I'm just in the middle of building a UDS, however I've just realised I haven't done anything for a chimney, how have you all done your chimneys & is there anything you would do differently?
I'm planning to use the lid from my oil drum (I got one with a clamp on lid) Mainly need to know what diameter I should be thinking for the holes as I know I cant have them too big or air would get in through them!
As inlets I've got two 3/4" ball valves, but they aren't full bore, I'm hoping they will provide enough air, if not I can always add two more!
I haven't taken any pictures as yet, however am happy to do so if anyone is interested, also all my parts were sourced from eBay so if people want i can also send links!