Filters Fast Logo Header
Free Shipping on orders over $99 | FREE 365-DAY RETURNS

Product Availability

Please provide your e-mail address below to receive a notification when this product becomes available:


Thanks! We'll send you a notification when this product is available!


Filters Fast® FF4M8-20254, 20x25x4 MERV8 Replacement for GeneralAire FP2025 3-Pack


Only $20.32 per Filter
Retail: $70.99 /ea
You Save: 14%
As low as
Retail: $70.99
You Save: 14%
Ships in 1 to 2 business days.
Home Filter Club

Sign up for the Home Filter Club in checkout. You choose how often you want your filter, and we take care of the rest. Home Filter Club
Purchasing for a Business?

Contact [email protected] to gain access to case quantity discounts, account management and terms! Home Business Services

The Filters Fast® FF4M8-20254, 20x25x4 MERV8 is the compatible replacement for the GeneralAire FP2025 and 4526. This set of Filters Fast® MERV 8 filters effectively reduces contaminants from your indoor air. Removing these airborne particles can help improve allergies and alleviate sinus irritation that can cause watery eyes, itchy throat, coughing, and sneezing. Electrostatically charged and constructed with spun micro-fiber that will not retain moisture, these Filters Fast® HVAC filters will also extend the life of your heating and cooling system by making it work more efficiently.

Filters Fast® 20x25x4 MERV8 Specifications:

  • Part Number: FF4M8-20254
  • Replaces Part Number: 4526 and FP2025
  • Pack Size: 3 Filters
  • MERV Rating: 8
  • Filter Type: Electrostatic pleated
  • Material: Synthetic
  • Replace every 3 months
  • For commercial and residential use

Dimensions of the Filters Fast® 20x25x4:

Nominal Size Actual Size

  • 20x25x4 Air Filter 19-1/2 x 24-1/2 x 3-1/2

NOTE: If you don't see your size, order a custom made air filter! Custom made air filters do not come individually wrapped. Please be advised that some larger filters require an additional cost (see dropdown window above).

Compatible Models:

The Filters Fast® FF4M8-20254, 20x25x4 MERV8 Replacement for GeneralAire FP2025 3-Pack is correct replacement for the following model numbers:

  • GeneralAir TERSus 2000 Air Purification Systems
  • GeneralAire 5FM2025
  • GeneralAire MAC2000
  • Trion 255649-102