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What does the forward curve fan look like?
Are the blades of the fan coated or filled with dust?
As mentioned check your returns and supplies and maybe have a the ducting changed out. Flex is nasty stuff for resistance to flow when it is installed well. Yours is not installed well.
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Bill K.
"I started out with nothin and I still got most of it left...."
83 911 SC Guards Red (now gone)
And I sold a bunch of parts I hadn't installed yet.
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