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Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
Industrial Safety Equipment & PPE — ANSI/OSHA Compliant
May 12, 2026 Updated July 25, 2026 Steven Eaton

Honeywell North N75004L Organic Vapor & Ammonia Cartridge Review: OV+AM Gas-Only for NH₃ Environments

WC Safety Editorial Verdict: 4.3/5

The Honeywell North N75004L earns a 4.3/5 as a correctly-scoped organic vapor + ammonia/methylamine gas-only cartridge: it is the right call when an industrial hygiene assessment confirms ammonia and solvent vapor as the only airborne hazards and formally excludes acid gas. Because it carries no acid gas sorbent and no P100 media, it loses points only on breadth — step up to the honeywell north 75scp100l when particulate or acid gas co-exposure is possible, and confirm your facepiece in our respiratory protection complete guide. We assign an editorial score; WC Safety does not fabricate customer ratings.

Is the Honeywell North N75004L the Right OV+Ammonia Gas-Only Cartridge for Pure Ammonia and Solvent Environments?

The Honeywell North N75004L is a NIOSH-approved organic vapor + ammonia gas-only cartridge — no acid gas coverage, no P100 filter. It covers environments where ammonia and organic solvents are confirmed as the only hazards, and acid gases have been formally excluded by IH assessment. Lighter than N75003L (which adds acid gas), it's appropriate for applications like R-717 refrigeration maintenance combined with lubricant vapor, or poultry facility work where cleaning agents are solvent-based but not acid-generating.

Editorial Verdict — N75004L: 4.3/5
Correct for pure OV+ammonia environments where acid gas is formally excluded. If any uncertainty exists about acid gas presence, N75003L (OV+AG+AM) provides broader gas coverage at minimal additional cost.

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Specifications

Feature Details
Model N75004L
OV Protection Yes — activated carbon
Ammonia/Methylamine Yes
Acid Gas Protection None
Particle Protection None
NIOSH Approval Yes — 42 CFR Part 84

N75004L vs. N75003L: When to Choose Each

Hazard Profile Choose
OV + ammonia only (acid gas excluded) N75004L
OV + ammonia + acid gas present or uncertain N75003L
All above + particles 75SCP100L

Applications

  • Ammonia refrigeration maintenance (R-717) with solvent-based lubricants — no acid gas co-exposure
  • Poultry and livestock facilities where organic compounds and ammonia coexist without acid gases
  • Solvent-heavy ammonia synthesis steps where acid gases are chemically excluded from the process

Compatible with all Honeywell North bayonet respirators including the North 5500 Series half-face, North 7600 and 5400 Series full-face respirators. Not compatible with 3M bayonet respirators — Honeywell North and 3M use different mounting systems.

Browse all Honeywell North respirator cartridges or see the full respirator cartridge and filter selection at WC Safety.

Frequently Asked Questions

Q: What does N75004L protect against?

A: Organic vapors and ammonia/methylamine. No acid gas or particulate protection.

Q: How does N75004L differ from N75003L?

A: N75003L adds acid gas (HCl, HF, SOâ‚‚, Clâ‚‚) protection. If any acid gas co-exposure is possible, N75003L is the safer choice.

Q: Why would I choose N75004L instead of N75003L?

A: If your IH assessment formally confirms no acid gas hazard and you want lower breathing resistance or cost. The difference is usually small — when in doubt, N75003L covers more.

Q: Does N75004L protect against acid gases like HCl or SOâ‚‚?

A: No — the N75004L has no acid gas sorbent. For acid gas environments, use N75002L, N75003L, or 75SCP100L.

Q: Is N75004L appropriate for poultry processing?

A: Yes for pure ammonia + organic vapor environments. If chlorine-based sanitizers are also used, the acid gas exposure from Clâ‚‚ means N75003L or 75SCP100L is more appropriate.

Q: What respirators use N75004L?

A: Honeywell North bayonet respirators: 5500 half-face, 7600 full-face, 5400 full-face.

Q: Is N75004L NIOSH-approved?

A: Yes — 42 CFR Part 84 for OV + ammonia/methylamine.

