PS 9 Aug 2017: meanwhile Tije de Jong fixed me another modification that's even easier and simpler:
http://kostverlorenvaart.blogspot.nl/2017/08/fz94-vacuum-cleaning-click-on-click-off.html
After a number of roasts, some ash and charred debris collects in the space below the drum so we need to clean this frequently but carefully so as not to damage the isolation floor material below the drum of the heating elements. Poking around with a hard vacuum cleaning extension is therefore not a good idea.
I tried vacuuming and later settled on blowing.
Vacuum cleaning
Also, the air inlets are fairly small so you can't poke just everything through it. I used a Gardena hose section for this and the part that usually is screwed on the tap now fits snug on the inside of the vacuum cleaner hose that I have.
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| Garden hose meets vacuum cleaner |
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| Perfect match |
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| Gently sucking up the ashes |
The spacers of the air inlets do tend to slide off when you take out the screws so I found spacers that I can fasten: made by Krick "Modellbau vom Besten" for people building model airplanes and mini machines. They are also a tiny bit bigger so they allow more air through the inlets. Time will tell me if that's an advantage.
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| Air inlet, semi covered by a panel with 3 screws and spacers |
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| Spacers could slide off if your hand shakes a bit (old roastmaster) |
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| Alternative spacers come with their own fasteners |
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| Installed |
Later I bought a little air pump that's designed to quickly inflate an air bed or a little inflatable boat:
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| Bravo OV10 1kW blower, 250mbar / 3.6 psi |
I stick the mouth of the yellow tube into the funnel on top of the roaster and switch the blower on for a few seconds. Immediately all dust, ashes and small debris comes flying out the holes (and the bean release if you have opened it).
The disadvantage is that you still need to vacuum clean the immediate surroundings of the roaster and the workplace but it's always a good idea to do that frequently anyway.
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