Review on 🌡️ Derale 15840 Hyper Dual-Cool Remote Cooler: Optimal Temperature Control for Peak Performance by Chris Munns

Bought this fan for my 2006 Dodge 3500 Cummins and it works great. It's an exhaust fan, not a pressure fan, so it's more efficient. It also uses a bar and rack heatsink instead of the standard fin heatsink. I installed this on a frame rail under the bed; nice and compact fan. It comes with 2 wire connectors, one for each fan, which I had to cut and pin. I hooked up a switch for a fan and didn't use a thermostat; I monitor the temperature of the transistor with a sensor, so I just turn it on when needed. It helps me keep the temperature down when towing and driving around town. Great product, thanks Derala!