203372 | REPLACEMENT PREFILTER FOR ELECTRONIC AIR CLEANERS. 20 X 25 AND 20 X 12.5. WORKS WITH F50A,E. PRICED INDIVIDUALLY. MUST BE ORDERED IN MULTIPLES OF 2. Pack of 2 | Resideo

12.5X20 PREFILTER, 1PC Resideo NCO-203372 Pre-FilterThe Resideo NCO-203372 is a 12.5" x 20" pre-filter designed to remove large particles from the air before they can reach the HVAC system. This helps protect the system from damage and improves its efficiency. The pre-filter is made of a durable material that can be easily cleaned or replaced. It is also available in a variety of sizes to fit different HVAC systems.Our HVAC supply store offers the best prices and fast shipping for your products!