The Octo AF-120 4.25" Variable Speed Fan automatically increases or decreases the fan speed depending on the ambient temperature of the area surrounding the thermostat. The fan will increase speed at 90 degrees F and continue to increase until full speed at 110 degrees F where it will reach its maximum CFM.

The variable speed capability makes this Fan an excellent choice for aquarium canopies, enclosed stands & equipment cabinets to help regulate the temperature within. Keeping these areas cool will help reduce heat transfer into your aquarium and avoid dangerous temperature spikes while also ensuring long lasting performance of your equipment.

Features:

• Automatically ramps speed based on temperature. Max fan speed: 110 CFM.
• USB power end with safe low voltage power adapter. DC 5V.
  
• Plug and play operation
• 16" thermistor cord. 78" power cable.
• Dimensions: 4.25" X 4.25" X 1". Mounting hole spacing: 4.13".
  
• Mounting screws not included