I need some advice please. I had an in-line loft fan fan installed to help with condensation in the shower room. Unfortunately the guy who did the job rerouted the system wrongly. I was later told that the fan is in the wrong place of the the junction! 1 can anyone recommend where the fan should be? 2 I was also told that the condensation trap is not doing anything, that its in the wrong place! (its the black small circular bit in the vertical pipe nearest to the camera) That the water will run into the fan, and that a dark water stain is already is visible by the fan on the floor where water has leaked Looking at the pictures is this true? Also now the smells from the kitchen go into the bathroom as although he installed a back draft shutter, the pipe duct leading downwards into roof floor into the bathroom ceiling is too short to install the backdraft shutter so now every time the kitchen exhaust is on it feels like you are having your hair blow dried and the smells come from the kitchen into the bathroom 3The other person coming in to correct the job (he to just separate the kitchen and the bathroom duct so that they dont share the same duct, and have them join just before they exit the roof) He however said he will only work with aluminium spiral duct which has ridges in, he doesn’t work with plastic he says. 4 I am concerned that the warm wet air collect in the ridges and when it cools just sit there,and so wont do its job properly (the vertical pipe by the wall is the soil stack. The one where the fan is attached is for the toilet and kitchen) Please can you give me your advice or opinions?