Honeywell North 7506N95 Respirator Prefilter

Honeywell North 7506N95 — N95 Snap-On Prefilter for North Gas Cartridges, NIOSH 42 CFR 84

The Honeywell North 7506N95 is a NIOSH 42 CFR 84 N95 snap-on prefilter that attaches directly to Honeywell North N-series and 75SCL gas-only cartridges — converting them to gas + particle combination protection without replacing the cartridge. The 7506N95 provides 95% particle filtration efficiency against non-oil-based aerosols (N95 class). It is the economical particle upgrade choice when the underlying gas cartridge (N75001L, N75002L, etc.) still has usable sorbent life and only a particle filter needs to be added. For oil mist environments, use the oil-resistant 7506R95 (R95) instead. For higher efficiency with fine dust, see the 7506N99 (N99). For fully integrated gas + P100 protection in a single cartridge, combination cartridges such as the 7581P100L are typically more convenient.

Key Features

• NIOSH N95 — 95% efficiency for non-oil particles: N95 class covers silica, asbestos, lead, mold, biological aerosols, and other non-oil-based particulates — the minimum OSHA-specified filter class for most regulated particulate hazards
• Snap-on convenience: Attaches to North N-series gas cartridges without removing the cartridge from the facepiece — adds particle protection mid-task when particulate co-exposure is encountered
• Economical particle upgrade: More cost-effective than replacing gas cartridges mid-service-life — extends the value of gas sorbent while adding required particle protection
• Not oil-resistant: N95 filter media is not rated for oil aerosols — if oil mist (cutting fluids, coolant, lubricants) is present, use 7506R95 (R95)

Applications — When to Use the 7506N95

The 7506N95 is appropriate when N-series gas cartridges are in use and non-oil particle protection is needed:

• Silica dust in solvent environments: Construction or manufacturing operations where both organic vapors (from coatings or adhesives) and silica dust are present — add 7506N95 to an N75001L OV cartridge for combined protection
• Agricultural dust with gas co-exposure: Grain dust or organic agricultural dust in environments also requiring gas cartridge protection (NH₃, OV)
• Pharmaceutical dust with gas co-exposure: API dust from dry powder operations alongside solvent vapor in confirmed oil-free environments
• Intermittent particle tasks: Gas cartridge users who periodically encounter non-oil dust during tasks that are primarily vapor-only

When to use a combination cartridge instead: If particles are routinely present alongside gas hazards, an integrated combination cartridge (7581P100L, 7583P100L, 75SCP100L) provides more convenient and consistent protection than a snap-on prefilter, and includes P100 efficiency (99.97% vs. N95's 95%).

Compatible Gas Cartridges (Snap-On)

The 7506-series prefilters snap directly onto Honeywell North N-series and 75SCL gas-only cartridges already installed on the respirator facepiece. They do not attach directly to P100 combination cartridges (7581P100L, 7583P100L, etc.) — those already contain integrated P100 filtration.

North Cartridge & Filter Line — Full Comparison

These prefilters snap onto North gas cartridges to add particle filtration. For integrated gas+particle protection, see the combination cartridges below.

Browse the complete lineup at Honeywell North Respirator Cartridges & Filters →

OSHA Compliance

• NIOSH approval required: All filters and cartridges in OSHA-mandated programs must be NIOSH approved under 42 CFR Part 84
• Hazard assessment required: OSHA 1910.134(d)(1) — filter/cartridge type must match the documented workplace hazard class
• Fit testing required: OSHA 1910.134(f)(2) — annual fit testing for any tight-fitting facepiece before operational use
• Filter replacement schedule: P-class and N/R-class filters are replaced when breathing resistance increases or visible contamination occurs — not on a fixed time schedule
• Medical evaluation prerequisite: OSHA 1910.134(e) — required before fit testing and before operational respirator use

Frequently Asked Questions

What does the 7506N95 protect against?

Non-oil-based particles at 95% efficiency (N95 class): silica, asbestos, lead, mold, biological aerosols, and non-oil dust. It adds particle protection to whatever gas cartridge it is snapped onto. It does not protect against oil-based aerosols — use 7506R95 for oil mist.

Which cartridges does the 7506N95 snap onto?

North N-series gas cartridges: N75001L, N75002L, N75003L, N75004L, and 75SCL. It does not snap onto P100 combination cartridges (7581P100L, 7583P100L, etc.) — those already contain integrated P100 filtration.

Is N95 sufficient for OSHA silica requirements?

N95 meets the NIOSH filter minimum for OSHA silica standards (29 CFR 1910.1053 / 1926.1153) when used with a half-mask at APF 10. For exposures exceeding 10× the silica action level (0.025 mg/m³) or where full-face is required, a P100 filter or combination cartridge with P100 provides more protection margin. Confirm the correct protection level with your industrial hygiene assessment.

When should I use 7506N99 instead of 7506N95?

Use the 7506N99 (99% efficiency) when exposure involves very fine particles — pharmaceutical API dust, high-concentration silica, or environments where the extra efficiency margin over N95 is warranted by air monitoring data. N99 provides ~20× less penetration than N95.

Can the 7506N95 be used for asbestos?

Yes — N95 meets the NIOSH minimum for OSHA asbestos 1910.1001 Class III and IV work (half-mask APF 10). For Class I and II asbestos (full-face required), use a P100 filter on a North 54001 or 760008A full-face respirator for APF 50.

Is fit testing required?

Yes — OSHA 1910.134(f)(2). Annual fit testing is required for the facepiece before operational use. Adding a prefilter does not change the fit test requirement.

How do I know when to replace the 7506N95?

Replace when breathing resistance increases noticeably, the prefilter is visibly loaded or damaged, or per your written replacement schedule. Prefilters do not have a chemical end-of-service-life — replacement is based on physical loading.

Where can I find all North cartridges and filters?

Browse the complete lineup at Honeywell North Respirator Cartridges & Filters →