3M 8511 vs Moldex 2300N95: Cross-Brand Valved N95 Comparison (2026)
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Quick answer
Both are valved NIOSH N95 cups for hot, dusty work — same rating, equivalent filtration. The 3M 8511 uses 3M’s Cool Flow valve; the Moldex 2300N95 uses Moldex’s Ventex valve and a Dura-Mesh shell, and is made in the USA. Protection is equivalent; choose on fit, comfort, and supply preference.
3M 8511 vs Moldex 2300N95: at-a-glance
| Spec | 3M 8511 | Moldex 2300N95 |
|---|---|---|
| NIOSH rating | N95 (≥95% non-oil) | N95 (≥95% non-oil) |
| Exhalation valve | Yes — 3M Cool Flow | Yes — Moldex Ventex |
| Form factor | Molded cup | Molded cup |
| Outer shell | Standard | Dura-Mesh (resists collapse) |
| Country of origin | Varies | Made in USA |
| Typical pack | 10 / box | 10 / box |
| Sterile/source control use | No (valved) | No (valved) |
| Best for | Hot, dusty work | Hot, dusty work + USA-made |
The two respirators
3M 8511
The 3M 8511 is the valved N95 cup most crews reach for in heat — the Cool Flow valve vents warm, moist air and the comfort straps suit long shifts.
Moldex 2300N95
The Moldex 2300N95 pairs a Ventex exhalation valve with the collapse-resistant Dura-Mesh shell, made in the USA. It’s the natural cross-brand alternative for hot, dusty jobs where you want a domestic supply or a different fit.
Key differences
Different valves, same goal
Both vent exhaled heat and moisture — 3M’s Cool Flow and Moldex’s Ventex achieve the same comfort benefit. Neither changes inhalation protection.
Shell and origin
The Moldex adds a Dura-Mesh shell that resists collapse in heat and is made in the USA; the 8511 is the most widely available valved N95.
Where neither belongs
Because both are valved, neither is used in sterile fields or for source control — the valve releases unfiltered breath. For those settings use an unvalved or surgical N95.
Which should you buy?
| Your situation | Pick | Why |
|---|---|---|
| Hot, humid, or outdoor dust work | Either | Both vent heat via an exhalation valve |
| Domestic supply chain required | Moldex 2300N95 | Made in USA |
| Standardized on 3M | 3M 8511 | Most widely available valved N95 |
| Cup collapses in heat | Moldex 2300N95 | Dura-Mesh resists collapse |
| Maximize fit-test pass rate | Fit-test both | Different cup geometry |
| Source control / sterile area | Neither — use unvalved | Valves release unfiltered air |
Fit & compatibility
Both are one-size valved N95 cups requiring a clean-shaven seal, an OSHA fit test, medical evaluation, and a user seal check. For the unvalved cross-brand pairing, see 8210 vs Moldex 2200N95; to weigh a valve at all, see valved vs unvalved. Browse all valved respirators.
Related guides
- Disposable respirators & N95 masks: the complete guide
- Valved vs unvalved N95
- 3M 8210 vs Moldex 2200N95 (unvalved)
- 3M 8210 vs 8511
- N95 vs KN95 vs P100
- P100 vs N95: the difference
- How to fit test a respirator
- Valved respirators
- N95 respirators
- All disposable respirators
Key takeaways
- Either: Hot, humid, or outdoor dust work — Both vent heat via an exhalation valve.
- Moldex 2300N95: Domestic supply chain required — Made in USA.
- 3M 8511: Standardized on 3M — Most widely available valved N95.
Bottom line
Both the 3M 8511 and Moldex 2300N95 meet their NIOSH rating, so the choice is about matching the respirator to the task, the wearer’s fit, and your budget — not whether you are protected. Work through the at-a-glance table and the scenarios above, then fit-test your pick before relying on it in a hazardous atmosphere. For the full selection framework across every rating and form factor, see our complete disposable respirator & N95 mask guide, or browse all disposable respirators to check current pricing and availability.
Frequently asked questions: 3M 8511 vs Moldex 2300N95
What is the difference between the 3M 8511 and Moldex 2300N95?
Both are valved N95 cups with equivalent protection. The 8511 uses 3M’s Cool Flow valve; the 2300N95 uses Moldex’s Ventex valve plus a Dura-Mesh shell and is USA-made.
Is the Moldex 2300N95 as good as the 3M 8511?
Yes for protection — both are NIOSH N95 with valves for comfort. Choose on fit, supply preference, and price.
Are both valved respirators?
Yes. The 8511 has a Cool Flow valve and the 2300N95 has a Ventex valve, both to vent exhaled heat and moisture.
Can I use either in a sterile or source-control setting?
No. Valved respirators release unfiltered exhaled air, so neither is used in sterile fields or for source control. Use an unvalved or surgical N95 there.
Are both the 8511 and 2300N95 NIOSH N95?
Yes. Both filter at least 95% of non-oil airborne particles and carry full NIOSH N95 approval.
Is the Moldex 2300N95 made in the USA?
Yes, it is USA-made, which can matter for procurement policy.
Do the 8511 and 2300N95 require fit testing?
Yes. Both are tight-fitting respirators requiring fit testing, medical evaluation, and a user seal check for regulated work.
Are the 8511 and 2300N95 reusable?
No. Both are single-use; discard when damaged, soiled, wet, or harder to breathe through.
Which is better for hot weather?
Both vent heat well via their valves. The Moldex Dura-Mesh shell also resists collapse in heat; the 8511 is the easiest to source.
Do either protect against oil mists?
No. Both are N-series (non-oil). Use an R95 or P-series respirator where oil aerosols are present.
About this guide. Written by Steven Eaton, founder of WC Safety, drawing on published NIOSH approvals and manufacturer datasheets for each respirator. WC Safety is an independent industrial-PPE retailer; we do not accept payment for rankings. Reviewed by the WC Safety Editorial team. Always follow your employer’s written respiratory-protection program and OSHA 29 CFR 1910.134.