The viewable surface area of a 123 inch diagonal UST ALR (Ambient Light Rejecting) projection screen will measure approximately 107.2 inches wide and 60.3 inches high. The ideal viewing distance from your eyes while seated to the screen’s surface is within the range of 12.3 to 18.5 feet depending on the types of content you watch and how immersive you want the viewing experience to be.
123″ Lenticular “Cinematic” Wall-Mount Fixed-Frame UST ALR Screen

The Elite Screens AR123H-CLR 123″ Aeon Edge Free CLR Series lenticular projection screen features StarBright CLR material with a 0.6 gain, 95% ceiling ambient light rejection, and a 180° viewing angle. Frame bezel 0.4″. After assembly, the screen dimensions are 107.4″ wide, 60.8″ high, 1.3″ deep, and it weighs 26 pounds. LED backlight kit included. Buy at Amazon.com.
see also
Elite Screens Aeon CLR® Series – CLR Fixed Frame Screen | Assembly & Installation | M Type Version
How to Properly Unpack or Unroll Elite Screens Ceiling Ambient Light Rejecting CLR® Materials

The Elite Screens AR123H-CLR3 123″ Aeon Edge Free CLR 3 Series lenticular projection screen features CLR3 material with 0.8 gain, 90% ceiling ambient light rejection, and a 170° viewing angle. Frame bezel 0.4″. After assembly, screen’s dimensions are 107.4″ wide, 60.8″ high, 1.3″ deep, and it weighs 24 pounds. LED backlight kit included. Buy at Amazon.com.
see also
EBPMan Reviews Elite Screens Aeon CLR® 3 Series – Ambient Ceiling Light Rejecting Fixed Frame Screen

The Akia Screens (subsidiary of Elite Screens) AK-NB123H-CLR4 123″ Edge Free CLR 4 Series lenticular projection screen uses CLR 4 material with 0.8 gain, 90% ceiling ambient light rejection, and 170° viewing angle. Frame bezel is 0.4″. After assembly, the screen dimensions are 107.4″ wide, 60.8″ high, 1.3″ deep, and it weighs 24 pounds. OPTIONAL LED backlighting kit is NOT INCLUDED! Buy at Amazon.com or directly from Akia Screens.
