Moldex 4700N100 Review

Moldex 4700 N100 AirWave Review: HEPA-Equivalent 99.97% Filtration in a Disposable Cup Respirator for Asbestos, Lead, and TB Environments

Published May 14, 2026 · Last updated July 27, 2026

N100 is the highest particulate filter efficiency class defined by NIOSH under 42 CFR Part 84: ≥99.97% against the most penetrating particle size (approximately 0.3 microns), tested with non-oil aerosols. At 99.97% efficiency, N100 is the functional equivalent of a HEPA filter — the same standard used in hospital room air filtration systems and cleanroom HVAC. The Moldex 4700 delivers this filtration class in a disposable format — no maintenance, no cleaning, no cartridge storage between uses, no gasket inspection. When the shift ends, the respirator is discarded.

The N100 designation applies to the N-class (non-oil-resistant) rating. The 4700 N100 is not rated for oil-containing aerosols — for HEPA-equivalent filtration in oil environments, a P100 elastomeric or supplied-air respirator is required. In non-oil environments where 99.97% efficiency is required — asbestos fiber, lead dust, beryllium dust, non-oil toxic metal dusts, TB aerosols — the 4700 N100 provides maximum disposable particulate protection with APF 10 as a tight-fitting half-mask.

NIOSH Filter Class Comparison Table

When N100 Is Required Over N95 and N99

N100 filtration is appropriate when the hazard assessment identifies particulate hazards so acutely toxic that the small fractional penetration of N95 or N99 creates unacceptable residual risk, or where regulatory standards specifically mandate N100 or P100 class filtration. Key applications include:

Asbestos: EPA and OSHA asbestos standards (29 CFR 1910.1001 for general industry; 1926.1101 for construction) require respirators providing at least APF 10 at the N100/P100 level for certain operations. For operations exceeding 10× PEL, a full-face elastomeric with P100 or PAPR with HEPA is required. The 4700 N100 at APF 10 satisfies the lowest-tier respirator requirement where concentrations do not exceed 10× PEL.

Lead abatement: OSHA's lead standards (1910.1025, 1926.62) require specific respirator types based on airborne lead concentration relative to PEL (50 µg/m³). For concentrations up to 500 µg/m³ (10× PEL), a half-mask respirator with N100 or P100 filters is required. The Moldex 4700 N100 satisfies this requirement for the 10× PEL tier.

Beryllium: OSHA's beryllium standard (1910.1024, 1926.1124) requires P100 filtering efficiency for beryllium-containing dust and fume. N100 and P100 share the 99.97% efficiency threshold — N100 is appropriate for beryllium operations in non-oil environments.

TB isolation rooms: CDC guidance recommends N95 or higher for healthcare workers entering airborne infection isolation rooms. For facilities choosing to exceed the N95 minimum for higher-risk patient scenarios (multi-drug resistant TB, post-aerosol-generating procedures), N100 provides maximum disposable filtration without a reusable elastomeric platform.

Toxic metal dust (cadmium, chromate, arsenic): OSHA specific substance standards for cadmium (1910.1027), chromium VI (1910.1026), and arsenic (1910.1018) specify respirator requirements based on exposure concentration. The 4700 N100 at APF 10 covers the relevant concentration tiers for these substances in the half-mask range.

Ventex Valve in N100 Disposable Programs

N100 filter media carries higher breathing resistance than N95 or N99 — achieving 99.97% efficiency requires denser fiber packing and more extensive electrostatic treatment in the filter matrix. The Ventex exhalation valve on the Moldex 4700 is not optional for extended-shift compliance — it is a practical necessity. Without the valve, exhalation through N100 media would create significant resistance that would make all-day wear uncomfortable and drive respirator removal in the hazard zone.

The Ventex valve makes the 4700 N100 suitable for tasks requiring extended wear: asbestos abatement walkthrough inspections, lead abatement surface preparation, pharmaceutical API handling, or any application where N100 protection is needed for periods longer than brief task entries. The valve tradeoff is source control disqualification — the 4700 is not appropriate for settings where the wearer's exhaled aerosols must be filtered. For N100-equivalent filtration with source control, a full-face elastomeric or PAPR is required (no major manufacturer offers an unvalved N100 disposable for extended wear due to the practical resistance limitations).

