Honeywell North N75004L Organic Vapor & Ammonia Cartridge Review: OV+AM Gas-Only for NH₃ Environments
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.
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.
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, SO₂, Cl₂) 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 SO₂?
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 Cl₂ 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 H₂S. While some activated carbon sorbents adsorb limited amounts of H₂S, this cannot be relied upon for worker protection. In environments where ammonia and H₂S co-occur (manure storage, wastewater), the H₂S 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.
Shop and Learn More on WCSafety.com
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- 3M 60928 OV+Acid Gas+P100 Combination Cartridge
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.
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.