First Stage FIBER-TRAPPER Particulate Pre-filter: F1821-12

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The F1821 “FiberTrap” filter is the OEM replacement 1st stage, 1" throwaway MERV 4 pre-filter for Abatement Technologies, Inc.’s model PAS2400 portable air scrubber. The actual size of the F1821 air filter is approximately 18 x 24 x 1.

The FiberTrap pre-filter is designed to capture the coarsest particles circulating through your air duct system which helps to extend the life of the 2nd stage carbon-pleated filter and the HEPA filter, saving you money!

Manufacturer recommended replacement schedule for the F1821 pre-filter:

  • High Particulate - every 8 hours
  • Medium Particulate - every 48 hours
  • Low particulate - every 72 hours or until filter light goes on

For instructions on how to change your air cleaner filter, please refer to your units Instruction Manual.

The Abatement Technologies F1821 pre-filter is UL 900 Class 2 listed.

This package ships with 12 filters.


  • Filter Type: Pre-Filter Pad
  • Efficiency Rating: Not Rated
  • Frame Type: None
  • Media Type: Natural Fiber
  • Gasket Type: None
  • UL900 Flammability: Yes

Additional Details:

  • Std Pkg Uom: CS
  • Std Pkg Qty: 12
  • Price Unit: PR
  • Package: 12PR/CS
  • 1 in. pre-filter.
  • Only compatible with PAS2400