I have a cover over my vent that allows me to keep the inner cover open and run the fan even in the rain and while running down the road. Most people say it's best to shut the vent when rolling because cross winds can rip them off. With the bigger cover you can leave the vent open and not worry about rain coming in.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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