Approximately 9-1/2" x 10-1/2" x 1-1/2"
Fits Aprilaire Models:
110, 220, 500, 500A, 500M, 550, 550A, and 558
Subs for Aprilaire filter # 10
Fits Honeywell Enviracaire Models:
HE225A, HE225B, HE220A, HE220B
Subs for HC22A1007 and HC22E1003
Fits Trane Models:
THUMD200ABM00AA, THUMD200ABM00BA
Subs for Trane filter # BAYPAD01A1010A
Fits Lennox Models:
WB2-12 and WB212
Subs for Lennox filter # X2660
Fits American Standard Models:
AHUMD200ABM00A
Fits Armstrong / Air-Ease: AHB12A
Other Stock Numbers: UAPRILAIRE10P, DH1008
Recommended Replacement: Once each season; more often in hard water areas.