I have a Carrier 31KAX016110 electronic air filter...about 10 years old. I can't for the life of me figure out what kind of filters are necessary. I hear there is a pre and post filter...but I've never seen either of these. The only filter I have installed is a blue plastic type 'wool' filter that doesn't look like it would filter out anything!
Anyone point me to the correct filter(s) and, perhaps, where I can get these? Available at places like WalMart?