The CS Circulation Fan was designed to work in an encapsulated crawl space. Use this fan in a moisture management plan to make the Compact Air Plus dehumidifier more effective. This fan will assist in moving the crawl space air toward the dehumidifier allowing it to remove more water even faster, thus saving you money. It runs on standard household outlet and is rated at 200 CFM (cubic feet per minute). As part of a moisture management plan a few of these fans can extent the Compact Air Plus dehumidification capabilities to 3500 sq ft at 4' tall.