Hi! I have made a round hole (about 30 cm in diameter) in concrete blocks for a fan. The frame's mounting surface is quite limited, which means I have to mount the fan a couple of cm into the concrete, from the hole perspective, at 4 points. What's best? Should I dare to use screws and plugs, or is there a big risk that the concrete will crack so close to the edge? Another idea is to glue it, which means it will stay put (for better or worse).
Does anyone have any tips?
Does anyone have any tips?