Honeywell North N75004L Ammonia & Methylamine Respirator Cartridge

Honeywell North N75004L Overview

The Honeywell North N75004L is a NIOSH-approved ammonia and methylamine gas cartridge that protects against ammonia (NH₃) and methylamine vapors on North bayonet respirators. Sold as a pair, it uses the universal North bayonet connection that fits every facepiece in the North 5500 half-face, 7700 half-face, 5400 full-face, and 7600 full-face series. It is a gas-only cartridge — it contains no particulate filter media and stops no dust, mist, or fumes — and it is rated for ammonia and methylamine only, not organic vapors, acid gases, or mercury vapor.

The N75004L belongs to the N-Series gas-only cartridge line, which includes the N75001L (organic vapor), the N75002L (acid gas), and the N75003L (OV + acid gas). When particulate accompanies the ammonia hazard, the correct upgrade is the 7584P100L ammonia/methylamine + P100 combination cartridge. For multi-gas environments, see the 75SCL Defender multi-gas cartridge. To understand how gas class maps to cartridge selection, read the Honeywell North cartridge guide and the how to choose a respirator cartridge guide, or browse the full Honeywell North respirator filters and cartridges collection.

Where the N75004L Fits in Respirator Selection

The N75004L serves one purpose: ammonia and methylamine gas control on a North bayonet respirator when no other chemical co-hazard is present. Before ordering, confirm two things — that your facepiece is a North bayonet model, and that your hazard assessment shows ammonia or methylamine as the only airborne contaminant.

• North bayonet + ammonia/methylamine only → the N75004L is the correct cartridge.
• North bayonet + ammonia + particulate/dust → the 7584P100L ammonia/methylamine + P100 combination adds particulate protection.
• North bayonet + multiple gases (OV + acid gas + ammonia) → the 75SCL Defender multi-gas cartridge or the 75SCP100L multi-contaminant + P100.
• North bayonet + organic vapor only → the N75001L organic vapor cartridge.
• North bayonet + acid gas only → the N75002L acid gas cartridge.
• Not sure which cartridge class applies? The respirator filter types explained guide and the respirator cartridge color chart walk through the classification logic.

Who Should Buy the Honeywell North N75004L?

Buy the N75004L if you run a Honeywell North bayonet respirator and your workplace hazard assessment identifies ammonia or methylamine as the only chemical airborne hazard — common in agricultural facilities, refrigeration maintenance (NH₃ systems), wastewater treatment, aquaculture, and chemical manufacturing where ammonia is the primary gas concern.

Choose a different cartridge if:

• Dust, mist, or aerosols also accompany the ammonia → the 7584P100L (ammonia/methylamine + P100) adds full particulate filtration.
• Organic vapors are a co-hazard → the 75SCL Defender multi-gas cartridge covers multiple gas classes in one cartridge.
• Mercury vapor or chlorine are also present → the 75852P100L mercury vapor/chlorine + P100 cartridge.
• You run a 3M, Moldex, or any non-North respirator → the North bayonet is not interchangeable with other brands; North cartridges will not seat on other manufacturers' facepieces.

What Does the N75004L Protect Against?

What the N75004L Does NOT Protect Against

• Organic vapors (solvents)
• Acid gases (Cl₂, HCl, SO₂)
• Particulate / dust / mist
• Mercury vapor
• Formaldehyde
• Carbon monoxide
• Hydrogen fluoride
• Multi-gas environments
• Oxygen deficiency
• IDLH atmospheres

Safety: The N75004L is rated for ammonia and methylamine only and provides no protection against organic vapors, acid gases, particulate, or other gas classes. No cartridge supplies oxygen or protects in oxygen-deficient, unknown, or immediately dangerous to life or health (IDLH) atmospheres — those require supplied air, SCBA, or another control specified by a qualified safety professional. When dust or particulate accompanies the ammonia hazard, the 7584P100L (ammonia/methylamine + P100) is the correct selection. The N75004L fits only the North bayonet platform and cannot be installed on 3M, Moldex, or any other brand of respirator.

