I have copies of the operating instructions and installation instructions for Duo-Therm gravity (no electricity or fan) furnaces. There is not a specific model number on the cover page, but inside they mention a number of models in the 65xxx series (when they talk about various features that certain ones have).

They specifically mention 65210, 65211, 6521R, 65212, 65311, 65411, 65510, 65512, and 65515.

The instructions are from 1975, and the furnace is one that was common in Trilliums of the era. Here is a photo of the grille from one:

Click to view attachment

Since I didn't see these in the Document Center here on FGRV, I have sent images of them to Donna, so that she could upload them to the Document Center for future reference and access for everyone. However, the Document Center is temporarily "out of order" and so she won't be able to upload them for a while. Since I know it's "furnace season," I would be willing to e-mail copies to someone who needs them right now :insert teeth chattering:

If you do need them immediately, just send me a PM. The operating instructions are 2 pages, as are the installation instructions. Each page is about 4 mb each as a .jpg image; or about 9 mb as a .pdf. (Since I don't have a scanner, I took high-res photographs of them.)

Or, if someone just has a question where I could look at the document and then answer, just go ahead and ask it here.

Raya

Raya, I just bought a duo therm electricity less, propane furnace yesterday. I could really use some installation instructions. If you don't mind forwarding them. It would be a big help. How is the best way to get you my email address? Daryl

Daryl, While you are waiting for the files from Raya, you might want to check out this link...
eHow How to troubleshoot a Duo Therm furnace.

Probably not as good as the actual manual but may help if your teeth are chattering.

Mike