Best Honeywell North Cartridge for Ammonia (2026)
Best Honeywell North Cartridge for Ammonia
Reviewed by WC Safety Editorial Team — 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 N75003L — or the 7584P100L when particulate is present.
| User | Best North Cartridge | Why |
|---|---|---|
| Most users (ammonia vapor) | N75003L (ammonia/methylamine) | Dedicated ammonia sorbent; others do not work |
| Ammonia + dust/mist/fume | 7584P100L (multi-gas + P100) | Ammonia coverage plus particulate filter |
| Ammonia + acid gases | 7584P100L | Broadest North scope: OV + AG + ammonia + P100 |
| Leak / above 300 ppm / unknown | Supplied air or SCBA | No cartridge is rated above the IDLH |
The critical takeaway: a North N75001L (organic vapor) or N75002L (acid gas) gives zero ammonia protection. Only the ammonia-specific N75003L and the multi-gas 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 N75003L (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 (multi-gas + P100). When ammonia coexists with dust, mist, or fume — or with acid gases and organic vapors — the 7584P100L spans all of them and adds a P100 filter. It is the broadest single North cartridge for mixed ammonia environments.
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 (organic vapor), N75002L (acid gas), or the P100-only 7580P100/75FFP100 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
| Cartridge / Filter | Protection Type | P100 | Suitable for Ammonia? | Strengths | Limitations | Recommended Use |
|---|---|---|---|---|---|---|
| N75003L | Ammonia / methylamine | No | Yes — ideal | Dedicated ammonia sorbent | No particulate protection | Ammonia vapor only |
| 7584P100L | OV + AG + ammonia + P100 | Yes | Yes — broad | Ammonia + gases + particulate | Higher cost, heavier | Ammonia + mixed hazards |
| N75001L | Organic vapor | No | No | Solvent vapor | Zero ammonia protection | Solvents — not ammonia |
| N75002L | Acid gas | No | No | Acid gases | Zero ammonia protection | Chlorine, SO₂ — not ammonia |
| N75004L | Formaldehyde | No | No | Formaldehyde | Zero ammonia protection | Labs — not ammonia |
| 75SCP100L | Multi-contaminant + P100 | Yes | Verify approval | Broad gas + particulate | Ammonia not always covered | Confirm ammonia on approval |
| 75SCL | Multi-gas (no P100) | No | Verify approval | Multi-gas vapor | Confirm ammonia coverage | Mixed gases — verify NH₃ |
| 7580P100 | P100 particulate | Yes | No | Dust capture | Zero gas protection | Dust — not ammonia |
| 7581P100L | OV + P100 | Yes | No | OV + dust | No ammonia sorbent | Paint — not ammonia |
| 7583P100L | OV + AG + P100 | Yes | No | OV + acid gas + dust | No ammonia sorbent | 2K paint — not ammonia |
Best Honeywell North Cartridges for Ammonia — In Depth
Honeywell North N75003L (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 multi-gas option. 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 N75003L review.
Honeywell North 7584P100L (OV + Acid Gas + Ammonia + P100)
Protection: the broadest North multi-gas blend — organic vapor, acid gas, and ammonia — plus a P100 filter. Ideal applications: ammonia alongside particulate, acid gases, or solvents, such as wastewater and mixed process areas. Strengths: one cartridge for ammonia and almost everything else. Weaknesses: heavier and costlier; still bound by every gas’s IDLH. Choose it when ammonia is one of several hazards. Do not choose it when pure ammonia vapor makes the N75003L 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.
| Respirator | Type / APF | Best Ammonia Use |
|---|---|---|
| North 5400 | Full face / APF 50 | Preferred — protects eyes, higher APF |
| North 7600 | Full face (silicone) / APF 50 | Premium ammonia work, long shifts |
| North 7700 | Half mask / APF 10 | Brief low-level work with tight goggles |
| North 5500 | Half mask / APF 10 | Economical low-level tasks with goggles |
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 N75003L 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 N75003L or the multi-gas 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 N75003L.
