I see 4020s everywhere. I probably see them more than I see any other panel. on almost a daily basis.
My Simplex office has a 4020 from what I’m told, however, I seem to remember something about a 4010. The original system was an MXL-IQ before Simplex bought the building. Now the MXL-IQ is hung up on our “wall of panels” for training, along with a 4100U, a 2120, 4100 classic, 4005, 4010, a VESDA system, and a Powerpath unit.
our office doesn’t have any smoke or heat detectors, just pull stations. there might be duct detectors, but I don’t think they have those either. so just pull stations and sprinkler flow switches.