Size: 4". 4 Inch in diameter. The product is UL listed. Double-wall pipe that has been laser welded. Only use on horizontal terminations. Constructed of .012" inner wall of 444 stainless steel 0.018" laser-welded galvalume outer wall. To divert exhaust, it can be twisted at the gore. Venturi effect is created to force exhaust out. This unit necessitates a venting pipe with a 4" inner diameter. If you have a wood pellet or oil-fueled heating device and want the finest ventilation, the DuraVent PelletVent Pro Round Horizontal Rain Cap with Tapered End is what you need. Its horizontal design is compatible with DuraVent PelletVents with an inner diameter of 4". This is meant to go with horizontal vent pipes. It is UL approved and made of stainless steel.

Size: 4 Inches UL listed Laser-welded double-wall pipe Use for horizontal terminations only 0.012" inner wall of 444 stainless steel 0.018" laser-welded galvalume outer wall Can be turned at the gore to direct exhaust Designed to create Venturi effect to force exhaust out