Look at that, Twin exhausts my new roaster is going to be super quick for sure! Roasting coffee produces a considerable amount of smoke, and the gas burner that heats the roaster needs a flue to exhaust it's gasses. And then when you release the roasted coffee to cool you need to suck cool air over it - that is why there are two exhaust on on the roaster, one for the drum and gas burner flue, and one for the cooling tray where the freshly roasted coffee is cooled quickly by sucking cool air over it and blowing it out of the exhaust.
Both however need to vent outside, and the manufacturer only supplies a short start off length for each which you can see in black. After that you need to purchase your own ducting or pay for an extraction specialist to do it for you. At this point it is worth pointing out the manufacturer expects you to run these pipes in the opposite direction to the back of the roaster, which would be fine except the other side of that window is a public street and road - I'm not sure anyone walking on street would like to be passing 300mm ducting just above their head, which could reach 180 degrees Celsius at full roast - plus it would have to then reach ridiculously high up to exhaust with a good draft. So instead I'm heading in, and then right as we look now to a courtyard roof that the building surrounds - then it can pop up through that without affecting anyone.
While the UK is still in Lockdown finding people to do stuff is pretty hard, and I fitted all the ducting for my 5kg roaster - so how hard can the ducting for the 30kg be? So after carefully measuring how much ducting I might need (guesstimate) I ordered everything I thought I might need from my favourite online ducting specialist - call obviously https://www.ducting-online.co.uk (does exactly what it says on the domain)
Happy Days - it all arrived today including the pipe joints, elbows, Y piece and my favourite bit the Chinaman Hat
Exceptionally handy in heavy rain, not so easy to see out of though lol.
First section "joined" to the manufacturers ducting - 300mm Toper ducting does not accept the 300m connection joints I purchased to join the ducting up - these are obviously less the inner diameter of the 300mm ducting - but just a smidge wider then Toper's black 300mm - fortunately I bought quite a few rolls of that "Magic duct tape" on instagram adds that sticks anything to anything - first point - instagram adverts are always a rip off. Second point - this tape actually works ok - but you get hardly on a roll lol - so you don't use it like tape you cut strips off and stick stuff together like that. So a few strips to keep the two pipes close together and then wrap it to death with high temp aluminium tape and the job is done. When the gas man connects the gas up he will definitely ask which experienced ducting specialist I used for this quality work ;-)
This gives you a better idea of the plan, the two pipes will now merge into one using the Y piece, then the single pipe has to come towards us and then turn right and pass the wall you see on the right before going up through the double skin metal roof above.
You might be wondering how I am keeping all this ducting suspended, well I'm using The Force - only it all falls down when I go home lol. The official brackets are designed to pretty much be attached direct to a smooth surface - as you can see that ceiling has never seen smooth and the height from the chaff collector is well below the ceiling line anyway. So I am suspending it with 2mm stainless steel wire - cut to length using (guesstimate) and screwed into the solid ceiling boards and joined using Simplex wire clamps.
One job I could not complete, wire a Three Phase power supply within a meter of the roaster, the building has three phase power already and so many fuse boxes to choose from but you need a real professional to wire three phase power and make sure the phases are correct - fortunately I have a really good electrician who has done a load of work already getting this ancient building upto modern spec - and despite the Coronavirus situation he was willing to come in and run me a power feed. Next up is the gas engineer running gas to the machine and we will be roasting very soon!
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