Secure, online ordering, and to-your-door-delivery - it's a snap to order Honeywell-compatible pre filter # 190909
NOTE: Some of Honeywell's F52D series models use a different size - # 198442, measuring 19-1/2 x 26-3/8 x 1/4. MEASURE YOUR EXISTING PRE-FILTER FIRST!!
Approximately 11-1/4x23x1/4