With controlled air leakage, Air casters create a wafer-thin air film between the floor and the object to be moved. This floats the object and allows it to move freely. So free that when the air film is created the object “starts to float away” when the floor is not completely flat.
Moving heavy loads with Air casters can easily be done in a safe way, but certain precautions are necessary when moving heavy items. This is no different from heavy displacement with other techniques, such as heavy transport on wheels, by rail or with a crane. But these techniques are often limited in freedom of movement, whereas Air casters can move any item freely once it is floating on air. This is possible with smaller weights, in a controlled way, by hand. For larger weights a drive is necessary. This external drive is not so much needed to get the mass moving, but mainly to control the mass. Safety is of course paramount.