Best Honeywell North Cartridge For Ammonia

Best Honeywell North Cartridge for Ammonia

Reviewed by WC Safety Editorial — Last updated: June 2026.

Quick Answer

Ammonia is the one hazard where most cartridges fail: it is an alkaline gas, not an acid gas or organic vapor, so it needs a dedicated ammonia/methylamine sorbent. The Honeywell North answer is the N75004L — or the 7584P100L when particulate is present.

The critical takeaway: a North N75001L (organic vapor) or N75002L (acid gas) gives zero ammonia protection. Only the ammonia-specific N75004L and the ammonia/methylamine 7584P100L cover it. Because ammonia is a severe eye irritant, a full-face respirator is strongly preferred. Full hazard detail is in our best respirator cartridge for ammonia guide.

Understanding the Hazard: Ammonia (NH₃)

Ammonia is a colorless, pungent, alkaline gas used at industrial scale — and its chemistry is exactly why ordinary cartridges do not stop it. Acid-gas sorbents are tuned to neutralize acids; ammonia is a base, so it slips past them. Organic-vapor carbon is tuned for carbon-based solvents; ammonia is inorganic. Only a sorbent specifically impregnated for ammonia and methylamine captures it.

How exposure occurs. Anhydrous ammonia refrigeration systems (food processing, cold storage, ice rinks), fertilizer production and field application, wastewater treatment, chemical manufacturing, and heavy-duty cleaning all release ammonia. Leaks at valves, fittings, and compressors are the classic exposure event.

Short-term risks. Even low concentrations cause stinging eyes, runny nose, and throat irritation. Higher levels cause coughing, chest tightness, chemical burns to the airway, and, at high concentration, life-threatening pulmonary edema. Long-term risks. Repeated exposure can cause chronic respiratory irritation and reactive airway disease.

Why respiratory protection matters. Ammonia’s odor warns at low levels, but workers desensitize, and concentrations during a leak rise far faster than a cartridge can safely handle. The exposure limits frame the program: OSHA PEL 50 ppm, NIOSH REL 25 ppm, IDLH 300 ppm. Common environments: ammonia refrigeration plants, fertilizer facilities, wastewater plants, and agricultural operations.

Which Honeywell North Cartridge Is Best for Ammonia?

Primary recommendation: the N75004L (ammonia/methylamine). This is the dedicated North ammonia cartridge — the correct choice for routine ammonia vapor exposure below the IDLH where no particulate is present. Nothing else in the standard N750 line covers ammonia.

Ammonia plus particulate: the 7584P100L (ammonia/methylamine + P100). When ammonia coexists with dust, mist, or fume, the 7584P100L pairs the same ammonia and methylamine sorbent with a P100 filter. It does not protect against acid gases or organic vapors: if either is in the air as well, the job needs a cartridge approved for every gas present, or supplied air.

Maximum protection: full-face respirator, and supplied air for leaks. Because ammonia attacks the eyes, pair any ammonia cartridge with a North 5400 or North 7600 full-face respirator. For leaks, emergency response, confined-space entry, or any concentration that could exceed 300 ppm, no cartridge qualifies — use SCBA.

Do not use: the N75001L Check Price on Amazon → (organic vapor), N75002L (acid gas), or the P100-only 7580P100 Check Price on Amazon →/75FFP100 as your ammonia protection — none of them stop ammonia gas. When unsure how cartridge categories map to hazards, start with how to choose a respirator cartridge.

Honeywell North Cartridge Comparison Table for Ammonia

Best Honeywell North Cartridges for Ammonia — In Depth

Honeywell North N75004L (Ammonia / Methylamine)

Protection: dedicated ammonia and methylamine sorbent, vapor only. Ideal applications: routine ammonia maintenance in refrigeration, fertilizer, and wastewater work below the IDLH with no particulate. Strengths: the correct, focused cartridge for ammonia, lighter and lower cost than the 7584P100L combination cartridge. Weaknesses: no particulate filter; covers only ammonia and methylamine. Choose it when ammonia vapor is the sole hazard. Do not choose it when dust, mist, or other gases are present. Read the N75004L review.

