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Drilling 4" hole through concrete

To: shop talk <shop-talk@autox.team.net>
Subject: Drilling 4" hole through concrete
From: Justin Bedard <juice@lerch.org>
Date: Tue, 23 Dec 2003 12:48:14 -0500
Hello,

With the time off that accompanies the holidays I'm looking to get a 
couple of projects done.  First on my list is to properly vent my 
clothes dryer.  I thinking of possibly running an additional length of 
hose and filter to my garage to help warm it a little (at least when the 
dryer is running!).  My question is: what's the best way to drill a 4" 
hole through concrete?  Can it be done w/ a hammer drill + lots of 
smaller holes + chisel?  The house was built in 1920 so it's that old 
concrete foundation where there top layer easily crumbles.  Or is it 
best not to drill a 4" hole through this kind of concrete?  Or if I do 
drill a hole that big, should I reinforce it with something?

Thanks,
Justin





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