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Related links:
http://freshcapmushrooms.com/learn/keeping-it-clean-how-to-design-and-build-a-laminar-flow-hood/
https://www.familyhandyman.com/automotive/car-heater-repair-tips-fixing-a-blower-motor/view-all/ -- "Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds"
Details from one of the two blower fan units extracted from a car air conditioning/circulation system: