"I bought 2 Vent Axia ACM 150T fans to REPLACE 2 brand new Xpelair XIM 150T fans which I discovered had a design fault. Xpelair deny there is a problem with their fan but I found that if the cable from the switch to the fan was longer than 3m the fan would run but would not switch off after the timed period! A 3rd Xpelair fan sent to me from Xpelair also had the same problem. Both Vent Axia fans worked perfectly first time! I have only rated the reliability of the fan 3 stars as it is only possible to judge the reliability of a product after a number of years."