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.
| Condition | Replace When | Notes |
|---|---|---|
| Ammonia cartridge (N75003L / 7584P100L) | Per change schedule; immediately at odor/irritation | Strong odor warns of breakthrough — act on it |
| P100 layer (7584P100L) | When breathing resistance rises | Mechanical loading, separate from gas saturation |
| High concentration / heavy use | Sooner than baseline | Sorbent saturates faster at higher exposure |
| High humidity | Sooner than baseline | Moisture competes for sorbent capacity |
| Stored / unopened | By printed expiration date | Sorbent degrades over years even sealed |
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.
Frequently Asked Questions
What Honeywell North cartridge is best for ammonia?
Ammonia requires a dedicated ammonia/methylamine sorbent — the Honeywell North N75003L. Organic-vapor and acid-gas cartridges do NOT protect against ammonia. When particulate is also present, use the 7584P100L, which combines ammonia coverage with a P100 filter. Confirm levels are below the 300 ppm ammonia IDLH; above that, use supplied air or SCBA.
Does an acid-gas or organic-vapor cartridge work for ammonia?
No. Ammonia is a basic (alkaline) gas, not an acid gas or an organic vapor, so neither the N75001L (OV) nor the N75002L (acid gas) protects against it. You must use a cartridge with a dedicated ammonia/methylamine sorbent — the N75003L, or the multi-gas 7584P100L.
Does the 75SCP100L protect against ammonia?
Not reliably. The North 75SCP100L multi-contaminant cartridge is built around organic vapor, acid gases, and formaldehyde — ammonia is generally not part of its approval. For confirmed ammonia protection, use the dedicated N75003L or the 7584P100L. Always verify ammonia appears on the cartridge’s current NIOSH approval before relying on it.
What North cartridge do I use for ammonia plus particulate?
Use the 7584P100L, which combines multi-gas coverage — including ammonia — with a P100 particulate filter. This is the right choice in environments with ammonia plus dust, mist, or fume. The dedicated N75003L covers ammonia vapor only and has no particulate filter.
What is the OSHA exposure limit for ammonia?
OSHA’s permissible exposure limit for ammonia is 50 ppm as an 8-hour TWA; the NIOSH recommended limit is 25 ppm TWA with a 35 ppm short-term limit, and the IDLH is 300 ppm. Respirator selection must follow the measured concentration; above the IDLH only supplied air or SCBA is acceptable.
Can I use a cartridge respirator for an ammonia leak?
No — not for an active or unknown-concentration leak. Anhydrous ammonia releases can rapidly exceed the 300 ppm IDLH and displace oxygen. Above the IDLH, in oxygen-deficient atmospheres, or at unknown concentration, OSHA 1910.134 requires supplied air or SCBA. An N75003L cartridge is only for known concentrations below the IDLH.
Do I need a full-face respirator for ammonia?
Full-face is strongly preferred. Ammonia is a severe eye and mucous-membrane irritant even at low concentrations, so a full-face North 5400 or 7600 protects the eyes and gives a higher protection factor of 50. A half mask with the N75003L plus tight goggles may suit brief, low-level tasks, but full-face is the safer default.
How long does a North ammonia cartridge last?
Ammonia cartridges saturate over time and must be replaced on a written change schedule under OSHA 1910.134(d)(3). Ammonia has a strong, low-threshold odor that gives some warning, but warning properties alone are not an acceptable change schedule. Replace immediately at any odor or irritation through the mask, and base the schedule on documented exposure data.
Where is ammonia exposure most common?
Industrial refrigeration (anhydrous ammonia systems in food processing and cold storage), fertilizer manufacturing and agriculture, wastewater treatment, chemical production, and some heavy-duty cleaning operations. Refrigeration leaks are the classic high-risk scenario and frequently require SCBA, not cartridges.
Are Honeywell North ammonia cartridges NIOSH approved?
Yes. The N75003L (ammonia/methylamine) and the 7584P100L (multi-gas including ammonia, with P100) are NIOSH-approved under 42 CFR Part 84. Use them within their NIOSH approval and an OSHA 1910.134 respiratory protection program.
Can North ammonia cartridges fit a 3M respirator?
No. North cartridges fit only North facepieces via the North bayonet. They will not seal on a 3M, MSA, or Moldex respirator. The 3M equivalent for ammonia is the 6004 cartridge, but it is not interchangeable with North facepieces.
