{"product_id":"honeywell-north-7506n99-respirator-prefilter","title":"Honeywell North 7506N99 Respirator Prefilter","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: 4.3\/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\"N99 efficiency upgrade for gas cartridge users — 4× less particle penetration than N95 for fine powders\"\u003c\/p\u003e\n  \u003cp style=\"margin: 0;\"\u003e\n    \u003ca href=\"\/blogs\/product-reviews\/honeywell-north-7506n99-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 7506N99 — N99 Snap-On Prefilter for North Gas Cartridges, NIOSH 42 CFR 84\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eHoneywell North 7506N99\u003c\/strong\u003e is a \u003cstrong\u003eNIOSH 42 CFR 84 N99 snap-on prefilter\u003c\/strong\u003e that attaches to North N-series and 75SCL gas cartridges — providing \u003cstrong\u003e99% particle filtration efficiency\u003c\/strong\u003e, a higher-efficiency upgrade over the N95-class \u003ca href=\"\/products\/honeywell-north-7506n95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506N95\u003c\/a\u003e. The 7506N99 is appropriate when N95 efficiency is insufficient for the particle hazard — particularly fine respirable dust (pharmaceutical API, fine crystalline silica, fine metal dust) in dry environments without oil aerosol. For oil mist environments, use the oil-resistant \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95 (R95)\u003c\/a\u003e — the 7506N99 is not rated for oil aerosols. For the highest particle efficiency (99.97%) integrated with gas protection, combination cartridges such as the \u003ca href=\"\/products\/honeywell-north-75scp100l-multi-contaminant-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75SCP100L\u003c\/a\u003e provide P100 in a single unit.\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 — 7506N99\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 7506N99\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e N99 Snap-On Prefilter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNIOSH Approval:\u003c\/strong\u003e 42 CFR 84 N99 — 99% filtration efficiency\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOil Resistance:\u003c\/strong\u003e N (not oil-resistant) — dry environments only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. N95:\u003c\/strong\u003e N99 allows 5× less particle penetration than N95 (1% vs. 5%)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003evs. P100:\u003c\/strong\u003e P100 (99.97%) allows ~3× less penetration than N99 (0.03% vs. 1%)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAttachment:\u003c\/strong\u003e Snaps onto North N-series gas 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\u003eNIOSH N99 — 99% non-oil particle efficiency:\u003c\/strong\u003e Higher filtration grade than N95 — N99 reduces particle penetration to 1% vs. N95's 5%, a 5× improvement in particle penetration. Appropriate when N95 efficiency is inadequate for the documented hazard concentration or particle size distribution\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSnap-on upgrade for gas cartridge users:\u003c\/strong\u003e Same attachment as 7506N95 — snaps directly onto N-series gas cartridges without removing them from the facepiece, upgrading particle protection to N99 level\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot oil-resistant:\u003c\/strong\u003e N99 filter media is not rated for oil aerosols — oil exposure degrades efficiency. Use \u003ca href=\"\/products\/honeywell-north-7506r95-respirator-prefilter\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e7506R95\u003c\/a\u003e for oil mist environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNiche efficiency tier:\u003c\/strong\u003e N99 sits between N95 and P100 — it is rarely specified as a regulatory minimum and is most useful when N95 is borderline for documented exposure levels and P100 is considered overkill by IH assessment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eApplications — When to Use the 7506N99\u003c\/h2\u003e\n\u003cp\u003eThe 7506N99 is appropriate when N95 efficiency is insufficient for documented fine particle hazards in dry gas-cartridge environments:\u003c\/p\u003e\n\u003cul style=\"line-height:1.9;padding-left:18px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eFine pharmaceutical API dust:\u003c\/strong\u003e Active pharmaceutical ingredient manufacturing with very fine respirable particles in solvent-vapor environments — N99 provides more protection margin than N95 for fine aerosol size distributions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFine respirable crystalline silica:\u003c\/strong\u003e Operations with high-concentration fine silica (quartz, cristobalite) in dry environments where IH assessment determines N95 provides insufficient protection