Quick view Compare Choose Options Dupont 20x25x4.38 ProAllergen MERV 12 Honeywell Replacement Air Filters $40.31 As Low as $30.23 per Filter! Dupont ProAllergen Replacement Air Filters for 20x25x4.38 Honeywell® F25 Model 203720. ACTUAL SIZE: 19-7/8 x 24-3/4 x 4-3/8 | NOMINAL SIZE: 20x25x5. Filtration rating: MERV 12...