Best Applications for the N75004L

Refrigeration Maintenance (Anhydrous Ammonia Systems)

Industrial refrigeration plants using anhydrous ammonia (R-717) generate high-concentration NH₃ release risk during maintenance, valve work, and leak response. The N75004L provides ammonia-specific vapor protection for North bayonet respirator programs at these facilities. When dust or corrosion particulate is also a concern in mechanical spaces, pair the 7584P100L for combined ammonia + P100 protection. Browse all North options in the Honeywell North respirator filters and cartridges collection.

Agriculture — Confined Animal Facilities and Fertilizer Handling

Ammonia off-gassing in poultry houses, hog confinements, dairy barns, and anhydrous fertilizer application creates sustained NH₃ exposure. The N75004L delivers targeted ammonia protection for routine entry and short-duration tasks in these environments when the hazard assessment confirms ammonia as the primary chemical hazard and concentrations are within OSHA-permitted cartridge use limits. See the best Honeywell North respirator filters and cartridges guide for a broader selection overview.

Wastewater Treatment and Biogas Facilities

Wastewater treatment plant operators and biogas facility workers frequently encounter ammonia in digester off-gas, sludge processing areas, and aeration tanks. The N75004L is a precise single-gas cartridge for these tasks where ammonia is the documented chemical hazard. Consult the cartridge selection guide to confirm your specific task qualifies for cartridge-type respirator protection versus supplied air before ordering.

Chemical Manufacturing and Laboratory Use

Process chemists and operators handling ammonia solutions, ammonium compounds, or methylamine derivatives in synthesis and quality control applications use the N75004L when the risk assessment identifies these gases as the sole vapor hazard. For laboratories or process lines where organic solvents and ammonia co-exist, the 75SCL Defender multi-gas cartridge provides broader multi-contaminant coverage on the same North bayonet platform.

Honeywell North N75004L Pros & Cons

Compatible Honeywell North Respirators

The N75004L uses the universal North bayonet connection, which is shared by every cartridge and filter in the Honeywell North line. It is not compatible with 3M bayonet, Moldex bayonet, or any other respirator manufacturer's connection system.

The North bayonet connection is brand-specific and not interchangeable with other manufacturers' systems. Browse the full range of compatible cartridges in the Honeywell North respirator filters and cartridges collection.

N75004L vs Other Honeywell North Gas Cartridges and Filters

N75004L vs 7584P100L

This is the most common ammonia cartridge purchase decision in the North line. Both protect against ammonia and methylamine, but the 7584P100L adds a P100 particulate filter layer — making it the correct choice when dust, aerosols, or fumes accompany the ammonia hazard. In agricultural settings, refrigeration plant maintenance areas with corrosion debris, or any environment where both gas and particulate are present, the 7584P100L is the safer selection. If your hazard assessment confirms ammonia or methylamine as the only contaminant with no particulate component, the N75004L delivers the same NH₃ protection at a lower cost per pair.

N75004L vs 75SCL Defender

The 75SCL Defender is a broad-spectrum multi-gas cartridge that covers organic vapor, acid gas, ammonia, methylamine, and additional gas classes in one cartridge, making it the right tool when multiple distinct chemical hazards are present in the same work environment. Choose the N75004L when ammonia or methylamine is the sole documented gas hazard and you want a simpler, lower-cost cartridge with straightforward end-of-service-life management. Choose the 75SCL when task analysis reveals mixed chemical exposures or when a single cartridge needs to cover multiple process areas. Consult the Honeywell North cartridge guide for the full decision framework.

N75004L vs N75001L (Organic Vapor)

The N75004L and the N75001L are both gas-only N-Series cartridges on the same North bayonet platform, but they protect against completely different chemical classes. The N75001L uses activated carbon adsorbent rated for organic vapor (solvents, hydrocarbons, ketones); the N75004L uses a different adsorbent specifically rated for ammonia and methylamine. The two are not interchangeable — select the cartridge that matches the chemical class identified in your workplace hazard assessment. See the respirator cartridge color chart to verify NIOSH color coding for each class.

