This Dri-Eaz air mover will ventilate confined spaces through up to 125 feet of Sto and Go ducting. The Vortex uses a 12 inch axial fan blade to pull musty air out or propel fresh air in to inaccessible areas. Its also an ideal choice for drying large open areas like gyms, concrete pads, hallways, etc. Has a powerful 1.0 HP motor and a built-in handle. Stackable for storage! Operate standalone or with Sto and Go ducting.