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Fun with numbers (venting)

According to the numbers, leg one of my main has 1.1 cubic feet of capacity and leg two has 1.3 cubic feet of capacity.

I have two Hoffman 75's on the end of each leg, giving a venting capability of 1.000 cfm @ 1 ounce of pressure for each leg.

According to the numbers, my mains should vent in just a tad over one minute. But, it takes almost exactly 4 minutes from when the header is hot until the antlers get hot and the vents close. Once the header is hot, my gauge flutters between one tenth and two tenths of a pound.

Why don't the numbers work?




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