What is the difference between a residential system and a public / light commercial* system?
The door operators in these two systems operate identically when triggered by remote control. They will open, pause for entry or exit, then close the door. The difference is in manual operation. In a residential system (using the Model 133), the door is free-swinging when manually opened. With a public/light commercial system (using the Model 233), the door acts like it has a spring door closer on it when it is manually opened. This is similar in action to what might be found in commercial restroom doors. The door resists opening slightly, and when the door is released, it closes behind you automatically.