Aprilaire Pleated Filter Media, For Use With: High Efficiency Air Cleaner, 13 MERV, 1200 cfm, 27.83 Sq ft, 20 Inch H Expanded x 25 Inch L, Polypropylene Acrylic, 4 Inch W
- This filter media needs changed twice per year if you have heating and air conditioning and once per year if you have just heating
- Should you have special conditions like lots of shedding pets, are located near a farm or other dusty environment or are a commercial application you will need to replace the filter media more often
