Model ZK-SJD115 Disk Size 4-1/2＂(115mm) Free Speed RPM 9000rpm Power W 500W Weight lbs.(kg) 3.42lbs(1.55kg) Sound dBa ≤90dB Air.lnlet in. (mm) 3/8＂(10mm) Min. House Size in. (mm) 1/4＂(6.35mm) Avg. Air Consumption CFM 4.1cfm(116l/min)