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I cannot run the exhaust in winter as
it pulls the heat out faster than the furnace can produce it.
That is the main problem. My gas furnace hung from the ceiling and if I crack the door & window open, turn on the fans, the temperature drops too quickly.
I could build a sheet plastic booth to control the ventilation better but heating would still be an issue as the furnace would be outside the booth.
The thought of explosive gases building up in the shop also has me thinking it's best to move the car.