Aluminium window slider frame track

Hello All,
Just received three aluminium slider windows.
While installing noticed the fixed and moving panel there is a 20mm opening on the bottom and top. If you look directly you can see outside.
The top is so the panels can be removed but still air can come in.
See photos which may explain it better.

Yes, it obviously can.

Thanks for your reply.
Is this a design problem or something missing?

To me it looks like all sliding windows must have a small gap in order to allow the sliding window to slide without scraping the track on the fixed window, but it also looks like they cut into that lip way too much. Personally, I would ask them to fix it by re-doing that one frame bar and then reassembling the window, and perhaps fit a brush where the tiny remaining gap exists. If they won’t do it, I would seek assistance from the Australian Window Association (AWS) or Fair Trading in your State. Heat and cold will just pour in through a gap that large, and it’s just not acceptable.

You didn’t happen to go with the lowest quote from a company out of a local newspaper ad?

Thanks for the reply.
I have been told there is a cap that blocks the area.
Agree it seems to be extremely big.

Another question
The lock on the moving window panel the outer frame touches the fixed frame when fully closed. Is this normal on a sliding window? See picture
Concern overtime the lock assembly will be damaged.

Which window company?

A company in Sydney

You're not helping yourself