DuraVent PelletVent Pro 4" Inner Diameter Stainless Steel Vent Elbow with Black Outer Wall - 45-Degree: This unit necessitates a venting pipe with a 4" inner diameter. This elbow can be used to offset obstructions in your vent installation and swivels a full 360 degree at the base to make aligning of the parts easy. It was created with pellet and corn-fueled stoves and inserts in mind. The part has an air-insulated double wall construction with a 0.012" stainless steel inner wall and a 0.018" galvalume outer wall. It also comes with laser-welded seams, a sleek black finish, and twist-lock connections for easy assembly. It requires a 1" clearance to combustibles. The inner diameter of the part is 4", while the outside diameter is 4-5/8". It has a limited lifetime warranty and is UL listed.

45 Degree Elbow Efficiently vents pellet and corn-fueled stoves and inserts Offsets venting obstructions Swivels 360 degree at base .012" stainless steel inner wall and .018" galvalume outer wall Air-insulated double-wall construction Laser-welded seams Secure twist-lock connections Sleek black finish 1" clearance to combustibles 4" inner diameter with a 4 5/8" outer diameter UL Listed Limited lifetime warranty