The air filters FiltersDelivered.com offers aren`t simply any type of filter, they are AC & Furnace filters designed to offer reliable great performance and be functional with a wide range of HVAC systems. Our air filters are put through rigorous quality assurance testing to ensure that their resistance, performance, efficiency and particle holding capability are all exceeding the average. These furnace filters are constructed with heavy-duty beverage-board frames using two-piece frame construction to ensure that they last longer and guarantee stability to their owners.