A friend dropped some items by yesterday afternoon. He is an
electrician who is retiring and will be moving
south this fall to to avoid the snow. Among the stuff was a box of 12
TDK ANF-106U RFI filters.

TDK makes a RFI filter that plugs into a standard USA duplex power
outlet and has single AC recepticle
for the device to be fitlered. The unit is rated at 6A and it has a
built in breaker.

I did a quick net search and found them at several surplus sources,
http://www.sphere.bc.ca/test/acfilters.html#catalog

A quick test shows them to be pretty effective.

Not as good as the 2 stage Curtis filters I have mentioned, but the
ease of use makes them attractive.

These fitlers can be stacked. That is one plugged into to another for
twice the RFI supression.

Terry