Hi, i want to fit a shower fan and run the venting via the loft , i have just spent some considerable time trying to find a suitable outlet via soffet boards etc , i can get a run down to the corner of the roof where their is aprox a gap of the size of a small paperback book.(lying flat) Not sure if this is enough for venting . The perfect way would be to go Through the breeze block which i believe would then be brick then fresh air (semi detached). Could any one please advise what would be the best way around this . The full run of the ducting will be 8 feet from the fan. Thanks