spiral ducting for new extraction advice needed

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frosties

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scotsman in cornwall
Hi there. I've just bought the following items and need to get the spiral ducting sorted out
Bandsaw/resaw
http://www.startrite.co.uk/index.php?se ... and+Resaws
Planer thicknesser
http://www.startrite.co.uk/index.php?se ... hicknesser
Extractor
http://www.startrite.co.uk/index.php?se ... Extraction

The hose outlet for the extractor is a 220mm. I'm trying to work out when the best time to use a reducer?? do I reduce by the extractor? do I have a reducer just before the machine?
Heres what I propose to do

I appreciate any advise before I splash out on ducting blast gates and angles. I'm not too sure if the unit has enough oomph

Print by frostie's, on Flickr
 
Always reduce as close to the machine as you can get, NOT at the extractor.

Are you planning on using the alloy gates supplied by spiralux, I ask because the ones I got leaked a bit of air. I returned mine back for a refund & made my own.
 
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