Thomas, The pattern and the floor are merely after-thoughts concerning the density. If it takes 6 pounds of fuel to vaporize 1 gallon of water, 15 gallons of water would control 90 pounds of fuel. If the fuel burning rate is 90 pounds per minute, you need 15 gallons per minute. If the head covers 150 sq. ft., the density is .1 gpm/sq. ft.
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