Well thanks to Nutone for foresight on their bathroom vents. When I saw that the engine block was a replaceable block inside the case (just unscrew and separate) I realized I didn't need to replace my old breather block with a new one. This meant I didn't have to worry about retrofitting the existing space in my ceiling with a new block, cutting or plastering the ceiling, etc. The motor cost about the same as the entire air handling unit with the new motor , but thanks to youtube it was easy to replace the old motor with this new one. I had to reuse the old motor mount and make some modifications, but the new fan works great. Time will tell if there's durability, but for now (after 1 month of use) it's working.
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