Q: How do I know when to replace N75004L cartridges?

A: Replace on ammonia odor detection or per written change schedule. OSHA requires documented change schedules.

Q: Where can I buy the N75004L?

A: At WC Safety. See all North cartridges.

OSHA 1910.134 Cartridge Change Schedule Requirements

OSHA 29 CFR 1910.134(d)(3)(iii)(B) requires that atmospheres immediately dangerous to life or health (IDLH), oxygen-deficient atmospheres, and environments with gas or vapor cartridges must have a cartridge change schedule based on objective information. Specifically, the standard requires:

  • A written change schedule based on objective data — measured concentrations, published service life tables, or ESLI (end-of-service-life indicator) performance data
  • The change schedule must address the specific chemicals present, their concentrations, temperature, humidity, and work rate
  • Immediate replacement when the wearer detects any odor, taste, or irritation through the cartridge — this indicates breakthrough and potential saturation
  • Cartridges must be replaced before being stored and reused — carbon that has partially adsorbed contaminants may release them during storage and re-entry
  • Written records of the change schedule must be made available to employees upon request

Failure to maintain a written cartridge change schedule is one of the most commonly cited OSHA violations in respiratory protection programs. If you are building or auditing a respiratory protection program, the OSHA Small Entity Compliance Guide for Respiratory Protection (OSHA 3384) provides a detailed walkthrough of change schedule requirements.

OSHA Assigned Protection Factors: Respirator Type Determines Protection Level

A critical and frequently misunderstood principle: the protection factor (APF) is determined by the respirator type, not the cartridge. The cartridge determines which chemicals are protected against; the facepiece type determines how much protection is provided relative to the permissible exposure limit (PEL).

Respirator Type OSHA APF (29 CFR 1910.134 App A)
Half-face air-purifying (e.g., North 5500 Series) APF 10 — protects up to 10× the PEL
Full-face air-purifying (e.g., North 7600/5400 Series) APF 50 — protects up to 50× the PEL
Powered air-purifying (PAPR), half-face APF 50
Powered air-purifying (PAPR), full-face/hood APF 1000

Example: if the OSHA PEL for a solvent is 100 ppm, a half-face respirator (APF 10) with the appropriate cartridge protects up to 1,000 ppm; a full-face (APF 50) protects up to 5,000 ppm. If your measured air concentration exceeds the APF × PEL product, you need a higher APF respirator or must implement engineering controls to reduce concentration.

Refrigeration Safety Standards and Ammonia Respirator Requirements

Industrial refrigeration using ammonia (R-717) is among the highest-consequence industrial processes for respiratory hazard. The N75004L is appropriate for routine maintenance, but the full safety framework includes:

  • ANSI/ASHRAE 15: Safety Standard for Refrigeration Systems — requires emergency shutoff, ventilation, and appropriate personal protective equipment including respiratory protection for ammonia system work
  • ANSI/IIAR 2: Equipment, Design, and Installation of Closed-Circuit Ammonia Mechanical Refrigeration — specifies PPE and emergency equipment requirements for ammonia systems
  • OSHA 29 CFR 1910.119: Process Safety Management (PSM) applies to facilities with >10,000 lb of ammonia — includes requirements for emergency action plans, process hazard analysis, and incident investigation
  • EPA RMP (40 CFR Part 68): Risk Management Program applies to facilities with >10,000 lb of anhydrous ammonia — accidental release prevention and emergency response planning required

For routine maintenance where ammonia concentrations are controlled and measured, the N75004L on a North half-face respirator provides appropriate protection. For emergency response (major leak, system failure), SCBA is the required equipment — never respond to an unknown or large ammonia leak with a cartridge respirator.

