{"product_id":"honeywell-north-7504r95-prefilter-2-pack","title":"Honeywell North 7504R95 Prefilter 2 Pack","description":"\u003caside style=\"border: 2px solid #ff9800; padding: 20px 24px; background: #2a2520; margin: 24px 0; border-radius: 6px; color: #f5e6d3;\"\u003e\n  \u003cdiv style=\"display: flex; align-items: center; gap: 12px; margin-bottom: 12px; flex-wrap: wrap;\"\u003e\n    \u003cspan style=\"background: #ff9800; color: #1a1a1a; font-weight: bold; padding: 4px 12px; border-radius: 4px; font-size: 0.95em;\"\u003eEDITORIAL REVIEW: 4.4\/5\u003c\/span\u003e\n    \u003cspan style=\"color: #ffb74d; font-size: 0.9em;\"\u003eIndependently reviewed by WC Safety\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cp style=\"margin: 0 0 14px 0; color: #f5e6d3; font-style: italic; line-height: 1.5;\"\u003e\"R95 oil-resistant prefilter for the North cartridge holder system — same performance as 7506R95 in holder format\"\u003c\/p\u003e\n  \u003cp style=\"margin: 0;\"\u003e\n    \u003ca href=\"\/blogs\/product-reviews\/honeywell-north-7504r95-review\" style=\"color: #ff9800; font-weight: bold; text-decoration: none;\"\u003eRead the full review →\u003c\/a\u003e\n     ·\n    \u003ca href=\"\/blogs\/guides\/best-honeywell-north-respirator-cartridge\" style=\"color: #ffb74d; text-decoration: none;\"\u003e2026 North cartridge buyer's guide →\u003c\/a\u003e\n  \u003c\/p\u003e\n\u003c\/aside\u003e\n\n\u003ch2\u003eHoneywell North 7504R95 — R95 Oil-Resistant Prefilter, North Cartridge Holder System, 2-Pack\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell North 7504R95\u003c\/strong\u003e is a \u003cstrong\u003eNIOSH 42 CFR 84 R95 oil-resistant prefilter\u003c\/strong\u003e designed for the \u003cstrong\u003eHoneywell North cartridge holder system\u003c\/strong\u003e — providing \u003cstrong\u003e95% oil-resistant particle filtration\u003c\/strong\u003e in a prefilter format compatible with the North 550030 and related holder-equipped respirators, sold as a 2-pack. The 7504R95 provides the same R95 oil-resistant protection as the snap-on \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e but in the holder format designed for the 5500 series facepiece cartridge holder system. For the snap-on format that fits N-series cartridges directly, see the \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e. For dry environments without oil, the \u003ca href=\"\/products\/honeywell-north-7506n95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506N95 (N95)\u003c\/a\u003e is the non-oil-resistant equivalent.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#1a1a1a;border-left:4px solid #ff9800;border-radius:4px;padding:16px 20px;margin:24px 0;\"\u003e\n\u003cstrong style=\"color:#ff9800;\"\u003eQuick Facts — 7504R95\u003c\/strong\u003e\n\u003cul style=\"margin-top:8px;padding-left:18px;line-height:1.9;color:#e0e0e0;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e Honeywell North 7504R95\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e R95 Oil-Resistant Prefilter — North cartridge holder format, 2-pack\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNIOSH Approval:\u003c\/strong\u003e 42 CFR 84 R95 — 95% filtration efficiency, oil-resistant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 2 prefilters per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e North cartridge holder system — not a snap-on prefilter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSnap-on equivalent:\u003c\/strong\u003e \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e (snaps onto N-series cartridges)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPF:\u003c\/strong\u003e Determined by facepiece — APF 10 (half-mask), APF 50 (full-face)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul style=\"line-height:2;padding-left:18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eR95 oil-resistant protection in holder format:\u003c\/strong\u003e Same 95% oil-resistant particle filtration as the 7506R95 snap-on prefilter — designed for the North cartridge holder system used on North 550030 and similar facepieces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold as a 2-pack:\u003c\/strong\u003e Two prefilters per package for both holder positions on a North facepiece equipped with the cartridge holder system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil aerosol coverage:\u003c\/strong\u003e R-class filter media maintains ≥95% efficiency in oil mist environments for up to 8 hours per NIOSH testing — required when cutting fluids, coolant mist, or other oil aerosols are present\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHolder system format:\u003c\/strong\u003e Compatible with the specific holder geometry of North cartridge-holder-equipped respirators — confirm compatibility with your facepiece model\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications — When to Use the 7504R95\u003c\/h2\u003e\n\u003cp\u003eThe 7504R95 is used in the same oil mist environments as the 7506R95, in facilities using the North cartridge holder format:\u003c\/p\u003e\n\u003cul style=\"line-height:1.9;padding-left:18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetalworking with cutting fluid mist:\u003c\/strong\u003e CNC machining, grinding, and turning with water-soluble or oil-based coolants alongside gas cartridge requirements — holder-system facepieces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial oil mist environments:\u003c\/strong\u003e Hydraulic oil aerosol, lubricant mist, and other petroleum-based aerosols in workplaces also requiring gas protection from the cartridge holder system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5500 series respirator users:\u003c\/strong\u003e Workers using North 550030 series facepieces with the cartridge holder system in oil mist applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\u003ch2\u003eCompatible Respirators\u003c\/h2\u003e\n\u003cp\u003eThe 7504R95 is designed for the \u003cstrong\u003eHoneywell North cartridge holder system\u003c\/strong\u003e — confirm compatibility with your specific facepiece model. For the snap-on prefilter format that fits all North bayonet gas cartridges, see the \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e.