Keep your furnace running smoothly with Filtrete's 14x14x1 AC Furnace Air Filter. Designed for easy installation and maximum performance, this filter fits a range of furnace sizes and removes up to 99.97% of airborne particles to keep your home clean and healthy. With its versatile application, this filter is perfect for anyone looking to maintain their furnace's efficiency and effectiveness. Get your hands on Filtrete's MPR 300 Clean Living Basic Dust filter pack today and enjoy cleaner, fresher air in your home.