Aprilaire 501 Filter for Aprilaire 5000 - 2 Pack

From AirFilters.com

Genuine Aprilaire 501 Filter for Aprilaire 5000 Now days, people constantly worry about their weight. They worry about their waist or hips growing in size. Well, one thing you can count on to stay the same size is your air filter. You can also rely on this filter to trap unwanted airborne particles from indoor air. The accordion style design of this filter is specially formulated to maximize the dust-holding capacity. This means it can capture contaminants longer and more effectively. However it is extremely important to replace your filter regularly to maintain high efficiency.