Is this normal/acceptable?

Hi guys! Recently got my split system installed and this is the result of it.

The walls are double brick there is now a gaping hole connecting the inside of the house to the outside, making the home less energy efficient.

Would people agree that this is an acceptable install or should the installers have done something more to ensure a better seal? Is there something that I can do to seal this hole? It’s a pretty tight space to get into as you can tell.