Organic Vapor Co-Exposure in Ammonia Refrigeration Environments

The N75004L's OV component addresses a frequently overlooked co-exposure in refrigeration maintenance:

  • Refrigeration oils: R-717 systems use polyalkylene glycol (PAG) or alkyl benzene (AB) lubricating oils. These oils generate low-level OV vapors, particularly when equipment is hot or during oil service. The OV component of N75004L captures these vapors
  • Cleaning solvents: refrigeration system maintenance often involves using solvent-based cleaners (degreasers, contact cleaners). The OV component provides protection during these operations
  • Brazing and welding fumes: system repair involving brazing or welding generates OV from flux plus metal fume particles — for welding applications, the 75SCP100L with P100 is more appropriate

Selecting the Right Honeywell North Respirator for Your Cartridge

North bayonet cartridges work with three respirator product lines. Selecting the correct respirator determines your protection level:

  • North 5500 Series half-face: APF 10; available in S, M, L sizes; silicone facepiece; recommended for most industrial environments with exposures ≤10× PEL
  • North 7600 Series full-face: APF 50; panoramic lens; appropriate for IDLH environments below IDLH concentration when combined with correct cartridges; also provides eye protection
  • North 5400 Series full-face: APF 50; traditional lens design; often used in specialty industrial applications requiring specific optical characteristics

For all respirator-cartridge combinations, the facepiece must be NIOSH-approved as part of an approved assembly. Verify compatibility in the NIOSH NPPTL Certified Equipment List (CEL) before deploying a new combination in your respiratory protection program.

Additional Frequently Asked Questions

Q: What is the ammonia detector rating required before N75004L use?

A: Before entering an ammonia environment for maintenance, a direct-reading ammonia detector should confirm concentrations are below IDLH (300 ppm) and within APF limits for the respirator being used. Fixed detection systems and portable personal monitors are both used; ANSI/ASHRAE 15 specifies detector sensitivity and alarm setpoints for refrigeration spaces.

Q: Can the N75004L be used for poultry house litter inspection?

A: Poultry house litter inspection involves ammonia from decomposing manure plus organic dust from feathers, dander, and litter material. The N75004L covers ammonia gas but has no particle filtration — if organic dust is a concern (which it typically is in poultry houses), the 75SCP100L (OV+AG+AM+P100) is more appropriate for comprehensive protection.

Q: Is there a combination cartridge equivalent to N75004L but with P100?

A: The 7584P100L is the ammonia + P100 combination (no OV coverage). For OV + ammonia + P100 with no acid gas, there is no dedicated North cartridge — the 75SCP100L (OV+AG+AM+P100) is the closest, adding acid gas coverage alongside OV+AM+P100.

Q: What is methylamine and why is it included in the N75004L approval?

A: Methylamine (CH₃NH₂) is the simplest organic amine, structurally similar to ammonia with one hydrogen replaced by a methyl group. It is found in fish processing, some chemical synthesis, and as a degradation product in various organic processes. The ammonia sorbent in the N75004L also captures methylamine. If trimethylamine or dimethylamine are present, verify the specific NIOSH approval language.

Q: Does N75004L provide any protection against hydrogen sulfide?

A: The N75004L has no NIOSH approval for Hâ‚‚S. While some activated carbon sorbents adsorb limited amounts of Hâ‚‚S, this cannot be relied upon for worker protection. In environments where ammonia and Hâ‚‚S co-occur (manure storage, wastewater), the Hâ‚‚S hazard must be addressed through dedicated monitoring and appropriate respiratory selection beyond the N75004L's capabilities.

Q: How does organic vapor concentration affect N75004L service life?

A: Higher organic vapor concentrations deplete activated carbon capacity faster. In high-solvent-concentration environments (active solvent cleaning, high-vapor-pressure solvent handling), the OV component of N75004L may reach breakthrough sooner than the ammonia component. Base your change schedule on the shorter of the two service life estimates for the specific chemicals present.

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Disclosures & editorial standards
WC Safety participates in the Amazon Services LLC Associates Program. Outbound Amazon links are affiliate links. We accept no manufacturer payment, sponsorship, or product samples. This content is not medical, legal, or regulatory advice. Safety equipment selection is governed by applicable OSHA standards and your facility's safety program.

