More than likely, the furnace is located under the steps going to the upper level. Looking at YouTube videos of your model, the furnace air return is located on the bottom step (that wooden grate) over the face of the bottom step. This is the air return for the furnace.
To access the furnace, you'll need to remove the back wall of the front pass-through (basement). Several screws are holding that board on.
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2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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