The SF-1020 SuperBench from SuperFlow measures and records air flow at OEM engineering accuracy, and easily switches to intake or exhaust flow direction. The SF-1020-SB automatically regulates test pressure based on keypad input. Testing is generally performed at 50" to 65" (130 cm to 165 cm) of water test pressure. A unique variable flow orifice adjusts flow range between 25 cfm and 1000 cfm, based on electronic input to fit valve size or lift.