DuraVent PelletVent Pro 3" x 12" Galvalume Pipe Extension watt1600 000 BTU HR (LP) 1200W WM6 NG DMI G9T F5P NB 000 BTU HR (LP) depending on the size and 18” pipe adds 3” 16” of length when used with rigid sections of pipe For installations that require a 4″ vent and the appliance has a 3″ outlet
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