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nosticks, the restriction is a non-problem. I have dealt with airflow issues and filters all my working life, so on this one little subject I know it isn't a problem.
As far as slow air, that's exactly what you want in heat mode. You want a slow airflow with heat. As long as the air is pulled back into the return air, it will be fine.
Dick, you are co-rect! I always power wash any fan I pull to change the motor all the little curved blades are always full or covered with lint and crud, even with filters. An RV furnace will have hair, lint and junk on the blades.
Trust me on this one folks.
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