Breathe clean air in your home and at work with ceiling fan air filters from Biostrike. The package includes 2 filters that attach on opposite blades of your ceiling fan. They remove airborne dust, pollen, allergens, animal hair and other contaminates that circulate in the air as the ceiling fan operates. Ceilng fan filters are specially treated to entrap allergens and other contaminates that ride along with dust and dirt to help keep your home healthier and safer. Package contains 2 filters to apply to one fan.