DuraVent DuraTech 20" Diameter Chimney Wall Strap - 20DT-WSDuraVent DuraTech 20" Diameter Chimney Wall Strap 20DT WS Review You desire a long lasting, energy efficient venting system for your house fireplace. Flame Authority, your trusted dealer, carries the DuraVent DuraTech 20" Diameter Chimney Wall Strap 20DT WS. *Venting Requirements: This unit requires venting pipe with an inner diameter of 18 Inches. Please see the Venting Components section on this page if available for venting pipe that must be used
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