Hi. Just installed one of the above. Works to some degree, only problem is even though it's a quiet one, where i have installed the fan is directly under a bedroom, and unfortunately i can hear a hum! Not a problem during the day but in dead of night if some one has a shower and switchs on the light, this may cause a problem. Was wondering if there is some thing i can do, like maybe mount the fan into the eves outside. PS is there a limit to length of ducting between the inlet and the fan? As if what i asked was possible then the ducting run would be approx 1.5metres. Cheers in advance.