The GeneralAire 12749 is the correct replacement for the following air cleaner:
The GeneralAire 12749 Media Frame Assembly is a complete media frame assembly that fits the GeneralAire AC3 Air Cleaner model. Also known as part number 4005, this GeneralAire air cleaner media frame assembly kit comes with all of the components needed to help your AC3 Air Cleaner operate with high efficiency air filtration for a cleaner environment.
GeneralAire Complete Media Frame Assembly specifications:
For optimum performance of your GeneralAire Whole House Air Cleaner, replace your filter and other vital components as required, based on usage and air quality. GeneralAire is also known by the following spelling variations: GeneralAir, General Aire and General Air.