Manufactured by Comair Rotron to military specifications (NSN is 4140-99-588-0088) as their type Patriot 028254 model number PT2B3, these are a 115V ac 50 / 60Hz 30W axial rotary fan.
Frame Dimensions: 172mm x x 51mm
Supply Voltage: 115VAC
Flow Rate - Imperial: 200cu.ft/min
Flow Rate - Metric: 340m³/h
Noise Rating: 54dBA
Bearing Type: Ball
Series: Patriot
Approval Bodies: CSA, UL, VDE
Colour: Black
Current Type: AC
External Depth: 51mm
External Diameter: 171.5mm
External Height: 172mm
Operating Temperature Max: 70°C
Operating Temperature Min: -28°C
Power Consumption: 31W
Speed Range Max: 2880rpm
Type: Patriot
Weight is 1.1Kg
New and unused original spare parts.