Abatement Technologies BULLDOG Series Deluxe Model Negative Air Machine BD2KMATechnologies deliver powerful, efficient HEPA air cleaning with enhanced monitoring features. Offering airflow rates of 1,300 cfm (Low) and 2,000 cfm (High), the BD2KMA includes a differential pressure gauge and audio "change filter" alarm to alert users when filters need replacement. Designed with a rotationally molded, flame retardant polyethylene cabinet, this machine is virtually indestructible, leak tight, and easy to clean. Its three stage