We purchased a pre-20th Anniversary 2019 and it does have an arched ceiling. Starting last fall they changed design of the ductwork and installed a small block in the ductwork to prevent it from collapsing. I stuck my cell phone up through the return vent to verify. Our unit has good airflow and cools great. The flat roof may help even more, but I like the arch.
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2019 Montana 3121RL
2017 XLT 350 SCLB DRW 4X4
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