Abstract: A vent cover plate system for the register of a ventilation system that securely and snugly fits over the register thereby blocking the flow of air from that register. The vent cover plate is releasably attached to the register by hook and loop fastening material, magnetic material and mixtures thereof, and can include a rectangular strip of rubber tubing insulation to provide an air tight seal. The vent cover plate system allows for the localized and selective control of airflow in a room or building. Therefore, the specific ventilation requirements of a room or building can be readily achieved.