ECM (Electronically Commutated Motor) - who sells them, how much?

Who sells ECM motors (1/4, 1/3 or 1/2 hp) and how much do they cost -
(over-the-counter) ?

Unless I'm wrong, they seem to only be available as integrated into
HVAC systems (furnaces) and maybe only to HVAC
installers/contractors.

Are they sold to the general public- perhaps to those wanting to
replace their existing AC fan motors?

Bonus question:

Do ECM motors radiate EM/RF noise, or back-feed noise into the house
wiring?

 

How does an ECM differ from what is called a brushless dc motor?

Bill

 

Hmm.
Other wise know as a DC brushless or AC motor?

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