Discussion Starter · #1 ·
Hello! I was wondering if anyone knows if I can put a filter in the return even if there is no holder? I have two units (upstairs/downstairs). They both have filters by the blowers but I've noticed the returns (2 upstairs/1 downstairs) are caked. Do I need to buy a holder or can I just put one in and rest it? Is it okay to do that?