• Close up of AMS A4501 KN95 Particulate Respirator Filter showing For Use in USA label and trapezoidal shape
  • 5-Ply Filter Structure Diagram of AMS A4501 featuring Dual Melt-blown and Hot Air Cotton layers for maximum dust holding
  • Front view of AMS A420D Professional Reusable Respirator Mask compatible with A4501 replacement filters
  • Step-by-step guide on how to replace and insert A4501 filter into AMS A420D mask retainer
  • Worker using angle grinder with sparks flying while wearing AMS A420D respirator with A4501 filter for industrial protection
  • Recommended industrial applications for AMS A4501 filters including metalworking shop, chemical plant, welding area, and woodworking
  • User guide instructions for AMS A420D respirator: installing filter, adjusting straps, and performing negative pressure seal check

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AMS A4501 KN95 Replacement Filters for A420D Respirator – 5-Ply Protection (10-Pack)

AMS A4501 KN95 Replacement Filters for A420D Respirator – 5-Ply Protection (10-Pack)

$15.00
$15.00
SAVE Sold out

Official AMS Replacement Part | Compatible with A420D Only

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Close up of AMS A4501 KN95 Particulate Respirator Filter showing For Use in USA label and trapezoidal shape

AMS A4501 KN95 Replacement Filters for A420D Respirator – 5-Ply Protection (10-Pack)

$15.00
$15.00
SAVE Sold out

Upgrade your breathing protection with the advanced A4501 filter system. Designed exclusively for the AMS A420D Respirator.

🛡️ Medical-Grade Standard: KN95 certified (≥95% filtration efficiency against non-oil particles).

🧬 5-Ply Tech: Features Dual Melt-blown layers for maximum filtration and Hot Air Cotton for superior breathability.

🏭 Extended Wear: High dust-holding capacity ideal for woodworking, welding, and grinding.

📦 Box Contains: 10 x Individually sealed filter pads.

⚠️ COMPATIBILITY NOTICE: This filter pack is designed strictly for the AMS A420D Respirator. It does NOT fit AMS A620, A680, or A820 models. Please check your mask model before purchasing. (The mask frame is sold separately).

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How long does shipping take?

For U.S residents, shipping takes 4-5
business days. For international orders, it takes 7-14 business days. We provide tracking for all orders. You can also visit our Track Your Order page for the latest updates.

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What is the return policy & fit guarantee?

We stand behind our gear. If the mask doesn't fit perfectly or meet your expectations, you can return it within 30 days in unused condition for a full refund or exchange. We also offer a 1-year warranty against manufacturing defects

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Need technical help or filter advice?

Not sure which filter is right for your chemicals? Our safety specialists are ready to assist. Contact us via the chat widget or email support@amsarmor.com. We respond to all technical inquiries within 24 hours.

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Designed Exclusively for the AMS A420D System

Don't compromise your seal with generic filters. The A4501 fits perfectly into the A420D’s retainer, ensuring a 100% airtight seal for negative pressure checks.

Why Choose AMS A4501?

  • AMS A420D Respirator Kit Exploded View showing Cold Flow Exhalation Valve and Filter Assembly

    Advanced Airflow Technology

    Unlike standard 3-layer filters, our unique Hot Air Cotton layer creates a 3D depth filter. It traps dust without clogging the surface, keeping breathing resistance low (<210 Pa) even during heavy labor.

  • 5-Ply Filter Structure Diagram of AMS A4501 featuring Dual Melt-blown and Hot Air Cotton layers for maximum dust holding

    The 5-Ply Defense Shield

    We use Dual Melt-blown layers. Layer 2 captures coarse particles, while the electrostatically charged Layer 4 traps sub-micron particles (<0.3 microns), ensuring consistent ≥95% efficiency.

  • Step-by-step guide on how to replace and insert A4501 filter into AMS A420D mask retainer

    Smart Protection

    Stop throwing away expensive disposable masks. Simply replace the A4501 cotton filter and keep your durable A420D silicone mask. Save money while reducing waste.
    5-Ply Filter Structure Diagram of AMS A4501 featuring Dual Melt-blown and Hot Air Cotton layers for maximum dust holding

    Inside the Protection: 5 Layers of Defense

    Outer Non-woven: Blocks large debris and sparks.

    Melt-blown Layer 1: Initial fine dust filtration.

    Hot Air Cotton: The "Game Changer." Adds thickness for dust capacity and thermal insulation against moisture.

    Electrostatic Melt-blown Layer 2: Traps microscopic particles via electrostatic attraction.

    Soft Inner Layer: Skin-friendly fabric for all-day comfort.

    User guide instructions for AMS A420D respirator: installing filter, adjusting straps, and performing negative pressure seal check

    Designed for AMS A420D Series

    This filter is the "lung" of your AMS A420D respirator system.

    Perfect Fit: Sits securely inside the filter box cover.

    Correct Installation: Ensure the printed text side faces inward (towards your face) and the plain white side faces outward.

    Compatibility: Works with AMS models A420D.

    Why AMS is the Smart Choice

    Stop overpaying for replacement filters. Get a complete month's supply in one box.

      Others
    10 Filters (1-Month Supply)
    Food-Grade Silicone
    Hypoallergenic (No Rash)
    Cold-Flow Valve System

    Technical Specifications

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    Product Specs

    Model: AMS A4501

    Standard: GB2626-2019 KN95.

    Filtration Efficiency: ≥ 95% (NaCl medium).

    Material: Non-woven PP, Melt-blown fabric, Hot Air Cotton.

    Shelf Life: 3 Years (in original sealed packaging)

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    Maintenance & Safety

    Do Not Wash: Water destroys the electrostatic charge, reducing efficiency to ~60%.

    When to Change: Replace when breathing becomes difficult, the filter is damaged, or you detect odors.

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    Recommended Applications

    Woodworking: Sawdust, sanding dust.

    Metalworking: Grinding, cutting, welding fumes (ozone-free).

    Construction: Cement dust, drywall, silica dust.

    General Industry: Factory dust, non-oil based aerosols.