What is the effect of opening the security door in the home outward or inward?

There is no Feng Shui influence, just safety considerations.

First, when there are bad guys who want to force in, if it is opened outward, the lock must be destroyed, and now the anti-theft door is quite good in this regard, so it takes time, and the bad guy has time, then you will have time to ask for help. If it is open inward, then if the force is high, it can be rammed in a very short time.

Second, there is such a situation after the occurrence of various earthquakes, when the door is opened inward, then if the wall is deformed, it is difficult to open it by the handle and the back pull of the person alone, and if the outer door opens the lock, the person can force it open.

I don't know about Feng Shui. But there are security implications.

If the security door is not locked, rely on the small tongue to lock the door. Whereas, the inner door bevel is outward. If it is a crack in the door, there is no corner of the security door. It is easy for thieves to use inserts to unlock the lock from the outside, just like the secret lock of the ID card in the past.

Yes, it is generally opened outwards for fire safety considerations. Because in the event of a fire, the door must be pushed open and not opened for the fastest possible evacuation.