Hi all, Apologies as this is my second post today about air vents. This time it is a different vent, so I thought I should start a different thread as it is a different problem. Apologies if I should have just continued in first. So, above the kitchen door was a old air vent. I've just smashed it off as wanting to plaster over it flat. But there is some concrete that protrudes from the wall surface (was from the other side of door I assume when that vent was removed and someone piled concrete in to fill). See pics. Now, obviously I have to take off the protruding bit so its flush ready to plaster. The only way I can think of doing this was to use a angle grinder to create hatches and then chisel it out. Has anyone got any better ideas? As this will make an absolute utter mess when angle grinding it, clouds of dust everywhere! Thought I would ask if anyone had any bright ideas how to get it flush? Cheers again, again.