12" X 20" X 1" Lifetime Permanent Washable Filter

Permatron 3856-1220LRG | Our#: 178218

1 Year Purchase Guarantee - Free returns for a year, up to $1000 of purchase protection.


12" X 20" X 1" Low-Resistance, Electrostatic Permanent Washable Filter

(actual size - 11-1/2" X 19-1/2" X 7/8")

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

12" X 20" X 1" Lifetime Permanent Washable Filter
12" X 20" X 1" Lifetime Permanent Washable Filter Reviewed by 3
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Displaying reviews 1-3:

By Richard h.


 5 of 5

Filter ordering service


Your company and product lived up to your advertising. This is a rare occurence in these days of the internet. I'll be passing the word among friends and family. Thanks.

BOTTOM LINE: Yes, I recommend this product

By Joan M.


 4 of 5

Tired of box store filters


Time will tell if these filters can be washed repeatedly and remain effective but the concept is wonderful for those of us who are tired of cheaply made but expensive store bought filters.

BOTTOM LINE: Yes, I recommend this product

By Jonathan F.


 5 of 5

Permanent Air Filter


Everything from ordering, delivery, product quality and installation went very well. I haven't washed it yet but so far it seems to be filtering a lot of dust. I'm so happy I don't need to buy replacement filters anymore :-)

BOTTOM LINE: Yes, I recommend this product

Product Documentation