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I want to increase a bathroom vent duct from 3" to 4". The duct exits the wall of my house which is stone. How should I go about enlarging the hole?
 

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For the stone portion of the wall:
They do make a 4" diamond core drill. However a 4" core drill thru a stone wall is not a hand operation. The drill would need to be fixtured or mounted. Might want to check w/ your local tool rental center for options. If no options, drill small holes around the 4'' circumference and chip away.
 

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mounting a core drill & stand on a vert wall's not for the uninitiated impo,,, the small drilled holes make much more sense for the avg diy'er :thumbsup:
 
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