Kitchen extract through flat roof

[askman]

Does anyone have a suggestion for a product to use to go through a flat roof for a kitchen extract fan? It is a traditional felt roof.

 

[noseall]

A short piece of plastic (110mm) drain pipe, a vertical lead multi slate and a mushroom cowl glued on top. You will need to support the pipe with some ceiling timber cradling until the flat roof material has got hold of everything.

Not sure what you'll do if its a 125mm duct though...?

 

[Aunsh]

You could search for a flat roof extraction vent, which will probably take you to a supplier of Ubbink or Klober vents in a variety of pipe diameters. I have fitted a couple of 100mm Klober units in the past.