I would imagine those off the shelf motors are relatively cheap...
What I mean by a canned motor is one specifically made for each of these compressors and will not fit much else. Privy and exclusive to the manufacturer.
Now, what I would like to see is these people adapting NEMA (off the shelf) motors so we all have options.
I think I mentioned the small motor rule that took effect this spring, but these guy's squeaked by that so you'll all have to live with it. It was actually a screw up on the gub part, but think private dollars to the right people played a major role
