Review on 🌬️ AC Infinity MULTIFAN S7, Ultra-Quiet Dual 120mm USB Fan, UL-Certified for Receiver DVR Playstation Xbox Computer Cabinet Cooling by George Miller

I built a built-in cabinet for a home theater system, but I have a ventilation problem. Fans run on boost (see below), average temp dropped 40° FI, noticed the fan label says 3 to 6.5 volts so I bought a USB DC-DC Boost Boost Converter for $3.68 here at Revain. I set it to 6.5 volts and connected it to a USB power supply. FANS come to life! Giving them a nominal 6.5 volts compared to the standard 5 volt USB power supply has almost doubled the rotation speed, making the variable speed switch a useful option now. The switch has just saved me time and money. The special fans I bought were returned to the warehouse but arrived in perfect condition like new. The fans are very quiet and blow cool air through my AV receiver as I write this review. Only time will tell how long they will run smoothly and quietly. .—(02/24/18 still smooth) Overall I am happy with my purchase and would buy again at any time. I am not affiliated with this or any other product. I received nothing in return for my review. .I recommend this product and this booster.