How big of an air mover do I need?

How big of an air mover you need depends on the area you want to dry or ventilate and the severity of moisture. For a small bathroom, closet, or small bedroom under 150 square feet, a small compact air mover with 1/4 to 1/3 horsepower that moves 1500 to 2500 CFM is sufficient and easier to maneuver in tight spaces. For a standard living room, bedroom, or basement area of 150 to 400 square feet, a medium 1/2 horsepower air mover that moves 2500 to 3500 CFM is the most versatile and commonly used size. For large open areas over 400 square feet, garages, or significant water damage with saturated carpets and walls, you need a large 3/4 to 1 horsepower unit that moves 3500 to 6000 CFM, or multiple medium units working together. In water damage restoration, the industry standard is one air mover per 150 to 300 square feet, so a 600 square foot basement would need 2 to 4 units regardless of size. Also consider physical size and weight, small units weigh 15 to 20 pounds and are highly portable, while large units weigh 30 to 50 pounds. For home owners buying one unit for occasional use, a mid-size 1/2 horsepower centrifugal air mover around 3000 CFM is usually the best compromise between power, size, and ability to run on a standard 15 amp household circuit without tripping breakers.