Is it possible to sidewall vent an 80% draft induced furnace without an auxillary power venter?
Yes.
Your local building codes specify a minimum non-powered vent size required for different capacity furnaces. Call your local code compliance group and check with them.
I installed a new 125,000 BTU gas fired, 80% eff. furnace several years ago in an older home, and had to install an 8" diameter vent thru the wall into the room in which the furnace was located. This was required by the local municipal building code. Actually, I didn't have an outside wall on the room the furnace was in so I had to run a duct into the room fron the outside wall. Some codes make you provide a duct that will discharge a minimum distance from the furnace.
The vent was of sufficient size to allow sufficient flow of combustion air to the furnace burner without a power assist.
The vent opening had to be screened on the outside
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