3M 5N11 N95 Pre Filter

3M 5N11 Overview

The 3M 5N11 is a NIOSH-approved N95 prefilter that captures at least 95% of non-oil airborne particles and layers that particulate protection on top of a 3M 6000-series gas or vapor cartridge. It is sold and used as a pair, mounting on the standard 3M bayonet platform and held against the cartridge face by the 3M 501 prefilter retainer. Buy the 5N11 when you are already running a vapor cartridge and also need to filter dust or mist — for example spray-area dust or sanding near solvents.

It is not a standalone respirator filter and it is not oil-resistant — the "N" in N95 means it is rated for non-oil particles only. If your aerosol is oil-based, use the oil-proof 3M 5P71 (P95); if you need high-efficiency standalone particulate, use a P100 filter such as the 3M 2091. To match the prefilter and cartridge to your exposure, work through the how to choose a respirator cartridge guide and the 3M filter & cartridge guide, or browse the full range in the 3M respirator filters and cartridges collection.

Where the 3M 5N11 Fits in Respirator Selection

Confirm your hazard before choosing — the 5N11 is an N95 prefilter and only makes sense when you have a particulate exposure in addition to a gas or vapor you are already filtering with a cartridge.

• Vapor plus non-oil dust/mist → a 6000-series cartridge with the 5N11 prefilter and the 501 retainer. See organic vapor vs P100 to confirm the combination.
• Vapor plus oily mist → the oil-proof 3M 5P71 (P95) prefilter instead. The 5N11 is N-rated and cannot be used against oil aerosols.
• Particulate only, high efficiency → a standalone P100 filter, not a prefilter. Compare classes in respirator filter types explained and P100 vs N95.

Who Should Buy the 3M 5N11?

Buy the 5N11 if you already run a 3M 6000-series organic vapor or acid gas cartridge and want to add non-oil dust and mist protection — spray finishing, sanding near solvents, or general nuisance dust — using the 501 retainer to hold the prefilter over the cartridge.

Choose a different part if:

• Your mist or aerosol is oil-based → the oil-proof 3M 5P71 (P95) prefilter.
• You need standalone high-efficiency particulate (silica, lead, asbestos) → a P100 filter such as the 3M 2091, found in the P100 respirator filters collection.
• You want vapor and high-efficiency particulate in one cartridge → a combination such as the 3M 60921 (OV/P100).
• You have no prefilter retainer yet → add the 3M 501 retainer cap, which the 5N11 requires to mount.

What Does the 3M 5N11 Protect Against?

What the 3M 5N11 Does NOT Protect Against

• Oil-based aerosols
• Gas or vapor on its own
• Silica, lead & asbestos
• Organic vapor (alone)
• Acid gas (alone)
• Carbon monoxide
• Oxygen deficiency
• IDLH conditions

Safety: The 3M 5N11 is a non-oil particulate prefilter only. It does not filter gases or vapors by itself, it is not rated against oil aerosols, and no filter adds oxygen. Oxygen-deficient, unknown, and IDLH atmospheres require supplied air, SCBA, or another solution specified by a qualified safety professional. For oily mists, step up to the oil-proof 3M 5P71 (P95).

Best Applications for the 3M 5N11

Spray Finishing & Paint Areas

Use the 5N11 in spray-area dust where you are already running an organic vapor cartridge for the solvent fraction of the paint. The prefilter clips over the cartridge with the 501 retainer and adds N95 dust filtration. Pair it with the 3M 6001 organic vapor cartridge, or confirm the build in organic vapor vs P100.

Sanding Near Solvents

When sanding generates non-oil dust around solvent vapor, the 5N11 handles the dust while the cartridge handles the vapor. For dust that is oily or for higher-efficiency needs, move to the 5P71 (P95) prefilter or a standalone P100 from the P100 respirator filters collection.

General Nuisance Dust on a Vapor Cartridge

For nuisance non-oil dust that would otherwise clog a bare vapor cartridge, the 5N11 acts as a sacrificial particulate layer that you change more often than the cartridge underneath. Browse N95 options in the N95 respirator filters collection.

3M 5N11 Pros & Cons

Compatible 3M Respirators

The 3M 5N11 mounts on the standard 3M bayonet platform over a cartridge, held by the 501 retainer, on these 3M reusable half masks and full facepieces:

Standard 3M bayonet platform, mounted over a cartridge with the 501 retainer. The 5N11 is not a standalone filter and does not fit Honeywell North, Moldex, MSA, GVS, or 3M Secure Click respirators.

