Edge Channels
Even though I risked being called a weirdo by my colleagues, I couldn't pass up the opportunity to try to learn more about the 5" wide edge channels that are sometimes required on fire-rated wood doors with concealed vertical rod exit devices. When these channels show up on the jobsite without warning, architects tend to be less than pleased. The interesting thing about these doors is that although they have the channels and fire exit hardware, there are no visible labels on the doors or frames. It's possible that the door label is on top, although the concealed closer channels take up most of the real estate up there. We explored ways to check the top of these super-tall doors, but it will have to remain a mystery unless we can sweet-talk our way onto the lift they use to change the lightbulbs.
