Superior 6-inch Section Double Wall Pipe - Galvanized P58-66 inch Section Superior Double Wall Pipe Galvanized P58 6 Product Details Elevate your fireplace with the Superior 32 inch Brushed Brass Fixed Door, FD32B. Enhance the aesthetic appeal of your living space with its elegant brushed brass finish. Features: 5 Inch Direct Vent Double Wall Pipe For use with Superior or Superior Direct Vent Fireplaces Only Available in a variety of sizes This unit requires a venting pipe with an inner diameter of 5 Inches.