GeneralAire 12758 | Our#: 198927

GeneralAire AC-1 Replacement Air Filters

34 review(s)
Average rating 4.8/5
5 stars
4 stars
3 stars
2 stars
1 star

GeneralAire 12758 | Our#: 198927

  •  Fast Shipping & Free Returns
  •  100% Compatibility Guarantee

Reduce common allergy symptoms

  • Reduces allergy irritating particles
  • Captures allergens like dust, mold spores, pet dander, dust mite debris and more
  • Lessens odors from car fumes & smog
  • Creates cleaner indoor air

2 people in your area recently purchased this product!

  •  Fast Shipping & Free Returns
  •  100% Compatibility Guarantee
Frequently Purchased Together

Product Details

The GeneralAire #12758 replacement filter fits air cleaner models AC1 and AC22. The filter traps and removes airborne pollutants and allergens. Accordion-style media expands and fits into reuseable plastic frame. Existing pleat spacers are used to hold the filter in the frame. When replaced every six months, the filter provides clean and healthy indoor air.


  • MERV 11
  • Removes dust, pollen, mold, pet dander and odors
  • Accordion style filter media expands to fit into the plastic frame
  • Use existing pleat spacers for an evenly spaced and efficient surface area
  • Replace every 6 months
  • Fits: GeneralAir AC1 and AC22 whole house air cleaners 
  • Fits: Bryant 902BX; Carrier 31MF020, 31MF120
  • Fits: Source 1 S1-MAC11202506, S1-FM11202506
  • Replaces GeneralAire Part # 12758 / GFI # 4001
  • 19-5/8" x 25" x 6" nominal size
  • 19-5/8" x 24-3/8" x 4-3/4" actual size

Replaces These Filters:

GFI # 4001

Fits In These Systems:


How to change your furnace/air-conditioner/HVAC air filter

Estimated time: 10 minutes or less


  1. Determine the location of your filter

    Your forced air system will be similar, whether or not it is a heating (furnace) or cooling (AC) system – or both. The furnace filter housing/slot is located right next to the heating/cooling system’s air handler or blower. Your filter(s) may also be located in a return grille on the wall or ceiling of your home.

  2. Determine the type/size of filter that you use

    Typically, the dimensions or part number of the filter will be printed on the filter frame. Use this information to order a new filter.

  3. Purchase a new air filter from

    Visit and purchase a new filter. Use our filter finders to verify the correct match.

  4. Remove the old filter

    Turn off the power to the heating/cooling system and remove the old filter from its housing/slot and discard.

  5. Insert the new filter

    Pay attention to any airflow direction arrows printed on the frame of the new filter. Install the filter by sliding it into the filter housing/slot with the airflow arrow pointing towards the blower. If installing the filter in a wall or ceiling grille – the airflow arrow should point towards the wall or ceiling. Turn on the power to the forced air system.

    Enjoy cleaner air!