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The well tempered roaster
allenb
My point was that one should avoid large changes in air flow that result in slow minimal spouting at one point in the roast and towards the end, blasting them towards the top of the roast chamber in order to keep ET low enough to keep rate of rise in check. Most fluidbed designs force one to go to these extremes in air flow if maintaining a constant heat input but if you're able to get through a roast without this occurring then all should be good. All of the ones I've built or used required extreme variation if heat input was fixed.
1/2 lb and 1 lb drum, Siemens Sirocco fluidbed, presspot, chemex, cajun biggin brewer from the backwoods of Louisiana
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