High score! The outer door is opened inward, and the iron door is added inside

Make a hole in the wooden door to make a small door for ventilation or the door frame is not moving, and the door leaf can be replaced with a small ventilation door, either wooden or iron.

If possible, you can only do iron sliding doors to satisfy you, the door is open and the iron door is closed.

How about making it simple with the door hinge on the other side?

Pull the gates, ventilate and ventilate.