The calculator defaults to the middle of the zoom range. If you move the slider that you circled, it changes the screen size. If you notice there is a slider in the top left as well. That is the one you can move that does not impact screen size.
So, if your goal is a 135" screen, you have a range between 13'8" to 21'10" that the projector may be mounted between.
That distance is LENS TO SCREEN.
I'm not a fan of ceiling fans in theaters, because they add noise and you absolutely may not have their cruddy lights on while the film is playing. If you are planning properly, you want to ensure you get lighting right in the space with at least one row of directional lighting over the seating area on dimmers. NOT LED LIGHTS! They don't actually get dim enough on dimmers.
I would also strongly recommend the UHD65 over the UHD60 as it adds a 6x color wheel and has much better contrast and color saturation.
- Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.