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High-performance ThermoFlo Ducting is one of the most reliable options for exhausting warm, humid air from the indoor garden. High-performance ThermoFlo Ducting is one of the most reliable options for exhausting warm, humid air from the indoor garden. Featuring several layers of reinforced metal laminate casing, a smooth double-sealed interior and galvanized steel coils, this six-inch ducting is air-tight, puncture-resistant, and easy to install. Heavy-duty ThermoFlo ducting also assists in keeping noise to a minimum. Available in 25-foot lengths.