Long have people bought the biggest fans that the DIY shops sold and frankly, they are appauling, we needed something better.

As I have a sort of 'passion' for overkill, these fans became available after a re-fit on a £14,000,000 21MW power converter, they had come to the end of their 5 years life after which they get replaced, this converter was not turned on for most of that 5 year cycle so 3 fans made their way to Chez Ceil.

your average circulating fan from B&Q uses about 300w and creates a slight breeze, the bouncy castle fans usually top out at 1.5HP and are more for pressure than flow, these puppies are for pressure AND flow, they are rated at 7.5 Horsepower, 5.6KW 415v 60HZ delta, we had a sensational PWM power cnverter to drive them so you probably heard Bear winding them up and down in the nightclubs at CF2012

we were able to push a 150KG / 330LB cart round the test hall at work quite efficiently without taking these over 1/2 power, laid face down they hovered about 3" off the floor

we had one circulating air in the nightclub and the other aimed out a door to pull a nice breeze through the venue, they worked a treat.