Furnace filter sizes
Read the size printed on your current filter's frame (for example 16x25x1), then pick it below.
16x25x1actual 15.5 x 24.5 x 0.75 in20x25x1actual 19.5 x 24.5 x 0.75 in16x20x1actual 15.5 x 19.5 x 0.75 in20x20x1actual 19.5 x 19.5 x 0.75 in14x20x1actual 13.5 x 19.5 x 0.75 in14x25x1actual 13.5 x 24.5 x 0.75 in12x24x1actual 11.5 x 23.5 x 0.75 in20x30x1actual 19.63 x 29.63 x 0.75 in24x24x1actual 23.38 x 23.38 x 0.75 in16x24x1actual 15.38 x 23.38 x 0.75 in25x25x1actual 24.5 x 24.5 x 0.75 in18x24x1actual 17.38 x 23.38 x 0.75 in16x25x4actual 15.5 x 24.5 x 3.63 in20x25x4actual 19.5 x 24.5 x 3.63 in16x25x2actual 15.5 x 24.5 x 1.75 in20x25x2actual 19.5 x 24.5 x 1.75 in
About MERV
MERV (Minimum Efficiency Reporting Value) reports a filter's ability to capture particles between 0.3 and 10 microns; higher MERV traps more of specific particle sizes. EPA: if upgrading, choose at least MERV 13 or as high as your system fan and filter slot can accommodate; you may need an HVAC technician to confirm.
Sources
Data checked 2026-10-17. Always confirm the part number printed on your current filter or in your owner's manual.