A projector's throw ratio determines how far it has to be placed from the screen . It’s important to make sure your projector will fill the screen from its intended position. You can use the unit’s ...

So, if you have a screen that is 2.6m wide and a projector with a throw ratio of 1.3 you'll need to put the projector 3.38m away from the screen. As well as the size of the screen, consider the type.