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Today's Hours 8am - 11pm estThe SQRD18X15 is a square‑to‑round adapter designed for use with compatible Trane packaged or split systems, converting a rectangular duct opening on the unit or curb to a round connection. This accessory allows the supply or return opening to connect easily to round metal or flexible ductwork, simplifying transitions between rectangular discharge/return configurations and round duct systems in the field.