18" X 18" X 1" Lifetime Permanent Washable Filter

Permatron 3856-1818LRG | Our#: 178208
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18" X 18" X 1" Low-Resistance, Electrostatic Permanent Washable Filter

  • 18x18x1" Nominal
  • 17½x17½x⅞" Actual
  • Washable
$39.99 $51.99
In Stock
Ships Tomorrow, Apr. 18th
3 stars (1 review)

18" X 18" X 1" Low-Resistance, Electrostatic Permanent Washable Filter

(actual size - 17-1/2" X 17-1/2" X 3/4")

Never buy another filter!  Our permanent washable filter is designed to provide great value and last a lifetime.   This durable filter is constructed with a combination of woven polypropylene media supported by heavy-duty steel mesh in a galvanized steel frame. The filter carries a lifetime warranty and is ideal for heat pumps, sensitive 90+ efficient furnaces and systems with limited air flow.  This is the best and last filter you will ever buy.


  • Designed to minimize initial resistance to airflow
  • Reduces the number of pollutants and allergens in recirculated air and keeps your HVAC system clean
  • Uses natural static electricity to attract and capture airborne particles
  • Washable - cleans up in minutes
  • Includes anti-microbial polymeric protection
  • Durable steel frame
  • Dirt won't get caught in the filter during washing - due to specially-designed drainage ports in the filter frame
  • Lifetime warranty

Clean Monthly by rinsing your filter with running water.  For tough dirt and/or grease, use a mild detergent (i.e., 409 or Simple Green) and rinse thoroughly with warm water.

Average arrestance efficiency - 74%
Initial resistance - 0.07" w.g.
Dust holding capacity - 110 grams



by PowerReviews
Permatron18" X 18" X 1" Lifetime Permanent Washable Filter

(based on 1 review)

Reviewed by 1 customer

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Performance is all my concern

By Duraid

from Jacksonville, Florida

About Me Renter

Verified Buyer


  • Good Fit
  • Good Value


    Best Uses

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    Comments about Permatron 18" X 18" X 1" Lifetime Permanent Washable Filter:

    I wish the metal frame was built in a stronger construction since it's a permanent usage

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