Honeywell North 7584P100L (Ammonia / Methylamine + P100)

Protection: a dedicated ammonia and methylamine sorbent plus a P100 particulate filter. Ideal applications: ammonia alongside airborne particulate, such as wastewater and mixed process areas. Strengths: one cartridge for ammonia vapor and the dust, mist or fume that comes with it. Weaknesses: heavier and costlier; no acid gas or organic vapor protection; still bound by the ammonia IDLH. Choose it when ammonia and airborne particulate are both present. Do not choose it when pure ammonia vapor makes the N75004L sufficient. Read the 7584P100L review.

Recommended Honeywell North Respirators for Ammonia

Because ammonia is a severe eye irritant, the respirator choice leans heavily toward full-face. All North facepieces accept the ammonia cartridges via the shared bayonet.

For ammonia, default to a North 5400 or North 7600 full-face respirator: ammonia stings the eyes at concentrations well below those that threaten the lungs, and full-face raises the protection factor to 50. A North 7700 or North 5500 half mask with the N75004L and sealed goggles can serve brief, low-level tasks, but it leaves the eyes more exposed. Compare full-face options in the North 5400 vs 7600 comparison and half masks in the North 5500 vs 7700 comparison, and browse all North full-face respirators and North half masks. For leaks and emergency response, none of these qualify — use SCBA, as covered in the Honeywell North cartridge guide.

Common Cartridge Selection Mistakes for Ammonia

1. Using an acid-gas or OV cartridge for ammonia. The single most dangerous ammonia error. Ammonia is alkaline and organic-vapor and acid-gas sorbents do not capture it. Only the ammonia-specific N75004L or the ammonia/methylamine 7584P100L work.

2. Assuming the 75SCP100L covers ammonia. Many multi-gas cartridges omit ammonia. Always verify ammonia appears on the specific cartridge’s NIOSH approval before relying on it.

3. Using a cartridge for a leak. Ammonia leaks blow past the 300 ppm IDLH fast and can displace oxygen. Leaks, emergency response, and unknown concentrations require SCBA, not an N75004L.

4. Choosing a half mask and ignoring the eyes. Ammonia attacks the eyes at low levels. Full-face is the right default; a half mask demands tight goggles and only for brief low-level work.

5. Relying on odor as the change schedule. Ammonia smells strongly, but workers desensitize. Use a written, data-based change schedule under OSHA 1910.134, and replace at any breakthrough smell.

6. Skipping fit testing. A leaking facepiece lets ammonia bypass the cartridge entirely. Fit test under 1910.134(f) and keep the seal clean-shaven.

When Should You Replace North Ammonia Cartridges?

Ammonia cartridges saturate like any sorbent cartridge and must follow a written change schedule. Ammonia’s strong odor is a useful backstop — any breakthrough smell means replace now — but it is not a substitute for a data-based schedule.

Ammonia cartridges are color-coded green. For the full methodology, see how long do respirator cartridges last and OSHA 29 CFR 1910.134; for the color code, see the respirator cartridge color chart. And for chlorine, sulfur dioxide, and other acid gases that often appear in the same facilities, see our best respirator cartridge for acid gas guide.

Related reference

Related reading in this area: honeywell north 7583p100l vs 3m 60923: organic vapor, acid gas & p100, honeywell north n75001l vs n75002l: organic vapor vs acid gas, honeywell north n75002l vs 7582p100l: acid gas vs acid gas/p100 — when, 3m organic vapor cartridges which one do you need, honeywell north 7506r95 vs 7580p100: r95 vs p100 filter comparison, and honeywell north 7580p100 vs 75scp100l: p100 filter vs multi-gas.

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Our methodology

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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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