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Old 2018-09-12, 7:06pm
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Speedslug Speedslug is offline
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Join Date: Mar 21, 2009
Location: Winnebago, MN
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You might want to replace the flex duct with smooth walled ducting. Either metal or PVC.

The turbulence that flex ducting has inside can reduce the CFMs down to half or even a third of what a smooth wall ducting would provide.

It effectively reduces an eight inch duct diameter down to to three inches.
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