HF DC Thien Baffle and duct sizing HELP!

[chocdog]

I am currently ready to finish my HF DC cart, new baffle lid and to start ducting my shop.  The cart has the blower flipped and a short straight shot the the baffle.  That will be a 5 inch diameter connection.  I would like to duct the dc to the majority of my tools, planer, jointer, band saw.  These tools will be inline over about 20'-0".  My table saw will be connected via 10'-0" flex hose.  My question is what size should the main run be? 6"? 5"?  Would it be okay to be 5" on the baffle outlet side and 6" on the inlet side?  My machine connections will be a short distance from the main duct, 2'-3', and 4".  The total duct run from the dc to last tool would be about 30'-0" with 1 turn.  The DC has a Wynn filter.  I would like to duct the dc to minimize moving the dc all over the garage and around all my machines.  Is this plan viable?  Is there a easy way to convert the impeller cover to 6"?  Are there after market covers available?  I that a good idea?   I'm such a noob! :-X 
Any advice would be greatly appreciated! :D

[chocdog]

anybody?

[retired2]

Start by donwloading this 2003 issue of American Woodworker for $5.99.  It contains a feature on Central Dust Collection.  For a long time it could be read free online and I linked it here many times.  Those days are gone.  If you don't have $6 to spend, the article says 5" duct is all you need for 1-1/2 HP systems.  These are usually systems rated around 1250 CFM.
http://www.shopwoodworking.com/american-woodworker-may-2003-digital-issue

Also, you should read this (free).  It also warns that few dust collectors in the size referenced above are capable of handling 6" plumbing.
http://www.deltaportercable.com/uploads/PCD/Documents/News/182DustCollectors.pdf

And let me warn you 30 ft. is a long way for dust collectors of this size with a Thein separator.  The one thing in your favor is you say you only have 1 turn in that distance.  That will help a lot, because turns consume far more SP than straight runs.

And finally, since you have very few bends, spend the money to buy long radius bends, they will conserve SP far better than tight radius bends.  You do not want 1xD bends!  And finally, eliminate every inch of flex hose that you can.  It is the equivalent of three times the length of straight pipe.

 

[chocdog]

I was thinking of splitting the distance by placing the dc in the middle of the machine run.  Thanks for the response.
You are a plethora of information.  I'll take a look at your referenced material.