\n\n\n\u003c\/p\u003e\u003ch2\u003eNorth Cartridge \u0026amp; Filter Line — Full Comparison\u003c\/h2\u003e\n\u003cp\u003eThese prefilters snap onto North gas cartridges to add particle filtration. For integrated gas+particle protection, see the combination cartridges below.\u003c\/p\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;background:#1a1a1a;color:#e0e0e0;margin:16px 0;font-size:0.93em;\"\u003e\n\u003cthead\u003e\u003ctr style=\"background:#2a2a2a;\"\u003e\n\u003cth style=\"padding:10px 12px;border:1px solid #333;color:#ffb74d;text-align:left;\"\u003eModel\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;border:1px solid #333;color:#ffb74d;text-align:left;\"\u003eProtection Class\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;border:1px solid #333;color:#ffb74d;text-align:left;\"\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background:#2a2a2a;\"\u003e\u003ctd colspan=\"3\" style=\"padding:7px 12px;border:1px solid #333;color:#ffb74d;font-weight:700;font-size:0.88em;\"\u003eSNAP-ON PREFILTERS (for N-series gas cartridges)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7506n95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506N95\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eN95 — 95%\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eSnap-on for gas cartridges — economical particle upgrade, dry environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eR95 — 95% oil-resistant\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eSnap-on for gas cartridges — oil mist, metalworking\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7506n99-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506N99\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eN99 — 99%\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eSnap-on for gas cartridges — fine silica, pharmaceutical dust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7504r95-prefilter-2-pack\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7504R95\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eR95 — 95% oil-resistant\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eNorth cartridge holder system — oil mist environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2a2a;\"\u003e\u003ctd colspan=\"3\" style=\"padding:7px 12px;border:1px solid #333;color:#ffb74d;font-weight:700;font-size:0.88em;\"\u003eP100 PARTICULATE FILTERS (standalone)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7580p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7580P100\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eP100 — 99.97%\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eParticulate only — silica, lead, asbestos (2-pack)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-75ffp100-p100-respirator-filter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75FFP100\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eP100 — 99.97%\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eSame as 7580P100 — single unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2a2a;\"\u003e\u003ctd colspan=\"3\" style=\"padding:7px 12px;border:1px solid #333;color:#ffb74d;font-weight:700;font-size:0.88em;\"\u003eCOMBINATION CARTRIDGES (GAS + P100 — preferred over prefilter+gas cartridge)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7581p100l-organic-vapor-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7581P100L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + P100\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eSpray painting, solvents with particles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7583p100l-organic-vapor-acid-gas-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7583P100L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + AG + P100\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eMixed chemical environments\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-7584p100l-ammonia-methylamine-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7584P100L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eNH₃\/MA + P100\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eWastewater, agriculture, refrigeration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-75scp100l-multi-contaminant-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75SCP100L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + AG + NH₃ + P100\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eMulti-hazard — broadest combination cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-75852p100l-mercury-vapor-chlorine-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75852P100L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eMercury + Cl + P100\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOnly North Hg cartridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#2a2a2a;\"\u003e\u003ctd colspan=\"3\" style=\"padding:7px 12px;border:1px solid #333;color:#ffb74d;font-weight:700;font-size:0.88em;\"\u003eGAS-ONLY CARTRIDGES (snap prefilters attach to these)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-n75001l-organic-vapor-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75001L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV