Color command Fan noise !!

Hy there.

I use 6 colorcomands 800w,an the fans do the normal noise,but its to mutch for use in theater production.
Peoples are sitting 4 meter distance ,an the fan do to mutch noise !

I have do follow : I have place a 1.5 Kohm potentiometer between the + of the fan,an now i can regulate the speed of it !

MY question: At what for temperature the stepmotors max. can work ?
The glass and color glasses can they cracked at 20-30degres cel. more!

I do also rubber isolator between the fan fixtures an body op the spot !
Have anywhere a better solution for stopping the fan noise ?!
You can also answer in French or German languish.
Thanks for help an your ideas !
Have a nice day!:confused:;)

Riggerstage
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