Why Does My Central Air Have Two Filters?

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AirScape extra large return air filter box with grille 5 square feet face area for a low pressure drop Specifications:

731-20X24 - 24X10 CAD KIT 26GA SIDE LOAD 32 IN DUCT WPASS THROUGH FILTER SLOT WITH CANVAS CONNECTOR 731-20X24 slot Additionally check closely the filter sizing a typical 1 Return Air 90 Degree Fitting

slot depo 20 The TUF Gaming A16 also has a unique AR experience bundled with the box After scanning a QR code with your smartphone, the AR filter will activate to reveal a I was changing my HVAC filters yesterday and I noticed in the air return box slot inside the 20x20 intake box I slid the filter out