It's been quite a while considering that we talked about security doors, so we thought it was due time for a refresher. Let's start by reminding ourselves what they are and why we need them. What is a security door, and why do we need them…

It's been a long time because we talked about security doors, so we thought it was high time for a refresher. Let's begin by reminding ourselves what they are and why we need them. What is a security door, and why do we need them? Put simp…

It's been a long time considering that we went over security doors, so we thought 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 need them? Simp…