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A little bit harder than posting about it online but not much! You probably want a cold chisel and hammer. Finding an air brick might be a bit more tricky at the moment.
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Angle grinder with a disc and then sds drill. It will be noisy and messy.
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'Knocking' will mean a lot of making good.
Do you have a decent hammer drill?
Much easier to drill out a series of holes in the mortar
to loosen any complete bricks you can remove.
Half bricks: drill a series of (smallish, say 6mm), holes about 5mm oversize to the air brick,
this should reduce the anount of chiselling you need to do to slide the airbrick into place,
and give give an adequate gap to apply mortar to hold it in place.
Airhead
lynx
mespilus
Bobbo
@Chalfie
How hard is it to knock some bricks out of a bin shed wall and replace it with an air brick?