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Projectors are placed on tables or desks for presentations away from the office, when they are used in different rooms in the building or when they are stored away in cupboard for security when not in use.

In situations where the projector is only going to be used in one room, often it is mounted on the ceiling.
When it is installed on the ceiling, it is safe (projectors can be knocked off desks and it is usually fatal) and out of the way; cables are also contained making it safer for people in the room as well as looking nicer. It is also much quicker to get ready for a lesson or presentation: you only have to plug the source in to a wall mounted input plate and turn everything on and you're ready.

Usually projectors are ceiling mounted in classrooms, training rooms and boardrooms because they are used regularly.

Can I mount any projector on the ceiling?

Although the majority of projector can be mounted on the ceiling, not all of them are ceiling mountable.

Some portable and ultra portable projectors are designed to be used on desks only because they are targeted at people who use them on the move (e.g. sales representatives etc.).

Ceiling mountable projectors have screw holes on the bottom that allow them to be fixed to a ceiling bracket and the image can be flipped in the menu so it is the right way up when the projector is mounted upside down.

If you plan to mount your projector on the ceiling, make sure that the model you want can be used that way.

Why does the projector need to be upside down when mounted on the ceiling?

The way a projector projects the image is the reason why it needs to be upside down when mounted on the ceiling.
The illustration below shows how the image is projected when the projector is placed on a desk:

Desktop mounted projector

The image is projected upwards when the projector is the right side up so if it was mounted on the ceiling in this position, the image would hit the ceiling rather than be on the wall below.
Turning the projector upside down solves the problem.

Ceiling mounted projector