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Old 02-11-2010, 04:24 PM   #1
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HVAC reducing the CFM


I'm trying to find a way to reduce the CFM in my stove range-hood to pass code for a wood fireplace. They will not accept the LOW SPEED ONLY and I've been told that elbows a length reduce the CFM. Any idea of where to look for a formula?

thanks,
doug

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