only\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eAdd 7506N95\/R95\/N99 for particle upgrade\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-n75002l-acid-gas-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75002L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + AG\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eAdd prefilter for particle co-exposure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-n75003l-organic-vapor-acid-gas-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75003L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + AG + NH₃\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eTriple gas — add prefilter for particles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#222;\"\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-n75004l-ammonia-methylamine-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75004L\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + NH₃\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + ammonia — add prefilter for particles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;font-weight:600;\"\u003e\u003ca href=\"\/products\/honeywell-north-75scl-defender-multi-gas-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75SCL\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + AG + NH₃\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eDefender series — add prefilter for particles\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eBrowse the complete lineup at \u003ca href=\"\/collections\/honeywell-north-respirator-cartridges\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eHoneywell North Respirator Cartridges \u0026amp; Filters →\u003c\/a\u003e\u003c\/p\u003e\n\n\n\u003ch2\u003eOSHA Compliance\u003c\/h2\u003e\n\u003cul style=\"line-height:1.9;padding-left:18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eNIOSH approval required:\u003c\/strong\u003e All filters and cartridges in OSHA-mandated programs must be NIOSH approved under 42 CFR Part 84\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHazard assessment required:\u003c\/strong\u003e OSHA 1910.134(d)(1) — filter\/cartridge type must match the documented workplace hazard class\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFit testing required:\u003c\/strong\u003e OSHA 1910.134(f)(2) — annual fit testing for any tight-fitting facepiece before operational use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter replacement schedule:\u003c\/strong\u003e P-class and N\/R-class filters are replaced when breathing resistance increases or visible contamination occurs — not on a fixed time schedule\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMedical evaluation prerequisite:\u003c\/strong\u003e OSHA 1910.134(e) — required before fit testing and before operational respirator use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3 style=\"margin-bottom:6px;\"\u003eWhat is the difference between 7504R95 and 7506R95?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eBoth are NIOSH R95 oil-resistant prefilters with identical protection. The difference is attachment format: the \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e snaps directly onto North N-series gas cartridges; the 7504R95 is designed for the North cartridge holder system used on certain North facepiece models. Confirm which format your respirator uses before ordering.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eWhat is the North cartridge holder system?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eSome Honeywell North respirators (including the 550030 series) use a cartridge holder that mounts gas cartridges to the facepiece — with a separate prefilter slot. The 7504R95 fits into this holder system. If your respirator does not use a holder system, use the snap-on \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e instead.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eDo I need oil-resistant R95 instead of N95 for cutting fluid?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eYes — cutting fluids (both oil-based and water-soluble emulsions that contain oil) produce aerosols that degrade N-class filter media. R95 or P-class filters are required for oil mist. The 7504R95 R95 is the correct choice for metalworking with coolant.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eIs fit testing required?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eYes — OSHA 1910.134(f)(2). Annual fit testing for the facepiece before operational use. The prefilter format does not change the fit test requirement.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eHow often should I replace the 7504R95?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eReplace when breathing resistance increases noticeably, the prefilter is visibly loaded, or after 8 hours of use in oil environments per NIOSH R-class criteria. Establish a written replacement schedule per OSHA 1910.134(d)(3)(iii).\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eWhere can I find all North cartridges and filters?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eBrowse the complete lineup at \u003ca href=\"\/collections\/honeywell-north-respirator-cartridges\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eHoneywell North Respirator Cartridges \u0026amp; Filters →\u003c\/a\u003e\u003c\/p\u003e","brand":"Honeywell North","offers":[{"title":"Default Title","offer_id":42510289502296,"sku":"Honeywell North 7504R95","price":20.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/download_b880a1ec-d3dc-4027-ab5d-e6e5c3d7d1f1.jpg?v=1734807287","url":"https:\/\/wcsafety.com\/products\/honeywell-north-7504r95-prefilter-2-pack","provider":"WC Safety","version":"1.0","type":"link"}