Silenced Revolution EC Vector FanSILENCED REVOLUTION EC VECTOR FAN The most efficient fan on the market is now also the quietest, thanks to the new purposely designed acoustic housing. The Revolution Silenced EC Vector Fan is the answer to your noisy grow room problems! The cleverly designed housing encases the Revolution Vector EC fan in a white sound absorbing foam. This foam will absorb all noise without actually restricting any air flow, meaning the fan mechanism inside isnt