Filtrete Advanced Allergen Reduction Filter, 16 in. x 20 in. x 1 in., 4/Pack. Keeping your home clean and healthy is your mission and Filtrete Healthy Living filters can be your perfect partner.  Featuring high performing electrostatic technology, Filtrete filters proactively capture dust, bacteria, germs, viruses and allergens in your air.  For optimum performance, change your filter every 90 days or sooner.