A search here shows occasional questions about the goofy assortment of filters available for these things, so I thought this might help: the original info sheets from Thomas.
Hey Duncan, thanks for all these manuals. Nice job scanning them and really useful. I just notice your from Grayslake, IL. I use to work there and lived in Antioch. Moved across the border years ago but still visit friends in Lake County.
Hey, glad to help! Whenever I get my hands on a useful but usually-missing manual for something, I can't help but turn it into a PDF for everyone else who might someday need it. And I try to make sure it's of high enough quality and put together right that it can just be duplex-printed back into a perfect hardcopy if needed.