For source-control eligible N95 in the AirWave platform, see the Moldex 4600 N95 (unvalved, FDA surgical-cleared).

AirWave Platform and SmartStrap in High-Hazard Environments

The AirWave domed shell creates a breathing chamber that is particularly valuable with N100 filter media. The large dome volume provides a reservoir of air immediately inside the facepiece, buffering inhalation peaks and making the higher resistance of N100 media less perceptible during normal breathing. Moldex's SpiroTek filter technology — a graduated-density electrostatic fiber matrix — is optimized for both efficiency and resistance, achieving N100 certification with lower resistance than some competing N100 disposables.

The SmartStrap adjustable headband allows workers to achieve consistent tension across varied head sizes — important in programs where multiple workers use the same respirator model and individual tension control affects seal quality and comfort. Properly tensioned headbands reduce seal leakage without the over-tightening that causes discomfort and encourages removal.

The Small-Size Variant: 4701 N100

Workers who fail quantitative fit testing on the standard-size 4700 N100 have the Moldex 4701 N100 as the next step — the Small-size variant of the same AirWave platform with identical N100 filtration, SmartStrap, and Ventex valve. Size selection must be determined by fit testing, not self-assessment. For programs serving mixed-gender workforces or populations where smaller facial dimensions are common, stocking both the 4700 and the 4701 ensures fit test options across the full population. See the Moldex 4701 N100 review for the Small-size variant comparison.

Regulatory Compliance for N100 Programs

Under OSHA 29 CFR 1910.134, N100 class respirators carry APF 10 as tight-fitting half-masks — the same APF as N95. For concentrations above 10× PEL of any of the hazardous substances mentioned above, a higher APF respirator is required (full-face elastomeric at APF 50, or PAPR/supplied-air at APF 25–1000 depending on configuration). Asbestos operations in particular often require higher APF than a half-mask N100 can provide for class III or class II work — verify specific regulatory requirements for the operation classification before specifying any half-mask respirator for asbestos.

NIOSH certifies the 4700 N100 under TC-84A series. The NIOSH TC number printed on the respirator and packaging verifies authenticity and approval status. For the full regulatory framework, see our NIOSH respirator standards guide and the full respirators collection. For reusable N100/P100 options with higher APF, see our full-face respirators.

Find the Moldex 4700 N100 on Amazon Check Price on Amazon → and through the WC Safety disposable respirators collection.

Frequently Asked Questions — Moldex 4700 N100

Pros & Cons

Who It's For

Buy it if:

• Asbestos, lead, and silica abatement crews needing 99.97% filtration without the cleaning and storage overhead of elastomerics
• Maintenance and demolition workers facing non-oil toxic metal dusts (beryllium, cadmium, manganese) on intermittent jobs
• Healthcare and lab staff in TB or HEPA-equivalent isolation tasks who want a disposable, fit-tested option
• Employers wanting a no-maintenance N100 for occasional high-hazard tasks rather than a daily-use program
• Workers who find dense N100 cups suffocating and need the AirWave/valve breathability advantage

Look elsewhere if:

• Anyone exposed to oil mist or oil-based aerosols — this is N-rated and must be a P100 instead
• High-volume daily N100 users for whom a reusable P100 elastomeric is far cheaper per shift
• Jobs requiring source control or a clean/sterile field, where a valved respirator is prohibited
• Operations needing protection above APF 10, which requires a full-face or supplied-air respirator

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Common questions

Sources. Requirements referenced here come from OSHA 29 CFR 1910 and the NIOSH recommendations. Where a consensus standard governs, the ANSI document is named in the text.

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WC Safety is an independent, affiliate-supported review site. It is not a retailer: it holds no inventory, takes no orders, and earns only from qualifying purchases through clearly marked links — which never changes what a product is rated to do. Standards language is taken from the regulation text directly, and ratings are reported as the manufacturer publishes them. We run no laboratory and perform no testing of our own. Where published sources disagree, we say so and plan on the conservative figure rather than the flattering one.

Our methodology

Figures come from the regulation and the published specification, in that order. Derated numbers are calculated, not estimated. Nothing here is presented as a measured result, because we measure nothing.

Researched and written by Steven Eaton, editor of WC Safety. Steven holds no safety certification and does not test products; this page compares what manufacturers and regulators publish, with the gaps in that record marked. Last reviewed August 2026.

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