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Ok, I get you. I'll see if that will work. And foam is ok for the concrete block part, with little or no mortar, so that's good to know, thanks.

That's two unhelpful replies from you. Haven't been on this forum before so don't know if rudeness is the norm. I don't have a photo with me. Just imagine a round 100mm hole going through a concrete block wall, and on on the external side of a cavity, a hole in a redbrick wall that can't be seen...

It is being utilised. Given that it's not authorised by the management company, I want to get rid of it completely.

Got a positive input ventilation unit in the hallway of my apartment. The contractor, or somebody working for him, bored a new 100mm hole out through the gable wall of the apartment building. The wall consists of 44 centimeters of concrete block, and then a cavity, and then red brick. There's no...