Not Ranked
Dave, the fresh air knob on my SPF only pulls out about 1/2" (maybe 3/4"), and air comes in thru the opening on the outside/underside of the footbox (need to be around 40MPH or higher) - not from the heater blower vent. Maybe the hose has an obstruction, or maybe the valve/flap is not opening fully. Mine slides open/close pretty easily/smoothly.
Hope this helps,
Randy...
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