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I want to control the speed of this exhaust fan the same way household fan speed regulator works (The speed is discrete, using 0,1,2,3 button. the higher the button the faster fan spin)

how do i do that? 2 can i use the the circuit above?

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marked as duplicate by Dave Tweed Jul 7 at 14:43

This question was marked as an exact duplicate of an existing question.

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    \$\begingroup\$ Almost exact duplicate of What happens if I reduce the air flow for an exhaust fan? which is on hold. Please fix the original question instead of posting a duplicate. This question doesn't supply the details requested in the comments on the original question. \$\endgroup\$ – Transistor Jul 7 at 14:17
  • \$\begingroup\$ Note you specify a 4 position switch (off & 3 speeds) but the circuit has off and 4 speeds, ie a 5 position switch is needed. \$\endgroup\$ – Solar Mike Jul 7 at 14:31
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    \$\begingroup\$ If you have additional information related to your original question, use the "edit" button to add the information there. It was put "on hold" in order to allow you to improve it before people try to answer it. Do not create a duplicate question. \$\endgroup\$ – Dave Tweed Jul 7 at 14:44

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