4", 45 Degree, Pellet Vent Elbow, Use To Offset Obstructions As Needed, Elbow Swivels 360 Degree At Base, Angle Not Adjustable, Designed For Stoves That Burn Wood Pellets, Patent Pending Venting For Stoves & Inserts That Use Wood Pellets, UL Listed For 3" Clearance To Combustibles In USA & Canada, Required For Venting Pellet Appliance Above 4,000'.