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The DURAVENT 6DT-CS11 11" Square Ceiling Support Box features a one-inch wall design for easy installation, such as through 16" on-center rafters. Lightweight insulation and twist-lock fittings ensure ease of installation. DuraTech support boxes feature factory-installed twist-lock fittings and support up to 60' of DuraTech chimney.
DuraTech support boxes feature factory installed twist-lock fittings. Thermal Tech blanket insulation keeps the outer wall of the chimney cool.
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