Honeywell North N75004L Quick Answers

What is the Honeywell North N75004L?

The Honeywell North N75004L is a NIOSH-approved ammonia and methylamine gas cartridge for the North bayonet respirator platform. It protects against ammonia (NH₃) and methylamine vapors only — it contains no particulate filter media and provides no protection against organic vapors, acid gases, or other chemical classes. It is sold as a pair and fits all North 5500, 7700, 5400, and 7600 series facepieces via the universal North bayonet connection.

What respirators does the N75004L fit?

The N75004L fits all Honeywell North respirators using the universal North bayonet connection: the North 5500 half-face series, the North 7700 half-face series, the North 5400 full-face series, and the North 7600 full-face series. It is not compatible with 3M bayonet, Moldex bayonet, or any other brand's connection system.

Does the N75004L protect against dust or particulate?

No. The N75004L is a gas-only cartridge with no particulate filter media. When airborne dust, mist, or aerosols accompany the ammonia hazard — as is common in agricultural or refrigeration maintenance settings — the 7584P100L (ammonia/methylamine + P100) is the correct combination cartridge selection.

Does the N75004L protect against organic vapors or solvents?

No. The N75004L is rated for ammonia and methylamine only. Its adsorbent is specific to that chemical class and will not adsorb organic vapors such as toluene, xylene, or acetone. For organic vapor protection on a North bayonet respirator, use the N75001L or the 7581P100L.

How many cartridges come in the N75004L package?

The N75004L is sold as one pair — two cartridges — the standard quantity for a dual-cartridge half-face or full-face respirator. Confirm the current pack quantity on the listing before placing bulk orders.

What is the NIOSH approval class for the N75004L?

The N75004L is NIOSH-approved for ammonia and methylamine under 42 CFR Part 84. It is not rated for particulate (N/R/P-series), organic vapor (OV), acid gas (AG), or mercury vapor. The NIOSH approval class applies only to the chemical hazards for which it is tested and listed.

Can I use the N75004L in an agricultural ammonia environment?

Yes — agricultural facilities with confirmed ammonia vapor as the primary chemical hazard (poultry houses, hog confinement barns, anhydrous fertilizer handling) are a direct application for the N75004L on North bayonet respirators, provided concentrations are within OSHA-permitted cartridge use limits and the hazard assessment excludes other chemical co-hazards. If significant particulate is also present, use the 7584P100L combination cartridge instead.

Honeywell North N75004L Specifications

Helpful Buying Guides

• Honeywell North Cartridge Guide — Full Platform Overview
• Best Honeywell North Respirator Filters and Cartridges
• How to Choose a Respirator Cartridge
• Respirator Filter Types Explained
• Respirator Cartridge Color Chart — NIOSH Class Reference
• P100 vs N95 — What's the Difference?
• Organic Vapor vs P100 — Which Do You Need?

Honeywell North N75004L Frequently Asked Questions

What does the Honeywell North N75004L protect against?

The N75004L protects against ammonia (NH₃) and methylamine vapors only. It is a NIOSH-approved gas-only cartridge with no particulate filter media and provides no protection against organic vapors, acid gases, mercury vapor, or other chemical classes. Use it only when ammonia or methylamine has been identified as the sole airborne chemical hazard in a hazard assessment.

Does the N75004L fit 3M or Moldex respirators?

No. The N75004L uses the North bayonet connection, which is brand-specific. It will not seat on 3M bayonet respirators (6000, 6500, 7500, 7800S series), Moldex bayonet respirators, or any other manufacturer's facepiece. It is compatible only with Honeywell North 5500, 7700, 5400, and 7600 series respirators.

Is the N75004L a combination cartridge?