margin below the APF 10 ceiling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFine metal dusts with gas co-exposure:\u003c\/strong\u003e Cobalt, beryllium, or other high-toxicity fine metal dusts in operations also requiring gas cartridge protection — confirmed non-oil environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\u003ch2\u003eCompatible Gas Cartridges (Snap-On)\u003c\/h2\u003e\n\u003cp\u003eThe 7506-series prefilters snap directly onto Honeywell North \u003cstrong\u003eN-series and 75SCL gas-only cartridges\u003c\/strong\u003e already installed on the respirator facepiece. They do not attach directly to P100 combination cartridges (7581P100L, 7583P100L, etc.) — those already contain integrated P100 filtration.\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;\"\u003eGas Cartridge\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;border:1px solid #333;color:#ffb74d;text-align:left;\"\u003eGas Coverage\u003c\/th\u003e\n\u003cth style=\"padding:10px 12px;border:1px solid #333;color:#ffb74d;text-align:left;\"\u003eResult with Prefilter\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\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\u003c\/td\u003e\n\u003ctd style=\"padding:9px 12px;border:1px solid #333;\"\u003eOV + particle filtration\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;\"\u003eOV + AG + particle filtration\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;\"\u003eOV + AG + NH₃ + particle filtration\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 + NH₃ + particle filtration\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;\"\u003eOV + AG + NH₃ + particle filtration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\n\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 7506N99 and 7506N95?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eBoth are non-oil-resistant NIOSH prefilters. N95 = 95% efficiency (5% penetration). N99 = 99% efficiency (1% penetration) — 5× less penetration than N95. Use 7506N99 when N95 efficiency is insufficient for the documented particle hazard at the confirmed exposure concentration.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eWhy would I use N99 instead of P100?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eP100 (99.97%) provides higher efficiency than N99 (99%) in a combination cartridge format. However, if you already have gas cartridges in service and need only a particle efficiency upgrade over N95, the 7506N99 snap-on avoids replacing the gas cartridges prematurely. For new cartridge selection, combination cartridges with integrated P100 (e.g., \u003ca href=\"\/products\/honeywell-north-75scp100l-multi-contaminant-p100-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75SCP100L\u003c\/a\u003e) are typically preferred over N99 prefilters.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eWhich cartridges does the 7506N99 snap onto?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003e\u003ca href=\"\/products\/honeywell-north-n75001l-organic-vapor-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75001L\u003c\/a\u003e, \u003ca href=\"\/products\/honeywell-north-n75002l-acid-gas-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75002L\u003c\/a\u003e, \u003ca href=\"\/products\/honeywell-north-n75003l-organic-vapor-acid-gas-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75003L\u003c\/a\u003e, \u003ca href=\"\/products\/honeywell-north-n75004l-ammonia-methylamine-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eN75004L\u003c\/a\u003e, and \u003ca href=\"\/products\/honeywell-north-75scl-defender-multi-gas-respirator-cartridge\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e75SCL\u003c\/a\u003e. Not for P100 combination cartridges.\u003c\/p\u003e\n\n\u003ch3 style=\"margin-bottom:6px;\"\u003eCan the 7506N99 be used for asbestos?\u003c\/h3\u003e\n\u003cp style=\"margin-top:0;\"\u003eYes — N99 meets and exceeds the N95 minimum for asbestos Class III and IV work. For Class I and II, full-face with P100 (APF 50) is required — use a P100 combination cartridge on a \u003ca href=\"\/products\/honeywell-north-54001-full-face-respirator-mask\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003eNorth 54001\u003c\/a\u003e or \u003ca href=\"\/products\/honeywell-north-760008a-medium-large-full-face-respirator-mask\" style=\"color:#4fc3f7;text-decoration:underline;\"\u003e760008A\u003c\/a\u003e.\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.\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":42510330855512,"sku":"7506N99","price":22.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/download_999e6c9d-9c62-428c-a2ef-17ee99829755.jpg?v=1734810797","url":"https:\/\/wcsafety.com\/products\/honeywell-north-7506n99-respirator-prefilter","provider":"WC Safety","version":"1.0","type":"link"}