DuraVent 45/60 Adjustable Elbow - 3BVL45We believe people deserve to live and work in buildings that maintain comfortable temperatures to support well being. A wide range of quality products to maintain, clean, and repair wood or gas stoves, fireplaces, hearths, and chimneys both indoors and outdoors.. Features Used when an Offset is Required to avoid Obstructions such as Rafters, Joists and other Construction Obstacles; Three Piece Adjustable Elbow rotates 360 for Perfect Alignment;