ΠΟΡΤΑ ΑΣΦΑΛΕΙΑΣ

https://p4hedpc284.doodlekit.com/blog/entry/5053103/7-things-about-youll-kick-yourself-for-not-knowing

It's been quite a while because we went over security doors, so we believed it was about time for a refresher. Let's start by advising ourselves what they are and why we need them. What is a security door, and