Important details of an electric motor:
Power, in either amps or hp, (I'm assuming that the supply voltage is 12VDC)
Shaft diameter and length (important if you plan to use the existing fan blade.
Speed (RPM)
With that information, look at this link:
https://www.amazon.com/12v-dc-motor/s?k=12v+dc+motor
Or call your local electronics shop. They will point you in the right direction. Where in Alberta are you? If you're in Calgary, this place may be of interest to you:
https://www.solarbotics.com/
I’m a man of many options.
You might also try rebuilding the motor that you have. It looks like it is meant to be serviced. New bearings and brushes and it will be as good as new, ish. I can't read the whole brand name, but if it is Pittman, they are still makeing motors:
https://pdf.directindustry.com/pdf/a...70-133515.html
They may also sell parts for that motor, or that motor.
Yet another option:
Put a heat powered fan on your
furnace. I have this one:
https://www.princessauto.com/en/twin...t/PA0008901241