I am looking to install an extractor fan for a bathroom project. Based on Vent Axia calculator and others, the cheap and cheerful 4" wall mounted versions pushed by the sheds is somewhat lacking. I am therefore conidering an in line fan with 5 or 6" ducting via the loft to an end wall outlet.
My questions are:
How to terminate the duct through the wall - previously I have used a wall terminal kit consisting of an external grill, a wall sleeve and a spigot plate so that the ducting can be taken from a fixed connection at the wall. I am struggling to find one for ducting larger than 4". Can anyone recommend a supplier, or advise a suitable alternative?
Vent Axia offer a mixed flow fan ACM range. These look pretty good but I am being quoted £110 (+ £35 for timer) for a 6" version!! Are they worth the big bucks?
Any general advice on ducting installation would be gratefully received.
TIA
Phil