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The Lennox Y1337 QuietR duct board is a genuine OEM 1.5" x 48" x 10-foot insulated duct board that provides excellent thermal efficiency and sound attenuation for residential and commercial HVAC duct systems. If you notice increased noise from your ductwork, temperature inconsistencies between rooms, or rising energy costs, deteriorating or improperly insulated ductwork may be the culprit. This Lennox OEM duct board is designed for use in fabricating or repairing supply and return air ducts and delivers reliable, long-lasting performance.