DuraVent PolyPro Concentric 4" x 6" x 39" Vent Length h33.125 What’s the difference between the

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DuraVent PolyPro Concentric 4" x 6" x 39" Vent Length h33.125 What’s the difference between thePolyPro Concentric provides users the most versatile polypropylene venting system for high efficiency, condensing appliances. The injection molded modular system is designed with a powder coated aluminum outer pipe and a polypropylene inner pipe. It does not require a locking band and provides users with a fast, safe, clean, and sustainable venting solution. The PolyPro Concentric system also includes elbows that have a smooth wall lining and are