An air mover is the low-profile, high-velocity fan restoration crews place against wet floors and walls. Its job is targeted: move a fast sheet of air across a wet surface so moisture evaporates off the material and into the air much faster than it would on its own.
What an air mover does not do is remove water. Evaporation just relocates moisture from the carpet into the room's air — and if that humid air has nowhere to go, it re-condenses on cool surfaces, which can spread a problem instead of solving it. That's why professional drying setups pair air movers with dehumidifiers sized to the space, and why a rented fan pointed at a wet wall for a week is not the same thing as structural drying.
Placement is the craft: angle to the surface, spacing along walls, airflow direction around corners, and adjustments as materials dry. Crews balance the count of air movers against dehumidification capacity — a psychrometric calculation, not a guess — and verify progress daily with moisture readings rather than by feel.
On an estimate, air movers usually appear as per-unit, per-day line items alongside dehumidifiers. Seeing both together is normal and correct; seeing many fans with no dehumidification is a question worth asking.