Pros & Cons

Pros
  • Genuine NIOSH-approved (42 CFR Part 84) organic vapor + ammonia/methylamine gas-only protection in one cartridge
  • Lighter and lower breathing resistance than the acid-gas-added N75003L sibling for pure OV+ammonia work
  • Snaps onto the Honeywell North bayonet system shared by 5500 half-face and 7600/5400 full-face facepieces
  • Well-matched to confirmed R-717 ammonia refrigeration maintenance and solvent-based poultry/cleaning vapor tasks
  • Sold as a paired set, so both bayonet ports on a North facepiece stay balanced
  • Clean, single-purpose sorbent stack with no particulate prefilter to clog or replace separately
Cons
  • No acid gas sorbent — wrong choice anywhere HCl, SO2, Cl2 or HF co-exposure is possible
  • No P100 filter, so it offers zero protection against dusts, mists, fumes or aerosols
  • Honeywell North bayonet only — will not fit 3M, Moldex or other brand facepieces
  • No end-of-service-life indicator (ESLI), so change-out must be driven by an OSHA schedule, not smell

Who It's For

Buy it if:

  • IH-assessed ammonia refrigeration (R-717) crews whose only confirmed hazards are NH3 and lubricant/solvent vapor
  • Poultry and food-processing workers exposed to ammonia plus solvent-based (non-acid) cleaning agents
  • Honeywell North 5500, 7600 or 5400 facepiece users who need OV and ammonia coverage without P100 weight
  • Safety managers who want a single cartridge covering both organic vapor and ammonia/methylamine

Look elsewhere if:

  • Anyone with possible acid gas (chlorine sanitizer, SO2, HCl) co-exposure — choose N75003L or 75SCP100L instead
  • Workers needing particulate protection against dust, mist or welding fume — this cartridge has no filter
  • Owners of 3M, Moldex or other non-North facepieces, since the bayonet mount is brand-specific

Related Resources

Frequently Asked Questions

How do I decide between the N75004L and a combination cartridge with P100?

Base it on whether airborne particulates are present. The N75004L is gas-only (organic vapor + ammonia/methylamine), so it is the leaner pick when an IH assessment confirms only vapors and gases. If any dust, mist, or aerosol is in the air, you need P100 media — step to the 75SCP100L combination cartridge reviewed in our honeywell north 75scp100l writeup.

Is the N75004L a good value compared with stacking separate gas and particulate cartridges?

For pure gas/vapor exposures it is efficient value because one cartridge handles both organic vapor and ammonia. But it carries no particulate filter, so it does not replace a P100 stack — if you need both gas and particulate coverage you are buying a combination unit instead. Confirm your hazard list against our how to choose a respirator cartridge guide before comparing on price.

Which Honeywell North particulate filter do I add if I later need P100 with the N75004L?

The N75004L itself has no particulate media, and you cannot simply bolt a generic filter to a gas-only cartridge to create a NIOSH approval. For an approved particulate option on the North bayonet system, look at the dedicated P100 discs and cartridges covered in our honeywell north 7580p100 and honeywell north 75ffp100 reviews, or use a factory combination cartridge.

How does the N75004L compare to a straight organic-vapor-only North cartridge?

A plain OV cartridge covers solvent vapors but offers no ammonia or methylamine protection. The N75004L adds that ammonia/methylamine sorbent, which is the whole reason to choose it for refrigeration or poultry work. If ammonia is not in your exposure profile, the extra sorbent is unnecessary cost; if it is, the N75004L is the correct single-cartridge answer.

Does the N75004L cover the same hazards as a multi-gas cartridge?

No. Multi-gas cartridges typically combine organic vapor, acid gas, ammonia, and sometimes formaldehyde. The N75004L deliberately omits acid gas. If your environment could include acid gases, a broader multi-gas or the acid-gas-added N75003L is the safer specification — review the selection logic in our respiratory protection complete guide.

For ammonia refrigeration maintenance, is the N75004L enough on its own?

It is appropriate only after an industrial hygiene assessment confirms ammonia plus organic (lubricant/solvent) vapor as the hazards and rules out acid gas and particulates. It is also strictly for escape or controlled below-IDLH work — ammonia engine rooms can reach IDLH levels that require supplied air, never an air-purifying cartridge. Cross-check assigned protection factors before relying on it.

