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Any chance you can trace the duct back to the heater? Much more efficient to damper the duct where it leaves the plenum and you won't get all the whistling at the grill.
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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