A pipe, shaft, or conduit that carries something downward, especially smoke, air, or exhaust in industrial or mechanical systems.
Compound of 'down' and 'take,' meaning to conduct or carry. Industrial terminology from the 18th-19th centuries describing mechanical systems.
In massive industrial smokestacks, the 'downtake' is where super-heated gases get funneled down and cooled—it's essentially a controlled descent for something that wants to stay hot and rise.
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