Dust collection parts source?

I'm looking for a source ( online ) for 4" and 6" pipe + fittings ( metal ) for my dust collection system. Any suggestions?
Any ideas?
Thanks!
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www.grizzly.com
--
Regards,
Doug Miller (alphageek at milmac dot com)
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http://www.google.com/search?hl=en&q=ductwork+for+dust+collection
Several sources.
Max (I used Oneida)
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http://www.ductincorporated.com/companyinfo.htm http://www.blowpipe.com /
Dave Herron wrote:

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http://www.pennstateind.com/store/ductwork.html
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