Self cleaning, non overloading wheel Engineered for quiet continuous operation making it perfect for general purpose ventillation Low profile construction simplifies installation in those tight spaces Built with a well balanced backward-curved motor impeller assembly that matches well with the housing to maximize airflow, efficiency and minimize the noise level Formed and tooled by quality deep-stretch cold rolling steel Suitable for use in high-rise condominium, office buildings, schools, boardrooms or where high volume quite ventilation is required Available for 4”, 5” and 6” duct sizes Mounting brackets are included.