I will have toilet and kitchen extractors exiting through the tiled
roof. Due to the low pitch, I cannot use standard tile vents or ridge
vents, I will need a flashed 110mm pipe for the outlet. Now, several
of these tend to look horrid. so can I combine the two outlets ?
They could be combined at the last minute using soil pipe connectors
to avoid back flow into the other ducts.
Cheers,
Simon.

You could use a "whole house" extract like this:

http://www.screwfix.com/prods/73594/...ACTION-_-73594

sm_jamieson wrote:
I will have toilet and kitchen extractors exiting through the tiled
roof. Due to the low pitch, I cannot use standard tile vents or ridge
vents, I will need a flashed 110mm pipe for the outlet. Now, several
of these tend to look horrid. so can I combine the two outlets ?
They could be combined at the last minute using soil pipe connectors
to avoid back flow into the other ducts.
Cheers,
Simon.

You can have it exiting through the fascia board - this is far easier,
cheaper and less time consuming than a tile vent, and isn't as visible.

--
Phil L
RSRL Tipster Of The Year 2008