Furnace Manual

[momjess82]

Hello. I have a Coleman 7680B856 furnace in my mobile home. We have been renting for a year and will begin buying within the next few months hopefully. I forgot all about furnace filters last year but, remembered now. Winter is starting to set in and I went to look at the filter so that I could purchase a replacement. There is no furnace filter in either furnace door and I do not have a manual. Can anyone help me out with this?