Sorry, I wasn't super clear. It's a standard brick facade on a standard brick house. I'll be making an opening 1 cinderblock (yes, CMU) in size (the brick is over cinderblock, except where these vents are at, the cinderblock is missing) for a crawlspace vent. The whole issue is that they bricked over the vent opening, instead of putting a vent in! No idea why - they put the vents in almost all the other openings (except these 2).
So, I basically need to remove the bricks from the opening, and motar the vent in.
Should I forgot about cutting through it, and just chisel is out? See the photos!
I'd guess I chisel at the center motor joint, and work out to the edges?
For the 1/2 brick overhang remaining, I'd get a small motor cutoff wheel, and cut that one...