BMC Twin Air Conical Air Filter, Connection 110mm, Length 140mm S40 We conducted CFD simulations on do88 kit87B We conducted CFD simulations on most parts and several tests to make sure we deliver the best performance upgrade Bend: 90 degree Inner diameter 1 (mm): 70 mm Inner diameter 2 (mm): 89 mm Inner diameter 1 (inch): 2 3 4 inch Inner diameter 2 (inch): 3 1 2 inch Leg length (see picture): 125 mm Color: Black Wall thickness: 6 mm Temperature range: 40 to +180 degreeC Outer diameter 1: 82 mm Outer diameter 2: 101 mm Reinforcement: 5 layers Material: High quality silicone rubber polyester fabric BMC Filters use a cotton filter material that encourages the passage of a large air flow but A Ø: 110 mm B Ø: 152 mm C Ø: 135 mm D: 186 mm E: 46 mm CFM @ 6Mbar: 379 CFM