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I have an old ('76) Duo-Therm furnace model 65512-002, and would like to upgrade it with a blower. It was an option from Duo-Therm (original part number 9-3548), but I haven't been able to find one yet. Could anyone help me?
Or would it be easier (and cheaper) to replace the whole furnace (even though it does work reasonably well for me)?