Truck-mounted units generate a better level of airflow; our units are powered by a large fan, which creates over 10,000 cubic feet per minute of airflow. Our hoses are between 8 to 10 inches in diameter, in comparison to a normal vacuum hose, which is between 1.2 and 2 inches in diameter. Our higher level of airflow allows us superior suction throughout your ductwork to provide a more thorough cleaning. Portable units cannot provide the same level of airflow that our truck-mounted units do.