How many air movers per room?

How many air movers per room you need depends on the purpose, whether it is general ventilation or water damage restoration. For water damage drying, the IICRC S500 standard provides specific guidance that professionals follow. The general rule is one air mover for every 150 to 300 square feet of affected floor area, plus additional units for walls. For a small bedroom of 100 to 150 square feet with wet carpet, you typically need one air mover. For a living room of 300 square feet, you need two air movers. For a large open basement of 600 square feet that is flooded, you need three to four air movers positioned to create a vortex of air movement. You should also place one air mover every 10 to 15 linear feet along wet walls, angled at 45 degrees to create airflow across walls and floors simultaneously. For non-water damage use like cooling or ventilating a room, one air mover is usually sufficient for a standard room up to 400 square feet because they move so much air. Using too many air movers on one circuit can trip breakers, since each unit draws 2 to 10 amps, so you may need to distribute them across different outlets and circuits. For severe damage with saturated walls and high humidity, you may need more than the minimum to achieve rapid evaporation within 24 to 48 hours to prevent mold.