Middle Atlantic AXS-FAN / AXS-FAN-K Maintaining the temperature inside enclosures is critical to the proper functioning and survival of the equipment operating within them. Features: -Smooth, ball bearing design for quiet operation. -Slim design for flush mounting. -Hardware and cord are included. -Select from one or two fans - AXS series units have cut-outs for up to 2. Specifications -Voltage: 115V. -Free Air Rating: 30dBA. -Free Air CFM: 57. -Fan Size: 4-1/2" x 4-1/2".