The IAUBVC from Centrotherm is a universal B-Vent cap. It allows for multiple flue configurations when utilizing existing B-Vent as a chase. Available configuration options include: 1 x 2" flue, 2 x 2" flues, 3 x 2" flues, 1 x 3" flue, 1 x 2" & 1 x 3" flues, 1 x 4" flue. Overall dimensions (LxWxH): 10" x 10" x 10".