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Old 08-03-2013, 06:55 PM   #49
51 MERC-CT
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Default Re: Shewman's High Flow Thermostats

The 12% sounds good but if you calculate the area of the openings you will find it to be more in the 25% range not counting the severe restriction on the brass one, then it looks more like 35-40% if not more.
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