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Do not remove ground prong from plug. Route power cord to avoid heat from the stove, or other damage. 3. Adjust the blower speed control to the desired speed. BLOWER SWITCH ADJUSTMENTS The blower speed control for this unit is adjusted at the factory, and should not require further adjustment. When the speed control is turned clockwise, it will click on to high speed. Turn the speed control clockwise to decrease the speed. At full clockwise, the blower should blow gently, but should not stop.