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Is the square inches of the fireplace opening less than ten times the flue outlet?

April 26, 2017fireplace flue inches opening outlet square times

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Is the square inches of the fireplace opening less than ten times the flue outlet?

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I haven’t measured the flue outlet on the roof yet, but I doubt it. The fireplace opening is 28″ H X 30″W X 19″ Deep. I believe the tile at the top of the flue is approx. 12″X8″. conclusion: Flue may not be large enough for fireplace. 28 x 30 = 840. The inside size of a 8 x 12 is 7 x 11. 7 x 11 = 77. 77 x 10 = 770 (the largest fireplace should be). If opening lowered to 25.5 it should work. 25.5 x 30 = 765. Look at smoke guard on my site at: http://www.FireLogs.com/HyC.htm.