The BOFA pre-filter works as a barrier, to contain the larger particulate, protecting the main filters from blocking. Compatible with the following: * Bofa AD Oracle * Bofa AD Oracle iQ * Bofa AD Base 1 Oraclelas * Bofa AD Base 2 Oracle https://elecena.pl/product/29668854/bofa-ad-oracle-replacement-pre-filter 2026-01-05 https://elecena.pl/product/29668854/bofa-ad-oracle-replacement-pre-filter 2026-03-12