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My 2- 6 volt and 2- 12 volt batteries have not been covered/vented at all for 6+ years. Never an issue. The front compartments are FAR from air tight. IMHO they get enough natural venting without the need for a sealed box.
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2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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