Air throw
Short definitionThe distance the air blown by an evaporator reaches. If it is shorter than the room, a second unit is needed on the opposite wall.
Every evaporator has a throw distance that depends on the diameter and number of its fans. Beyond that distance the air loses velocity, and product in the area it cannot reach does not get cold enough.
In long rooms the answer is either a unit with stronger fans or two units facing each other. High-stacked product and racking block the air path. Throw is worked out for a full room, not an empty one.