Because the project was a pool and spa, there's two of many things. Also, the equipment room was on pool/spa level with access through the roof to another level.
A view outside equipment room via the door.
Shown above is the chem controller, the brains of the chemical balance. Black boxes below are the chemical feeders (acid and chlorine).
Lots of signage on a pool/spa project. These are on the outside of the equipment room.