What is the difference between the N75003L and 7584P100L?
The N75003L is an ammonia/methylamine cartridge — vapor only, no particulate filter. The 7584P100L is a multi-gas cartridge that includes ammonia coverage plus a P100 filter, so it also protects against dust, mist, and fume. Use the N75003L for pure ammonia vapor and the 7584P100L when particulate is present.
Can North ammonia cartridges be reused?
An ammonia cartridge can be reused across its change schedule if resealed airtight between uses, but the sorbent continues to age once opened. Because ammonia gives a strong odor, any breakthrough smell means the cartridge is spent — replace it. Never share cartridges between workers.
What size North respirator should I buy for ammonia?
North respirators come in small, medium, and large; most adults fit medium, but only a fit test under OSHA 1910.134(f) confirms it. Given ammonia’s severe irritancy, a confirmed seal and a clean-shaven sealing surface are critical — and full-face is generally preferred for eye protection.
Is ammonia dangerous to breathe?
Yes. Ammonia is a corrosive, alkaline gas. Low concentrations irritate the eyes, nose, and throat; higher concentrations cause coughing, airway burns, and pulmonary edema; and very high concentrations can be rapidly fatal. Its strong odor is a warning, but workers can desensitize, so do not rely on smell as your control.
Can I use the N75003L for refrigeration ammonia work?
For routine, low-level ammonia maintenance below the IDLH, the N75003L (or 7584P100L with particulate) on a full-face respirator is appropriate. But ammonia refrigeration leaks and emergency response routinely exceed the 300 ppm IDLH, which requires SCBA. Match the respirator to the task: cartridges for controlled work, supplied air for leaks.
Does ammonia require a special cartridge color?
Ammonia cartridges are color-coded green under ANSI/ISEA 110. Multi-gas cartridges that include ammonia carry several bands, and a P100 combination adds a magenta band. See our respirator cartridge color chart for the full code.
How do I know when my ammonia cartridge is bad?
Replace immediately if you smell ammonia or feel eye or nose irritation through the mask — that is breakthrough. Also replace on your written change schedule, when breathing resistance rises on a P100 combination, or if the cartridge is wet, damaged, or expired.
Can one North cartridge cover ammonia and acid gases together?
The 7584P100L is the North cartridge that spans organic vapor, acid gas, and ammonia plus P100, making it the broadest single choice for mixed ammonia-and-acid-gas environments. Verify every gas present appears on its NIOSH approval, and remember no cartridge is valid above any contaminant’s IDLH.
What respirator do I need for wastewater ammonia?
Wastewater can produce ammonia along with hydrogen sulfide and other gases, so a broad multi-gas cartridge such as the 7584P100L on a full-face respirator is the practical choice — but confined-space and high-concentration entries require supplied air or SCBA. Always test the atmosphere first.
Where can I learn more about ammonia cartridge selection?
See our complete Honeywell North cartridge guide for the full selection chart, and our brand-neutral best respirator cartridge for ammonia guide for exposure limits and cross-brand options. For cartridge categories generally, read how to choose a respirator cartridge.
More Honeywell North Cartridge Resources
- Honeywell North Cartridge Guide — the full pillar: every model, chart, and replacement schedule
- Best Honeywell North Filters & Cartridges — overview and lineup
- Best Respirator Cartridge for Ammonia — brand-neutral limits and options
- Best Respirator Cartridge for Acid Gas • Best Respirator Cartridge for Chlorine
- How to Choose a Respirator Cartridge • Organic Vapor vs P100
- Shop Honeywell North cartridges • North full-face respirators
Disclosures & editorial standards
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links on this page are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Respiratory protection must be based on a documented workplace hazard assessment and fit testing under OSHA 29 CFR 1910.134. Above a contaminant's IDLH, only supplied-air or SCBA is acceptable. Consult a Certified Industrial Hygienist (CIH) for site-specific guidance.
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links on this page are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Respiratory protection must be based on a documented workplace hazard assessment and fit testing under OSHA 29 CFR 1910.134. Above a contaminant's IDLH, only supplied-air or SCBA is acceptable. Consult a Certified Industrial Hygienist (CIH) for site-specific guidance.