WHT ARE SEAT CUSHION FILTERS & SEAT BACK FILTERS? WHERE ARE THEY LOCATED? on 2005 Cadillac DeVille

I noticed in the maint. schedule references to the above filters. No problem so far.

Asked by for the 2005 Cadillac DeVille
Some DeVille's have heated and cooled seats. Since air is blowing through the seat, there are filters that are there that need replaced.
WHEREARE THEY LOCATED
I'm sorry; the technical information I have does not show the location. I would recommend just having a local shop have a quick look - I'm sure they'd do it for you.