Dayton ceiling shutters are sung fit onto the ceiling opening for use with whole house fans. These shutters feature aluminium blades with a delt seal on the leading edge for quiet operation and have tie rods on each end to assure a uniform opening when positive air pressure is applied to properly ventilate the facility. They have galvanised steel construction and come with pre-punched mounting holes for ease in installation. Choose from an extensive range of these ceiling truss shutters, available in 32, 35, 42 and 43 inch lengths.