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What I can tell you 100% from experience is that if you allow a fan designed to work with restriction, to pull more air than it should, the motor will overheat. The restriction on a DC should be on the inflow, not the outflow, so venting outdoors shouldn't hurt the motor.
Back on topic, I know 2 guys who vent outdoors. I've been in both their shops during the winter and couldn't feel a temperature change while the DC was running. The reason is that once everything (machines, floors, walls, etc.) in your shop is up to temperature, it will hold temperature even when some air is evacuated. It will be less energy efficient but not as bad as people theorize.
Back on topic, I know 2 guys who vent outdoors. I've been in both their shops during the winter and couldn't feel a temperature change while the DC was running. The reason is that once everything (machines, floors, walls, etc.) in your shop is up to temperature, it will hold temperature even when some air is evacuated. It will be less energy efficient but not as bad as people theorize.
