Originally posted by: djheater
Faulty vent\exhaust fan.
probably the motor going bad.
Why don't you go up there and wait for it to happen?
Originally posted by: zixxer
The thing is - I've been up there before, running coax for an hdtv antenna - and really didn't notice anything out of the ordinary. There were definetely no hornets or anything of that nature. It always comes from the same place, which is sort of near a vent. I would think it was maybe resonating from the furnace or something but i dont hear this noise from any other vent.
Originally posted by: cavemanmoron
figure it out yet?