Breathe clean air in your home and at work with Ceiling Fan Air Filters. Ceiling fan air filters attach to the top of your fan's blades and help remove airborne dust, pollen, allergens, animal hair and other particles that circulate in the air as the ceiling fan operates. To use, simply remove the protective tape backing and attach to opposite blades of your ceiling fan. Place them on the top side of the blades, about 3-5 inches from the motor. This will help ensure that the filters won't affect the fan's balance. As the fan rotates, the filters help remove airborne dust, pollen, allergens, pet dander and other contaminants, resulting in a healthier environment. These ceiling fan air filters are specially designed for smooth air flow. Each filter is effective for up to three months, depending on the environment. Great for use on 3, 4 or 5 blade ceiling fans.