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My total length is 27' of 5" duct work in my basement. I would like to reduce 15' of it to 4". This will eliminate 3 elbows and make it a straight run. This will only supply my basement and I am wondering if this can be done? Their are waterlines near the duct work and this is why I am using 4 inches. Would appreciate any advice from you professionals? Thank you for your time.:thumbsup:
 

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You'll probably get 80% less air flow due to the small size. How well does that area heat now.
 
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