ventex valve vents your exhaled breath unfiltered, so the 2310N99 cannot serve as a public-facing, patient-isolation, or contamination-control mask. For inhalation protection of the wearer it is fine. If your protocol requires an unvalved respirator for entering isolation rooms, you need a different model.

Is the 2310N99 a good fit for a wildfire-smoke or general dust program where budget matters?

It will protect against smoke and dust well above the N95 baseline, but for a high-volume, cost-sensitive smoke program an N95 is usually the smarter buy unless the assessment names N99. Reserve the 2310N99 for the higher-risk subset and stock an N95 from our n95 respirators collection for the bulk of the roster.

How do I judge whether N99 is actually justified over N95 for my exposure?

Look at the toxicity of the aerosol and how close exposures run to the PEL. N99 earns its place when the contaminant is acutely harmful at low dose (TB aerosols, fine silica, potent API dust) and you want filter margin against variability and minor seal leakage. For routine nuisance or general construction dust, N95 is the documented standard. When unsure, defer to industrial hygiene rather than over-spec by default.

Is the 2310N99 a sensible standardization choice for a mixed-hazard facility?

It can be, if part of your roster genuinely needs N99 and you want to minimize SKUs. Many programs keep a short approved-model list to simplify fit testing and procurement, so adding the 2310N99 alongside a Moldex N95 on the same cup geometry keeps training consistent. Adding it purely for marketing reassurance, with no exposure data behind it, just raises cost without raising protection.

How does the 2310N99 compare value-wise to a reusable elastomeric half-mask?

For a stable, full-time wearer, an elastomeric half-mask with N99 or P100 cartridges typically wins on cost per shift over months. The 2310N99 wins when users rotate, demand is intermittent, decontamination is impractical, or you need to deploy fast without a cleaning and storage program. Match the format to how predictable and long-running the wear actually is.

Is the 2310N99 overkill for tasks an R95 or P95 would normally cover?

If oil aerosols are present, an R- or P-rated filter is not overkill, it is mandatory — the 2310N99 is N-class and will not qualify. Compare against a model like the Moldex 2740r95 when your environment includes machining mist or coolant. For dry, non-oil particulate, the N99 question comes down to whether you need 99% margin or 95% suffices.

What should I check before buying the 2310N99 in bulk for a program?

Confirm three things: that your exposure assessment names N99 (not just N95), that valve venting is acceptable for every area it will be used in, and that you can fit-test wearers on this specific model. Verify the unit is genuinely NIOSH-approved using our guide on how to tell if an N95 is NIOSH approved, which applies to N99 markings as well. Buying ahead of those checks risks stocking the wrong class.

How does the 2310N99 compare to other top N99 disposables on the market?

Its differentiators are the Ventex valve and the load-bearing cup shell, which together make long-shift wear easier than flat-fold or unvalved N99 rivals. Where competing N99 disposables sometimes edge ahead is in stowability or an unvalved variant for source control. For a head-to-head against the best-known alternatives, our best n95 respirators 2026 guide and the disposable respirators complete guide map the field by use case.

If I am replacing my current respirator, when does the 2310N99 make sense as the upgrade?

Upgrade to it when a documented change in your hazard — a new process, a tighter exposure band, or a facility standard above OSHA's N95 floor — pushes you past what N95 covers, but not so far that N100 or supplied air is required. It is a targeted step, not a blanket upgrade. If you are simply refreshing stock for the same hazard an N95 handled, stay on N95 and save the premium for where it is actually needed.

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.
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Filed in: disposable-respirator, exhale-valve, moldex, n99, pharmaceutical
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