Big air flow: 223CFM; DIY used for purposes such as circulating air in basements, creating airflow in workspaces, ventilating greenhouses, small radiator, amplifier, gaming pc case and improving air circulation in enclosed spaces to reduce heat buildup 140mm Fan parameters: Rated Voltage:12V 1.5A; Speed: 3000RPM; Air flow: 223CFM; Noise:46dBA; Connecter: XH2.54-2Pin; Cable Length: 30cm Or 11.8 inches; This model is designed to maximize airflow and can be too loud for some applications Bearing type: Dual Ball Bearing ; Life: 50000 hours; Allows the fans to be laid flat or stand upright. its effectiveness in generating powerful air currents akin to a hurricane within a space High CFM Fan: The reverse design of the fan frame makes the air volume more concentrated and the air volume is farther away 140 mm case fan: Dimension: 140mm(L) x 140mm(W) x 38mm(H) / 5.51 x 5.51 x 1.5 in. per fan; Package include: 1 Piece fan include fan grill and mounting screws & nuts