✓ Actual Size: 19 5/8" x 24 1/8" x 4 7/8" ✓ Fits GeneralAire 20x25x5 Openings ✓ Compatible with GeneralAire 5FM2025 / 6FM2025
MERV 11 Performance Data
Performance Data: This MERV 11 filter has an initial resistance of 0.08 in (w.g.) and has a nominal face velocity (FPM) of 295. Air Flow rate(CFM) 1024.
✓ USA-made compatible replacement for GeneralAire 5FM2025 / 6FM2025
✓ Actual size: 19⅝" × 24⅛" × 4⅞" — fits the MAC 2000 media opening
✓ MERV 11 — captures pollen, dust, pet dander, mold spores & smog
✓ 2-pack — roughly 6 months of filtration per filter
🔼 Want higher filtration? Step up to the GeneralAire 5FM2025 MERV 13 upgrade — same fit, captures finer smoke and bacteria-sized particles.
⚠️ Verify your size: this is the 20x25x5 filter for MAC 2000-class cabinets — not the 16x25x5 (MAC 1400) or 20x20x5 (MAC 2020). Check your cabinet model before ordering.
Fits these GeneralAire / General Filters cabinets
MAC 2000 (Mega-MAC), MAC 3000, MAC-L, and Perfect Platform air cleaners.
Replaces these part numbers
GeneralAire 5FM2025, 6FM2025, 4501, 4551, 14201, and GA100A37. GeneralAire replaced the older MERV 10 5FM2025 / 4501 with the MERV 11 6FM2025 / 4551 — this filter matches the current MERV 11 spec.
Also fits
Because it's the same 4⅞" deep media, this filter also fits Trion Air Bear (259112 / 266649), Skuttle DB-25-20 (448-006), and Ultravation 91-006 cabinets. It is not a replacement for shallow Lennox or Honeywell 20x25x5 filters, which are 4⅜" deep — check your depth if you're unsure.
Install with the airflow arrow pointing toward the furnace or air handler. Made in the USA, and priced well below OEM.
