Remove the fan and hook it up to a 12v battery, I used a small battery charger. Run the fan a few minutes. Doing this I still couldn't stand the noise. I changed to two lower RPM fans, together they put out 10CFM more than the single noisy fan. Also built a shroud for the top vent for a smooth exit for the discharge air.
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Joe & Beverly
2014 Ram 2500 CTD, CC, SB
2014 8289WS lifted
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