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Message: <blockquote data-quote="duece212" data-source="post: 6346413" data-attributes="member: 558948">I covered the cab vents in my truck and it didn't really make a huge difference in shutting the doors, it did make a big difference when using the heater/ac though.  The truck would pressurize enough to mess with your ears.  I always had to crack a window whenever the heater/ac was on.Cover it and see if it makes a difference, doubt it will make much difference to how loud you perceive your system to be.  If it doesn't make a big difference open it back up, its not worth the hassle of having to crack a window or put your vent on recirculate if its closed off.</blockquote>

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