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Today's Hours 8am - 11pm estThe Sterling 5-Inch Vertical Combustion Air Inlet Kit is designed for compatible XF Series 100-250 unit heaters, providing a reliable solution for outside combustion air intake. Its vertical configuration offers installation flexibility while helping maintain proper airflow for dependable heater operation. Designed specifically for Sterling XF Series applications, this kit is a practical choice for completing a properly configured combustion air system.