3M 5N11 vs Other 3M Filters and Cartridges

3M 5N11 vs 5P71

This is the core prefilter decision, and it comes down to one thing: oil. Both clip over a 6000-series cartridge with the 501 retainer, but the 5N11 is N95 (non-oil only) while the 3M 5P71 is P95 (oil-proof). Buy the 5N11 when your dust and mist are non-oil — water-based spray dust, general sanding dust near solvents. Buy the 5P71 the moment oil aerosols are present, because an N-rated prefilter is not approved for oily mists.

3M 5N11 vs 2091

These solve different problems. The 5N11 is a prefilter that adds N95 dust protection on top of a vapor cartridge; the 3M 2091 is a standalone P100 filter that captures 99.97% of oil and non-oil particles on its own. Buy the 5N11 when vapor is your primary hazard and dust is secondary. Buy the 2091 when particulate is the hazard and you need high-efficiency, standalone protection — and remember the 5N11 is not a substitute for a P100 where one is required.

3M 5N11 Quick Answers

What is the 3M 5N11?

The 3M 5N11 is a NIOSH-approved N95 prefilter for 3M bayonet respirators. It captures at least 95% of non-oil airborne particles and is designed to layer particulate protection over a 3M 6000-series gas or vapor cartridge, held in place by the 3M 501 retainer.

Is the 3M 5N11 oil-resistant?

No. The "N" in N95 means not oil-resistant. The 5N11 is rated for non-oil particles only. If oil aerosols are present, use the oil-proof 3M 5P71 (P95) prefilter instead.

Can the 3M 5N11 be used on its own?

No. The 5N11 is a prefilter, not a standalone respirator filter. It is meant to be used together with a 3M 6000-series cartridge and the 501 retainer, not by itself.

Does the 3M 5N11 need a retainer?

Yes. The 5N11 requires the 3M 501 prefilter retainer to mount it over a cartridge. Without the 501 retainer there is no way to hold the prefilter against the cartridge face.

3M 5N11 Specifications

Helpful Buying Guides

• How to Choose a Respirator Cartridge
• 3M Filter & Cartridge Guide
• Respirator Filter Types Explained
• P100 vs N95: Which Do You Need?
• Organic Vapor vs P100

3M 5N11 Frequently Asked Questions

What is the 3M 5N11 used for?

The 5N11 is used to add N95 non-oil particulate protection on top of a 3M 6000-series gas or vapor cartridge — for example spray-area dust or sanding dust near solvents — using the 501 retainer to hold it over the cartridge.

Is the 3M 5N11 a standalone filter?

No. The 5N11 is a prefilter, not a standalone respirator filter. It must be paired with a 3M 6000-series cartridge and the 501 retainer to be used.

Why is the 3M 5N11 N95 and not P-rated?

The 5N11 is rated N95, meaning it captures at least 95% of non-oil particles and is not oil-resistant. For oily mists you need a P-rated prefilter such as the 5P71 (P95).

What is the difference between the 3M 5N11 and 5P71?

Both are prefilters that clip over a cartridge with the 501 retainer. The 5N11 is N95 (non-oil only); the 5P71 is P95 (oil-proof). Choose the 5P71 whenever oil aerosols are present.

Does the 3M 5N11 need the 501 retainer?

Yes. The 5N11 requires the 3M 501 prefilter retainer to mount it over a cartridge. The retainer holds the prefilter pair against the cartridge face.

Can the 3M 5N11 be used for oil mists?

No. The 5N11 is N-rated and is not approved for oil-based aerosols. For oily mists, use the oil-proof 3M 5P71 (P95) prefilter instead.

Is the 3M 5N11 good for silica or asbestos?

No. Silica, lead, and asbestos work calls for a high-efficiency P100 filter, not an N95 prefilter. Use a standalone P100 such as the 3M 2091 for those hazards.

Is the 3M 5N11 sold as a pair?

Yes. The 5N11 is sold and used as a pair, one prefilter for each cartridge on a dual-cartridge 3M respirator.

What cartridges does the 3M 5N11 work with?

It works with 3M 6000-series gas and vapor cartridges, such as the 3M 6001 organic vapor and 3M 6003 organic vapor / acid gas cartridges, mounted via the 501 retainer.

Does the 3M 5N11 fit the 3M 7500 series?

Yes. The 7500 series uses the standard 3M bayonet platform, so a 5N11 prefilter pair mounts over its cartridges with the 501 retainer.

Does the 3M 5N11 replace a P100 filter?

No. The 5N11 is not a substitute for a P100 filter where one is mandated. It adds N95 non-oil dust protection to a vapor cartridge but does not provide P100-level efficiency.

When should I replace the 3M 5N11?

Replace the prefilter when it is soiled, damaged, or breathing becomes difficult, or according to your employer's respiratory protection program. The prefilter typically changes more often than the cartridge underneath it.

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