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I did as you suggested Charlie. The ducts are sealed.
I did notice, however, that the furnace ducts out the bottom of the unit, versus the sides or front as I am used to seeing. When the front cover goes back on, all the air has to pass thru a 3/8" gap on the side of the heat tube in order to reach the bottom duct. The fan doubled rpm when I replaced the cover.
With the cover off, I got plenty of heat.
Design flaw?
I am considering installing an extension on the furnace cover to give the air a way down.
Ideas?
Thanks,
Jim
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