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Topics - Sthutch

#1
Hello to all!  What a great resource this is!  I have spent the last couple of days reading through the various posts and preparing to construct my Top Hat based on Retired2 design.  I am very grateful for all the hard work all of you have put in on these designs.  I will be putting this "upstream" on my 2hp DC.  I already have a Wynn filter, the DC doesn't come until Friday.   I have tried the search function, but I can't seem to put the correct search terms in to get the results I wanted.My problem is I can't seem to find answer to my last remaining questions.

1. I am planning on having a 6" inlet and outlet, but I am concerned that it is too wide for a 20" trash can. With an inlet that wide, will the 6" outlet pick up the smaller particles, or will they be going so fast that the suction won't pick them out the the incoming stream?

2. Will the above problem be made worse by adding a bellmouth to the outlet?

3. The area of 6" inlet is 28.27sq in.".  Would it work if I used a transition to a 3.24" x 10" (32.4sq in.).  Home Depot carriers this, but it seems like it is to short.  Also, this would raise my Top Hat by 2".

   https://www.homedepot.com/p/Broan-3-1-4-in-x-10-in-Rectangular-to-6-in-Round-Galvanized-Steel-Duct-Transition-411/202913013?MERCH=REC-_-rv_homepage_rr-_-NA-_-202913013-_-N

or this one, 4"x8" to 6" round

   https://www.amazon.com/Master-Flow-Register-Box-Flange/dp/B00FK8TMD8/ref=sr_1_fkmr1_4?s=hi&ie=UTF8&qid=1522716799&sr=1-4-fkmr1&keywords=4%22x8%22+to+6%22+round+duct+transition

Any and all advice is welcome.
I would also like to express my appreciation to Phil and Retired2 for all the work they have done on this project!

Sthutch