Top Hat Double Height Entry Question

[Howard In Toronto]

Hi all -

It's been a long time that I've been here!

As soon as there's no snow on the driveway, I'd like to build my Top Hat Double Height Thien unit.

I have a few questions about inlet placement and area opening -
- I want a rectangular opening into the Top Hat rather than a round opening
(I use 6-inch hose)
(I am thinking of fitting it onto a 6-inch HVAC boot)
- How much does it matter if the entry into the Top Hat is somewhat centered rather than at the top
-Because the opening is rectangular, do I make the area of the opening match a 6-inch hose's area
(in this case an area of +/- 28.25 sq inches)
- If inlet placement at the top is important in a Double Height Top Hat and I use 6-inch OD plumbing pipe instead, how much does it matter if the incoming dust just drops onto the "floor" of the area leading up to the rectangular opening and should it "ramp" doward to the opening

Thank you.

Howard