The AprilAire 810 Replacement Filter for 2025FG MERV 11 20x25x4 is manufactured at AprilAire’s Madison, Wisconsin facility. Pleated MERV-rated media (11 or 13) for whole-house air purifier replacement, or water panel evaporative media for AprilAire steam/bypass humidifier — sized to OEM specs for direct fit.
Compatible with AprilAire whole-house air purifiers (Models 1210, 2210, 2410, 3210, 4400, etc.) and bypass humidifiers (Models 110, 220, 500, 550). Recommended annual replacement frequency. Backed by AprilAire’s product warranty.
AprilAire manufactures whole-house air quality products in Madison, Wisconsin since 1954. Replacement filters, humidifier panels, and whole-home air purifier components — the American whole-house IAQ standard supported by HVAC contractors nationwide.
