Regarding the civil defense requirement ,what is the direction of emergency door opening in escape stairs?

The usual requirements of the Civil Defense safety door opening direction is designed or give free open area with short distance and accessible Door space with emergency Push-on opening from the inside to land a safe passage. 

The direction of the emergency door should be push type for one to easily get in safe area

The direction of emergency door must swing out in the direction of exit i.e.escape stairs.

in direction to inside building due to escape stairs have pressure fresh air