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

It's been quite a while since we discussed security doors, so we thought it was high time for a refresher. Let's start by advising ourselves what they are and why we require them. What is a security door, and why do we require them? Put si…