Advice on how to drill 4" hole!!

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RKB said:
I need to drill a hole for an extractr fan in an upstairs bathroom. Can I deill from inside through the iner block and exterior brick skins? Will this casue excessive breakout damage to the external brick skin?
Ta

No, just dont use hammer action, you must use a diamond core drill though, anything else will either not be up to the job, or dangerous.
 
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