Read the rest of the comments. This is a moronic device for a self protected
motor / fan system.

No air movement = higher motor speed = less work being done = less stress on
motor = less current draw


"Robert Green" wrote in message
...
Art, that's perhaps the best solution I've ever gotten to a question I've
posted
on the net. $10!!!!!! That's just what the doctor ordered. Thanks very
much!

--
Bobby G.




"Art Todesco" wrote in message
...

stuff snipped

Does anyone have any ideas how to detect the "laboring" of the motor so
I
can sound a chime or some other alarm when something clogs
--
Bobby G.

Here's a unit that will open up whenever
there is a vacuum pressure increase.
http://www.thinkvacuums.com/beam/valve.html
I'm sure others have similar products.