TAC17251115HW is an AC Ball Bearing Fan from US Toyo Fan. It has an airflow of 235 CFM, Acoustical Noise: 50 dB (A)), RPM of 3100. The frames are aluminum alloy in painted black finish, bearings are ball, and impeller are made from UL94V-0 Plastic. It measures 6.77 in. dia. x 5.9 wide x 2.00 in. thick (172mm dia. x 150mm wide x 51mm thick), and weighs 35.3 oz (1000g). The fan operates at 115VAC (75VAC min) at a temperature range of -20° to + 80° C. Its insulation is Class B with a resistance 10 Megohms min @ 500 VDC and dielectric strenght of 1,500 VAC for 1 minute. Termination are through lead wires. The fans are designed and manufactured to prevent "burn-out" failure caused by restriction of rotating parts. It meets UL 106227 & CSA LR702499 and are impedance protected.