Dimension of outer the frame is 80mm(L) x 80mm(W) x 25mm(H) / The size of fan in inch is 3.15in(L) x 3.15in(W) x 1in(H); The center to center distance beween the mountiong holes is 71.5mm/2.81in.

Operating Voltage Range??5.5V to 13.8V. (overtake to 13.8V, it can also work. but not safe, and seriously affects lifespan of fan.)

Rated Voltage: DC 12V; Rated Current: 0.2 Amp; Rated Speed: 2800 RPM; Air flow: 43.6CFM; Noise:31dBA; Power: 2.1Watt

Connector: XH2.54-2Pin; Lead wire: UL Type (+): Red wire ; (-): Black wire. This is a two wire cooling fan; Bearing Type: Sleeve Bearing ; Life: working up to 35000h at 25 degrees.

Please Comfirm the Fan Size, Voltage, Connector and other parameters before purchase.
Specification
Dimension: 80x80x25 mm (3.15×3.15×0.98 in.)
Mounting Hole Distance: 71.5 mm (2.82 in.)
Screws Hole Diameter: 4.3 mm (0.17 in.)
Start up Voltage is 3.9V
Operating Voltage Range: 5.5V to 13.8V
Operating Temp Range: -40??(-40?H) to 70??(158?H)
Bearings: Hydraulic Bearing
Rated Voltage: 12V DC
Rated Current: 0.2 Amp
Power: 2.1 Watts
Rated Speed: 2800 RPM
Air flow: 43.6 CFM
Static Pressure: 0.31 In H2O
Noise Level: 31 dBA
APPLICATION
This 80mm x 80mm x 25mm cooling fan is popular in a variety of electronics and components such as computer case, amplifiers, power supplies, grow tents, LED lights, RV refrigerators, cabinets, battery boxes, Psu, toy hockey table, ham radio, incubators, inverters, greenhouse, LED heat sinks, power converter, electronics enclosure, and other DIY projects. or as a replacement fan for many products.
Packing List
1x DC Brushless Fan
1x 80mm Fan Guard
4x Screws and nuts