Caulk between blower housing and cyclone body
Caulk between blower housing and cyclone body
I just finished this step, and I think the question was whether or not to caulk between the MDF ring of the blower housing and the MDF ring at the top of the cyclone cone... Those two pieces of MDF are held together by the six (basically sheetrock) screws.
To be safe, I caulked the gap around the inside of the ring, where the two pieces of MDF met. It was easier and cleaner than caulking around the outside, and used a lot less caulk.