There is a wide variety of screens each one with a choice of projection surfaces. Selecting the right combination to meet your needs is important for optimum results.
The following is a guideline for selecting a screen that suits your application. Although these recommendations will work in most situations, each must be looked at not as a strict rule, but rather as a guideline for determine your actual needs based on your own situation.
Pick the type screen that best suits your particular needs. For example, choose form front projection or rear projection screens in either potable, wall or ceiling mounted models in either manual or electric versions. Generally, if your projection application is permanent, then wall and ceiling screens are your best choice. If, however, you find your needs require moving the screen to different locations then a portable screen is a better alternative.
Determine the optimum screen size based on room dimensions, planned audience seating size and arrangement. The rule of thumb is to fit the screen to the audience-not to the projector.
I recommend the following formula for determining screen size: