92 diagonal 169 pull down screen self locking mechanism dual wall and ceiling mountable high quality screen materials pwc projection screens are popular because they are inexpensive and easy to operate optoma manual screens offer several outstanding features they come in two different sizes 92rdquo 169 format and 84 43 format to meet most projection requirements construction optomarsquos matte white fabric is composed of 4 different layers including a sheet of weaved fibre glass