Ruck fans very noisy ?

I,ve got a ruck fan and a system air both 150,s and move equal volume. When The ruck fan is used with a fan controler the buzzing is horendesly noisy. Is it that mines is fualty or are they not suitible for fan controlers or are the just crap ? It will be interesting to see if anyone else has used them, and what they thought ? tcd

Id say it doesnt work with the fan controller or a slight quality issue. For instance when they balance these fans they balance them at least say 4000rpm. If you have ever driven a car with out of balance wheels you will know that they dont vibrate all the time just in between a certain mph.

Edit : you will notice small clips on the fan blades, these are the counter weights. Dont fuck with them just telling you thats what they are haha

Sorry it,s a buzzing noise not mechanical, when the fans are just ticking over and the voltage is down, thats when it buzzes,humms pretty badly ? There,s no isue with quality, i know it,s shite ! Regards TCD