12" Black S-Blade Electric Fan - High Speed Cooling Fan for Home, Office & Outdoor Use - Quiet & Energy Efficient Air Circulation

I am using this on a LARGE transmission cooler for my ALLISON 643 in my bus. I have it wired for direct control by an ON/OFF switch until my correct thermostatic control relay arrives, and it has been working perfectly!I called Flex-A-Lite directly and spoke to a tech before installing it like this. They assured me that this unit can run at 100% continuous duty cycle and it has worked perfectly.Some key points for me are...1. Its not NEARLY as loud as some of the other electric fans I have had in the past.2. its extremely powerful.3. The company that makes it is 100% in the USA...!4. Tech support is friendly and knowledgeable.5. The instructions were CLEAR, written in ENGLISH, and the installation was simple.