No. The N75004L is a gas-only cartridge rated for ammonia and methylamine. It contains no P100 or other particulate filter layer. When particulate hazards accompany the ammonia, the 7584P100L is the correct combination cartridge — it provides the same ammonia/methylamine gas protection with the addition of P100 particulate filtration.

Can the N75004L be used for refrigeration plant ammonia exposure?

Yes — for tasks with confirmed ammonia vapor as the documented chemical hazard and no significant particulate co-hazard, the N75004L is an appropriate single-gas cartridge selection for North bayonet respirator programs in refrigeration facilities. When dust or mechanical debris is also present, use the 7584P100L instead. All cartridge use must comply with OSHA 1910.134 requirements including hazard assessment and written respiratory protection program.

What is the difference between the N75004L and the 7584P100L?

Both cartridges protect against ammonia and methylamine on the North bayonet platform. The N75004L is a gas-only cartridge with no particulate filtration. The 7584P100L adds a P100 particulate filter layer, making it the correct choice when dust, mist, or aerosols accompany the ammonia hazard. In environments with confirmed vapor-only exposure, the N75004L costs less per pair for the same gas protection.

Does the N75004L protect against agricultural ammonia in poultry or hog facilities?

Yes — ammonia off-gassing in poultry houses and hog confinement facilities is within the N75004L's protection class for North bayonet respirator programs, provided concentrations are within OSHA cartridge-use limits and particulate from animal dander or litter is not a significant co-hazard. When both ammonia gas and particulate are present, the 7584P100L combination cartridge is the appropriate selection.

How often should I replace the N75004L?

Replace the N75004L upon breakthrough — when ammonia odor is detected through the cartridge — or according to your employer's scheduled change-out interval established under a written respiratory protection program per OSHA 1910.134. Ammonia cartridges do not have a built-in end-of-service-life indicator; a documented change-out schedule based on industrial hygiene data is required.

Does the N75004L work for methylamine as well as ammonia?

Yes. The N75004L is rated for both ammonia (NH₃) and methylamine by NIOSH. Methylamine is structurally similar to ammonia and is captured by the same adsorbent media used in this cartridge. This makes the N75004L appropriate for chemical manufacturing or laboratory settings where methylamine is a documented vapor hazard on a North bayonet respirator program.

Can I use the N75004L alongside a particulate prefilter?

Honeywell North prefilter pads such as the 7506N95, 7506N99, or 7506R95 are designed to attach in front of combination-style 75xx cartridges — not in front of gas-only N-Series cartridges. For ammonia + particulate protection in one sealed unit, use the 7584P100L, which integrates a P100 layer directly into the cartridge body.

What is the difference between the N75004L and the 75SCL Defender?

The N75004L is a single-class ammonia/methylamine cartridge suited for environments where NH₃ is the sole gas hazard. The 75SCL Defender is a multi-gas cartridge that covers organic vapor, acid gas, ammonia, methylamine, and additional classes in a single cartridge. Choose the N75004L for its lower cost when hazard assessment confirms ammonia only; choose the 75SCL when multiple distinct chemical classes are present in the same work area.

Is the N75004L approved for wastewater treatment plant use?

The N75004L is an appropriate ammonia cartridge for wastewater treatment tasks with confirmed ammonia vapor as the documented hazard in environments where cartridge-type respirator use is permitted (i.e., not IDLH, not oxygen-deficient). Digesters and sludge processing areas may involve hydrogen sulfide or other co-hazards — verify your specific task's hazard assessment before selecting a single-class cartridge over a multi-gas option like the 75SCL.

What is the N75004L price?

The N75004L is listed at $20.55 per pair through the Amazon affiliate link on this page (tag: wcsafety04-20). Price and availability are set by Amazon and may vary — confirm the current price on the listing before ordering.

WC Safety is an Amazon Associate. We may earn a commission on qualifying purchases at no additional cost to you. Pricing and availability are set by Amazon and may vary.