1. For seating capacities up to 200:
- The screen width should not exceed 0.22 times the seating distance from the rear wall to the front row of seats.
- The screen height should be between 0.095 and 0.125 times the seating distance.
2. For seating capacities greater than 200:
- The screen width should not exceed 0.2 times the seating distance.
- The screen height should not be less than 0.125 times the seating distance.
Note that these NBC guidelines provide minimum requirements, and movie theaters can choose to have larger screens based on their desired presentation and audience experience. Other factors, such as the type of movie, the projector used, and the aspect ratio of the film, can also influence the appropriate screen size.