The return vent grills in most all the homes here in The Villages do not need or are designed for a separate filter. The filter cabinet in your garage is more than enough. You can install either a Merv 8 or Merv 11 filter. The most common size is a nominal 19x20x4. Adding more risks restriction of the airflow and can damage your unit.
This is assuming that you have a Carrier heat pump system.
Hope this helps....
Frank D.
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Florida licensed Home Inspector #HI688. (352) 250-7818
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