[quote=“CAL7, post:17, topic:86374”]
I measured the actual rotation speeds at low=32rpm, medium=61rpm. The specs give the high at 292rpm, which I don’t doubt.
Given all the help - which I greatly appreciate! - I should have mentioned that I have the switch actually controlling two of these fans in parallel with mirrored performance. Is it possible the load is more than the switch can handle and that causes a reduced speed but only on the low and medium settings?
[/quote]With the advice here to use just one fan, I finally was able to get to the wiring and disconnect one fan to test a single fan load on the switch.
It’s - I guess no surprise - just about double the speed of two fans on the same 12730 switch. Low=61 rpm, Med=125 rpm.
This leaves me in something of a quandary. The low speed is still nearly useless but the medium speed is acceptable though my experience of it tells me that something like 60% (perhaps 180 rpm) of the max works be a good setting for medium.
Needing two circuits and two switches seems to be the inevitable conclusion, but that means wiring changes. One option, that might end up being the cheapest, is to use the Home Depot / Hampton Bay 4-speed controller that also has the benefit of a 4th speed. With that I have the inconvenience of two remotes when I don’t really want separate controls except for the necessity of having two speed controllers for the motors. I know I’m rambling, but any ideas are welcome.