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I was told by our dealer's service manager that each bend or turn in the hose reduces the airspeed. I don't know if he knows what he is talking about but shortening and straightening the duct might help. It seems to me whatever volume starts through the duct would exit the duct but I'm not an expert on these things. Maybe the bends create backpressure and actually do reduce the volume getting all the way through.
If you try this, please let us know the results.
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