Ruskin Model ABD-SEA provides precise and automatic airflow regulation for supply or exhaust ventilation systems in any residential or commercial building. Use in any HVAC application, with a static pressure between 0.2 and 2.0 inches w.c. Facilitates controlled volume of make-up or exhaust air in highrise applications. The ABDSEA is factory supplied with a 6" (152) 24 gauge plenum/enclosure box and an aluminum supply or return grille.