What Jim is describing as a “variable speed fan,” in the context of RFI
production, is one that is continuously variable, not one that has speeds
controlled in discrete steps. See below what I excerpted from his explanation.
Howard N7SO
> Is there a variable speed furnace fan that has a high, medium, and low speed
> setting?.....
>
> Yes.....
>
> See <https://highperformancehvac.com/ecm-blower-motors-2/>
>
>
> 73,
>
> Gary ~ AB9M
> on behalf of Jim Brown
> Think of a
> variable speed motor as being more like a volume control, so its speed
> can be varied over any value from zero to high.
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