✓ Actual Size: 19 5/8" x 24 1/8" x 4 7/8" ✓ Fits GeneralAire 20x25x5 Openings ✓ Compatible with GeneralAire 5FM2025 / 6FM2025
MERV 13 Performance Data
Performance Data: This MERV 13 filter has an initial resistance of [0.10] in (w.g.) and a nominal face velocity (FPM) of 295. Air Flow rate (CFM) 1024.
✓ USA-made MERV 13 upgrade compatible for GeneralAire 5FM2025 / 6FM2025
✓ Actual size: 19⅝" × 24⅛" × 4⅞" — fits the MAC 2000 media opening
✓ MERV 13 — captures everything MERV 11 does plus bacteria, smoke & fine 0.3–1.0 micron particles
✓ 2-pack — roughly 6 months of filtration per filter
💧 Prefer the standard rating? The GeneralAire 5FM2025 MERV 11 version covers dust, pollen, and pet dander at a lower price — same 4⅞″ fit.
⚠️ 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. This is the MERV 13 upgrade over the standard MERV 10/11 GeneralAire media — same fit, higher filtration.
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.
MERV 13 keeps airflow healthy at 5-inch depth — the deep pleats spread air across so much media that the higher rating adds very little resistance. Install with the airflow arrow pointing toward the furnace or air handler. Made in the USA, and priced well below OEM.
