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20x24x1 Filter - Multi-Pleat XL8™ manufactured by Koch Filter*Made in the USA! *High Dust Holding Capacity *Pleated 20x24x1 Furnace Filters available in Standard or High Capacity ratings for lower resistance to airflow. (More info on our MERV 8 Pleated Filters by Koch Filter) SOLD AS A CASE OF 12 FILTERS