What size air mover you need depends on the size of the area, the type of drying, and how much airflow you require. For home use, small carpet dryers with 1/4 to 1/3 horsepower and 2000 to 3000 CFM are sufficient for drying a small bedroom, bathroom, or garage. These compact units are lightweight, low-profile, and easy to store. For larger living rooms, basements, or water damage restoration, a standard 1/2 to 1 HP air mover that produces 3000 to 4000 CFM is the most common choice used by professionals. For large commercial spaces, warehouses, or severe flooding, high-velocity axial air movers or large 1 HP plus units that move 4000 to 6000 CFM are needed. A general rule from the IICRC is one air mover per 150 to 300 square feet for water damage drying, plus one for each affected wall. You should also consider amp draw if you have limited circuits, with smaller units drawing 2 to 3 amps and larger units drawing 7 to 10 amps. If you are buying for occasional home use, a mid-size 1/2 HP unit around 3000 CFM is the best versatile size, powerful enough to dry floors and carpets but still portable and able to run on a standard household outlet without tripping breakers.
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