Just fitted a 4" wall-mounted Monrose extractor with a timer that was bought from Screwfix last month in my downstairs shower room/toilet. The room is approx. (W)2m x (D)2m x (H)2.5m, and the ducting is around 40-50cm long (the depth of the external wall). I also fitted a grill with draft shutter on the external wall.
My problem is that the fan doesn't seem to do very much at all. It hardly manages to open the shutters when running, and when holding the shutters fully open the airflow is hardly noticeable. Also, I tried to place a small piece of tissue in front of it (with the shutter held open), and it hardly managed to keep it sucked to the front grill.
Is this normal for a fan of such size (85 m3/h)?
I am seriously thinking about replacing it with a 5" one. Does anyone know of other suppliers other than
TIA,
J.