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Since we no not EVER use the furnace, I removed the return grills. Even so if it were to be used there is way more than enough return air from other places. You know these things are not built anywhere near air tight.
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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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