Metal Garage Ventilation
There are also exchanger type air inlets.
What they do is take in outside air, pass it over a heat exchanger if sorts that has the inside air passing through it.
What it does is if the air in the room is cool but the outside air is hot, it cools the hot incoming air using the cooler inside air leaving the building.
If the inside air is warmer than the outside air it heats up the cold incoming air using the warmer inside air leaving the building.
It is an air to air heat exchanger.
Don't know but a length of duct could make a gable hole ground level.
There are also exchanger type air inlets.
What they do is take in outside air, pass it over a heat exchanger if sorts that has the inside air passing through it.
What it does is if the air in the room is cool but the outside air is hot, it cools the hot incoming air using the cooler inside air leaving the building.
If the inside air is warmer than the outside air it heats up the cold incoming air using the warmer inside air leaving the building.
It is an air to air heat exchanger.