The Centrotherm ISRD0302 transitions vent systems to a smaller diameter. It features a nominal diameter of 3", reducing to 2". Overall Length is 6", with an Effective Length of 3.5".
Transitions vent systems to a smaller diameter Nominal Diameter: 3" (80), reducing to 2" (60) Overall Length: 6.0" (153) Effective Length: 3.5" (89) Maximum OD: 3.2" (80)