Propelling the Links
Air Cannons appear in every Stage, usually in areas where the Links can fall through floors, though they can be used to ascend to higher places. Air Cannons can blast the Links high in the air out of a roof, hole, or into another Cannon. On such occasions, there are usually large Force Gems for the Links to collect. Air Cannons can hold all four Links.
An Air Cannon is present in the fight against Vaati. If any of the Links falls into the holes in the floor, they can use it to return to the arena above. Alternatively, they can just climb the ladders.
- Encyclopedia (Dark Horse Books) pg. 126