The HEPA Head carpet attachment is activated by the movement of air being drawn through the head of the carpet cleaner. When the vacuum is turned on it causes the beater bar and brushes to revolve and pick up the dirt at the same time. Because there is no electric motor there is no need for an additional electrical cord to get in the way. Meets EPA requirement for lead paint removal work. Beater bar is powered by air from the vacuum. Meets EPA RRP requirements for lead abatement. For use with Dustless vacuums. Dimensions: 12 L x 4 H x 8 W.