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inches Area of Various Standard Round Flues Diameter (ins.) Area (sq. ins.) 5” 20 sq. inches 6” 29 sq. inches 7" 39 sq. inches 8" 51 sq. inches INSTALLING HEATER BASE ASSEMBLY A WARNING: You must secure this heater to fireplace floor. If not, heater will move when you adjust controls. Moving heater may cause a gas leak. A WARNING: If installing in a sunken fireplace, special care is needed. You must raise the fireplace floor to allow access to heater control panel. This will insure a