unless you have access to a water-cooled diamond core drill best way is a chisel and a 5lb hammer. After you have the hole push the vent in from the outside and fill the gaps with foam in insulation.
Possible solution: Rent a hammer drill, mark circle and drill holes on circumference, then utilize a regular hammer and chisel to create opening.
To heavy a hammer may cause wall to vibrate and crack mortar joints.
TheHomeRemodler.
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