First, HK change the box cover. The box says SUPER EDF 70mm, wrong. This motor in its current format is only suited to 5 blade EDF 70mm units. The word SUPER would emply that it will work on any 70mm unit with no problems, try it on the 10 blade and see what happens. They do work on this unit but on S4 you have to reduce the throttle down to about 75pcnt to stay close to motor maximums. This motor otherwise is very good in all aspects. To improve the motor would be to get it produced to 1100 to 1300 watts at 55amps to handle the 10 blade fan unit, none of your motors at present are good enough for this fan unit. Also as mentioned in a previous review, the motor mount extention is 7mm short to suit most 70mm fan housings.