The closest thing I can think to call this thing is a sprite sheet, since I plan to cut it apart and use the individual pieces for backgrounds, that's why I've done the pipes the way I have, so they can be mixed and matched in order to make whatever plumbing thing seems appropriate for the scene. And to think I was only gonna draw a few outlets and a fire sprinkler when I started.
I'm not really sure as I've been making it up as I go, if I remember right the first aid and fire alarm sign are one centimeter wide and two and a half long. Not sure if that helps figure out the scale or not.
Also is there anything on there you can't figure out what is?