At 12:48 PM 12/23/2003 -0500, Justin Bedard wrote:
>My question is: what's the best way to drill a 4" hole through concrete?
Everyone else seemed to answer a bunch of questions you didn't ask, so I'll
answer the one you did. The best way would be to go to a good industrial
tool rental place and rent a core drill. It's like a hole saw on
steroids. It has it's own motor and tripod, all you need to add is power
and water. Rebar and the reinforcing aggregate won't be a problem; the
diamond edged cutter will cut through them just like butter. When you are
finished you'll have a perfect hole with practically polished sides, a nice
concrete core that will make a good door stop, and a big puddle of water
full of concrete dust. If you hire a concrete cutting company, that's
exactly what they will do, too.
As for humidity and excess duct length, the other guys had some real good
advice. I'd listen to it.
Dave C
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