Fan

A fan is an object in Bad Piggies and Angry Birds 2 used to blow objects into the air. It affects the trajectory of birds, pigs, objects, etc.

Bad Piggies
It appears in some levels of The Road To El Porkado, they can be used to make Ross and his vehicle go far in the air but it isn't very effective if the player is using a heavy vehicle or the fan isn't near another one.

Angry Birds 2
It appears in most of the Pig City levels and other, it  pushes birds, pigs and objects away on high strength. They can be used to take boss pigs away, structures or boost birds.