24x36x1 Aerostar Air Filter

At 23 3/4" x 35 3/4" x 3/4" actual, the 24x36x1 Aerostar fits a nominal 24x36x1 return. This is a larger residential or small commercial size, common on furnaces serving big homes and on some commercial rooftop units that use a 1-inch slot rather than deeper media. Three MERV grades cover the typical filtration range. MERV 8 for baseline dust and pollen filtration. MERV 11 for pet households and mild allergy concerns. MERV 13 for fine particulate capture including smoke, bacteria, and virus-sized droplets. Pleated synthetic media construction with an electrostatic charge handles the work. The pleats give you substantially more surface area than a flat fiberglass filter at the same nominal size, which extends the service life to 60 to 90 days under typical residential conditions. The electrostatic charge improves capture in the sub-micron range where the physical weave alone reaches its limits. Manufactured by Con-Air Industries in Orlando, Florida. Cardboard frame, reinforced for shape retention under blower suction. MERV 13 in this depth wants a 30-to-60-day change interval - higher filtration grades reach their pressure-drop limit faster as captured debris builds up across the filter face. For larger homes running long blower cycles, the shorter change interval matters more than for compact systems with shorter run times.