Dimension of outer the frame is 120mm(L) x 120mm(W) x 25mm(H) / The size of fan in inch is 4.72in(L) x 4.72in(W) x 1in(H); The center to center distance beween the mountiong holes is 105mm/4.13in. There are two fan blades. one is actually fixed. Its function is increase air pressure. Rated Voltage: DC 24V; Rated Current: 0.2Amp; Rated Speed: 3000 RPM; Air flow: 114CFM; Noise: 49dBA Connector: XH2.54-2Pin; Lead wire: UL Type (+): Red wire ; (-): Black wire. This is a two wire cooling fan; Bearing Type: Dual Ball Bearings ; Life: working up to 50000h at 25 degrees. Please Comfirm the Fan Size, Voltage, Connector and other parameters before purchase.