Check the dimensions printed on the side of the old filter (e.g., 20x25x1 inches). Also, note the MERV rating or filter material, as different systems may require specific types for optimal performance and protection.
Step 4 · Identify Filter Size and Type
Check the dimensions printed on the side of the old filter (e.g., 20x25x1 inches). Also, note the MERV rating or filter material, as different systems may require specific types for optimal performance and protection.
