gaz1
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- westyorkshire
all the home made garage ones I've seen use a bit of 100mm galvanised steel duct
just need to be careful where it goes through the roof incase it gets hot
this stuff....
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ive used it but mine is outside not inside of a building
also note it does loose its galvanised part of it due to its heat inside of it
but beaware of fumes being given off with galvanised pipe
make sure your flue pipe is 1 metre over your top of the roof you will need chimney supports below and above a fixed pipe will get around this problem
also note for 5" flue pipe you want a hole about 7" if your using a piece of inner tube or flat plate to go through the roof part
you can insulate inbetween this and allows you to silicone the outer tube to the frame or roof edge