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First - welcome to the forum!
The vents are how your furnace gets return air. Make sure you keep the basement doors closed. The furnace should heat that area plus the underbelly to keep pipes and tanks from freezing. The vents can be sealed off if you are never in conditions that you need the furnace.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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