How does fit between the N75004L and N75003L affect my buying decision?

Both share the identical Honeywell North bayonet mount and the same facepieces, so the choice is purely about hazard coverage, not fit. Pick the N75004L when acid gas is formally excluded and you want lighter breathing resistance; pick the N75003L when there is any chance of acid gas. There is no facepiece compatibility penalty either way.

Can I mix an N75004L on one bayonet and a different cartridge on the other?

No. NIOSH approvals are issued for matched pairs of the same cartridge, and dual-port facepieces are designed to be loaded with two identical units for balanced airflow and a valid approval. Mixing a gas cartridge with, for example, a P100 disc on the opposite port voids the approval. Always run two N75004L cartridges together.

Is the N75004L the right cartridge for spray-painting or solvent finishing?

It will capture the organic solvent vapors from many coatings, but most spray operations also generate paint mist, which is a particulate the N75004L cannot stop. For spray finishing you almost always need an organic vapor cartridge paired with P100 prefilter media, so a combination setup is the better fit than this gas-only unit.

How do I confirm the N75004L is compatible with my exact North facepiece before buying?

Verify your mask uses the Honeywell North bayonet connector (the 5500 half-mask and 7600/5400 full-face families do) rather than a screw-thread or another brand's mount. North bayonet cartridges do not cross over to 3M or Moldex. Our honeywell north 7581p100l review walks through identifying the bayonet system on these facepieces.

Without an ESLI, how should I judge whether the N75004L is the economical choice for my schedule?

The N75004L has no end-of-service-life indicator, so you cannot rely on a color-change window to stretch its life. Service life is driven by your change-out schedule, concentration, humidity, and work rate. If you want indicator-based change-out, factor that into the comparison using our respirator cartridge esli guide before deciding the N75004L is the cheapest option.

Is the N75004L overkill if I only need organic vapor protection?

Yes, slightly. If ammonia and methylamine are genuinely absent from your exposure, you are paying for sorbent capacity you will not use, and a plain organic vapor cartridge would suffice. The N75004L earns its place specifically when both organic vapor and ammonia are confirmed present, which is its intended niche.

How does the N75004L stack up against the P100 cartridges in the North lineup for my application?

They solve different problems and are not interchangeable. The P100 units, such as those in our honeywell north 7582p100l and honeywell north 7583p100l reviews, stop particulates and have no gas sorbent; the N75004L stops gases and vapors and has no filter. Choose by whether your hazard is a particulate, a gas, or both.

For a facility that handles both ammonia and chlorine sanitizers, is the N75004L the wrong call?

Yes. Chlorine is an acid gas, and the N75004L has no acid gas sorbent. A site using both ammonia and chlorine-based sanitation should specify a cartridge that adds acid gas coverage, such as the N75003L, or a P100 combination like the one in our honeywell north 75scp100l review.

Where does the N75004L fit in a broader respiratory protection program?

It is a single hazard-specific tool, not an all-purpose cartridge. In a managed program it serves confirmed ammonia-plus-organic-vapor tasks while other cartridges cover acid gas, particulate, and combination needs. Build the full picture using the respiratory protection complete guide and the broader respiratory protection range, and compare brands such as the cartridges in our honeywell north 7584p100l and honeywell north 75852p100l reviews, plus the moldex respirator cartridges and filters for non-North systems.

Why trust WC Safety
Industrial PPE specialists. We do not accept manufacturer payment for placement.
Reviewed by
Steven Eaton, WC Safety Editorial — guidance reflects current OSHA, NIOSH and ANSI practice.
Our standards
Ratings combine published specs, hands-on familiarity, and verified customer data where available; we do not fabricate lab tests.
Affiliate disclosure
Some links are Amazon affiliate links (tag wcsafety04-20); purchases may earn us a commission at no cost to you.
Filed in: ammonia, gas-only, honeywell north, methylamine, N75004L, NIOSH, organic vapor, product review, refrigeration, respirator cartridges
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