We tough of that idea before but the landlord doesn't let me modify the walls.

There is a garage door which is like 14ft long x 8ft high.

It is the façade of the warehouse so I cannot do anything crazy. The new idea is to cut small square on the garage door (wood made) and stick the exhaust antmzner trough there.

We need to install a drainable louver to cover the garage door from outside. Something like this.
https://m.grainger.com/mobile/product/DAYTON-Drainable-Louver-5NKK0
or like this
https://www.herculeslouvers.com/wp-content/uploads/2015/09/louvered_screening_06.jpg

We are planing to leave about 2 feet from the garage door to the louver cover.

I wonder if it will be enough space for the hot air to go away and pass trough the louver.