Room dimensions are critical in ensuring correct projection screen size is selected.
Ceiling height is the most important dimension. (standard domestic ceiling height approx 240cm standard business ceiling height approx 300cm)
Correct position for comfortable viewing of a projection screen is approx 100cm from the floor to the bottom of the Viewing Area (white section)
For home cinema installation this would be slightly lower approx 80 – 90cm from the floor to the bottom of the Viewing Area (white section)