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The GeneralAire 4001 is the correct replacement filter for the following air cleaner models:
The GeneralAire 12758 MERV 11 Filter Media Replacement is a replacement air filter for the GeneralAire AC1 and AC22 model air cleaners. This replacement filter media features a MERV 11 rating and Micro Fiber construction for the reduction of airborne particles and contaminants. A higher MERV rating results in higher air filtration and improves the indoor air quality of your home.
The GeneralAire MERV 11 filter features an accordion-style construction and expands to fit inside the filter frame assembly. Also known by product number 4001, this air cleaner filter media is very durable and built to last.
GeneralAire 12758 MERV 11 Filter Media Replacement specifications: