If you have been following this thread, you have learned:(1) ECM blower motors are beginning to dominate the market. The issue isn't going away, and will likely become more prominent as older furnaces start needing replacement.(2) ECM motors either will or will not create an RFI problem.(3) At least one manufacturer offers its dealers an optional EMI/RFI filter kit, which helps reduce (but does not cure) pulsed speed controller interference.(4) Additional work by the homeowner may improve things further, but may or may not invite warranty issues.In short, there is no concise and consistent answer. It is, like so many other things, highly situational -- the classic YMMV.Thanks to all who weighed in -- I very much appreciate it.73,Mark -- WA9ETWSent from my U.S. Cellular® Smartphone _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
