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Shop NACA duct
Ductwork - BB7020 Black Plastic Single Naca Duct 10 1/2"L x 6"H For 3" Duct Hose
$29.95
Amazon.com
Keyser Manufacturing 100 49004: Keyser Manufacturing NACA Ducts
$22.99
Summit Racing
NACA Duct, Dual Hose - Black | Pegasus Auto Racing Supplies
$34.99
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NACA duct
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A NACA duct, also sometimes called a NACA scoop or NACA inlet, is a common form of low-drag air inlet design, originally developed by the U.S. National Advisory Committee for Aeronautics, the precursor to NASA, in 1945.
Wikipedia