I have a rvk 150L fan, in an insulated box, hung from bungee cords from the rafters in my ceiling. Extracted air goes out a chimney vent. I have a 150mm carbon filter all connected with acoustic ducting. I'm now hearing a buzzing sound in my house. Worried the neighbours may hear it, especially in the early hours of the morning. What's causing this buzzing and how can i get rid of it? Thought primairs weren't supposed to buzz?
This post has been edited by johnnyplant: 22 April 2012 - 12:52 PM