There's a glass block window in my basement that has a 22x8 vent in it. The vent is opened or closed by a crank that operates two glass panes. This is common in older glass block windows. However it is very leaky, and the mechanism becomes useless soon, leaving the glass frozen in a slightly open position.
Newer windows have a hopper vent, which has double-pane glass and a simple hinge mechanism, which seals better and lasts longer.
If I had a 22x8 hopper vent, I'd gut the old vent, leaving the aluminum frame in place, because it is screwed to the glass blocks from the inside (how this is done I can't imagine). Then using suitable wood blocks, I'd create mounting points for the new vent mechanism.
However it appears that vents are available only in 16x8. What then is a good way to do this? Even replacing the vent with glass blocks would be difficult, because it would involve removing the frame. Thanks.