Reef Octopus

USB Smart Fan

Grouped product items
AF120 USB Smart Fan - 4inch

SKU: 250039

In stock


- +

The Reef Octopus USB Smart Fan automatically increases or decreases the fan speed depending on the ambient temperature of the area surrounding the thermostat. Its ability makes the Smart 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.


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.



  • Automatically ramps speed based on temperature
  • USB power end with safe low voltage power adapter
  • Plug and play operation
  • 16" thermistor cord
  • Available in a 3 inch and 4 inch model



Model Dimensions Fan Speed Power Cable Length Thermistor Length Mounting Screw Holes

AF80 3" Smart Fan

3.15" x 3.15" x 1" 25 - 55 CFMs depending on
surrounding temperature
78" 16" 2 7/8" / 72mm apart

AF120 4" Smart Fan

4.72" x 4.72" x 1" 65 - 100 CFMs depending on
surrounding temperature
78" 16" 4.13" / 105 mm apart
Fans are rated for 2000 hours and are not intended for continuous use.
More Information
Dimensions 4.72"L x 4.72"W x 1"H
WiFi No
Power Cord Length 6 Feet
Additional Notes Fan Speed: 65 - 100 CFMs depending on surrounding temperature
Temperature Control Preset (No Controls)
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Product Questions

What makes this a "smart" fan? I see the one lead wire - what does that connect to/what other item do I need (thermostat?)
Question by: Kenneth Babich on Apr 7, 2022, 9:04 PM
Hey there,
Thank you for reaching out to us. This fan has the ability to turn up and down based on the ambient temperature where it is located. You do not need anything else for this fan and you just plug in the included power supply. I have attached a video for more details on it.


Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Apr 8, 2022, 7:45 AM