Standard replacement filter for the Alen A250, A350, and A375UV. All-on-one pre-filter/HEPA filter/activated carbon filter combination unit.
Part number BF25A.
- Over time, the HEPA-Fresh Filter becomes overloaded with particles, decreasing its filtration performance. Regular filter replacements, at least every 6 months, are recommended with normal use.
- Rinse or lightly vacuum the removable black Alen Pre-Filter as soon as it develops a layer of visible particles. Allow it to completely dry before replacing.
Washing or vacuuming the white HEPA style material will damage the fibers and is not recommended.