Venting

4'' Oval 6" Length - 4" Diameter - Ridge Pipe B-Vent Gas Vent Chimney, Duravent.   Oval Gas Vent Instructions Chimney Venting Sizing Handbook

4'' Oval 6" Length - 4" Diameter - B-Vent Gas Vent Chimney, Duravent. Model OV is an oval Type B Gas Vent that provides the venting capacity equivalent to round Type B Gas Vent. Available in 4"- 6" diameters Aluminum inner liner Galvanized outer...