3M 60924 Review: Ammonia + P100 Cartridge for Refrigeration

Quick Verdict

The 3M 60924 is a combination ammonia/methylamine + P100 cartridge — green and magenta banded — for environments where ammonia gas and airborne particulate occur together. It is essentially the gas-only 6004 with a P100 filter added, which makes it an upgrade cartridge rather than a new hazard class.

Who should not choose it: if there is no particulate, the lighter, cheaper gas-only 6004 is the better value; if your hazard is solvent vapor, acid gas, or formaldehyde, this ammonia-specific cartridge does nothing for those; and it is never an emergency device for an ammonia release.

The closest alternative is the gas-only 6004; the broader option is the multi-gas 60926, which also has a P100 but covers several gas classes. New to combination cartridges? Start with how to choose a respirator cartridge and the ammonia cartridge guide.

What the 3M 60924 Is Designed For

The 60924's protection category is ammonia and methylamine (AM/MA) plus P100 particulate. It pairs the alkaline-gas sorbent used for ammonia with an integrated P100 filter — the highest particulate class, oil-proof, capturing at least 99.97% of airborne particles. The two NIOSH bands (green for ammonia/methylamine, magenta for P100) signal both protections in one cartridge.

Intended applications are ammonia workplaces that also generate particulate: industrial refrigeration and cold storage running anhydrous ammonia, water and wastewater treatment, and agriculture, fertilizer, and poultry operations where ammonia mixes with dust. In the 3M lineup, the 60924 is the particulate-equipped branch of the ammonia family — a step up from the gas-only 6004, and narrower than the multi-gas 60926. For the full family see the 3M respirator cartridge guide and the cartridge color chart.

Key Specifications

Real-World Use Cases

The 60924 fits ammonia tasks that also involve dust or mist:

• Industrial refrigeration & cold storage: anhydrous ammonia (R-717) systems for routine maintenance and monitoring, where oil mist or particulate may also be present.
• Water & wastewater treatment: ammonia handling and dosing areas with aerosol alongside the gas.
• Agriculture, fertilizer & poultry: ammonia in barns and storage where airborne dust is a constant — the P100 captures the particulate.
• Chemical manufacturing & handling: ammonia or methylamine processes that also generate dust or mist.

Note what is absent: painting, solvents, and acid gas. Those are different hazard classes; if they are present alongside ammonia, you need a multi-gas cartridge such as the 60926, not the ammonia-specific 60924.

What This Cartridge Does Well

• Fills a rare gap with particulate added: ammonia coverage is uncommon, and the 60924 adds P100 so you do not have to stack a prefilter on a 6004.
• One-piece convenience: ammonia gas and P100 particulate in a single cartridge — fewer parts to manage in dusty barns or plant rooms.
• Highest particulate class: P100 is oil-proof and ≥99.97% efficient, handling oil mist and fine dust that lower-rated filters are not rated for.
• Broad compatibility: fits every current 3M bayonet half mask and full facepiece, so one SKU covers a mixed fleet.
• Clear position in the lineup: easy to reason about — a 6004 with P100 added, narrower than the multi-gas 60926.

Where the 3M 60924 Is Not the Right Choice

This section matters most for a specialty combination cartridge. The 60924 is the wrong choice when:

• There is no particulate. For gas-only ammonia work, the lighter, cheaper 6004 is the better value — read the 3M 6004 review.
• Particulate is the only hazard. For pure dust or fume, a plain 2091 P100 filter is lighter and lower cost than a combination cartridge.
• Multiple gas classes are present. Ammonia plus organic vapor, acid gas, or formaldehyde calls for the multi-gas 60926 — see the 3M 60926 review and organic vapor vs multi-gas cartridge.
• The hazard is solvent vapor or acid gas, not ammonia. Those need an organic vapor or acid gas cartridge, not the ammonia-specific 60924.
• The atmosphere is IDLH, oxygen-deficient, or unknown. An ammonia release is an emergency that requires supplied air or SCBA — no cartridge applies.

3M 60924 vs Similar 3M Cartridges

Because ammonia coverage is uncommon, the 60924's neighbors are its own gas-only and multi-gas siblings:

For the detailed pairings, read the 3M 6004 review and the 3M 60926 review, and the gas-vs-particulate breakdown in organic vapor vs P100.

Compatible Respirators

The 60924 uses the standard 3M bayonet connection and seats on the full current range of 3M bayonet facepieces:

• 3M 6000 Series half masks (6100/6200/6300) — the economical everyday option.
• 3M 6500QL Series (Rugged Comfort, quick-latch) — for plant and treatment-facility work.
• 3M 7500 Series (silicone, all-day comfort) — the most comfortable pairing for long shifts.
• 3M 6000 Series full facepieces (6700/6800/6900) — APF 50 and eye protection from ammonia irritation.
• 3M 7800S Series full facepieces (premium silicone full face).

It does not fit the 3M Secure Click line (a different mount) or any non-3M facepiece — cartridge mounts are brand-specific. See are respirator cartridges universal?

Who Should Buy This Cartridge?

• Refrigeration and cold-storage technicians around anhydrous ammonia systems where oil mist or dust is also present.
• Water and wastewater operators handling ammonia where aerosol accompanies the gas.
• Agricultural, fertilizer, and poultry workers exposed to ammonia plus the dust common in barns and storage.
• Not the right choice for gas-only ammonia work (use the 6004), particulate-only tasks (use the 2091), multiple gas classes (use the 60926), or solvent vapor and acid gas.

Final Recommendation

The 3M 60924 is the right cartridge whenever ammonia and particulate appear together — most commonly refrigeration with oil mist, and agricultural ammonia with dust. It removes the need to stack a prefilter on a 6004 and gives you the highest particulate class in one unit. Buy it for ammonia-plus-particulate environments, and pair it with whichever 3M facepiece fits your crew; a full facepiece is worth considering since ammonia irritates the eyes.

The closest gas-only alternative is the 6004 when no particulate is present; the broader upgrade for mixed gases is the 60926. Still deciding? Use how to choose a respirator cartridge, the ammonia cartridge guide, and browse all 3M respirator cartridges and filters.

Frequently Asked Questions