There really IS some difference....fan speed changes Hi to LO and on LO 'slight' change in airflow
LO fan can cause icing on Evap Coil due to lower airflow and does little to actually move enough cool air to maintain temps thruout RV
Only Hi Speed Airflow ratings are published.....320 CFM
Nothing about Lo Speed Airflow or motor rpm
I always use HI for MAX cooling/airflow
When I replaced the old analog T-stat with a Digital one I didn't bother wiring up LO Speed
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I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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