A healthy home begins with cleaner air. Improve the air quality in your house by reducing the amount of airborne allergens year round with a Filtrete(TM) 4-Season allergen filter combo pack. These electrostatically-charged air cleaning filter attracts and captures large airborne allergens like household dust and lint, keeping the air in your home clean and pure. They outperform fibreglass, washable and non electrostatic pleated filters. For maximum performance, replace your Filtrete(TM) filter seasonally (every 90 days) to ensure you and your household are breathing cleaner air. For residential use only, they are conveniently sold here in a pack of 4.