120mm fan to single brick vent

I designed this to fit into a removed brick from my garage wall - and attach to a 120mm fan.

Rather than make a standard vent sized hole in my garage wall I figured I could just remove one brick.

I intend to design/print a separate grill/vent door to fit into this and tidy up the exterior wall.

(added exterior vent grill)
(added picture of fitted fan in wall)