extraction fan termination on pitch roof

[gdp14]

hi
i have just discovered i have to fit an extraction unit in the ceiling of a bathroom above a shower, the ceiling is horizontal and has two layers of plasterboard fixed over an old lathe and plaster layer so is pretty thick. there is then about 18'' of space between ceiling and the underlying felt of a victorian slate shallow pitched roof, which has a small parapet wall at the top.

my first question is about access,? is there a roof ladder which will hook over the parapet (approx 2ft high with 'ridge' tiles on top, it is horizontal)

secondly any recommendations of termination kits for pitched roofs, easiest to fit, ?quality? instructions for doing so!

thirdly, how do you go about connecting what gets pushed up through the ceiling with what comes down through the roof without making a big hole in the ceiling? or is that unavoidable!

many thanks in advance for good advice

 

[^woody^]

No for the first one

No for the second one - any should do

For the third one, if you cant get in the roofspace and don't want to disturb the ceiling, then you would enlarge the hole in the roof felt and work from the roof

Or connect the [flexible] fan duct to to terminal (which will be close to where the fan is to be fitted below), then feed the duct into the roofspace from the roof fit the terminal, put your hand up the hole cut in the ceiling, and grab the duct and pull it through. The cut it as necessary and connect to the fan