Close the shutter if it is not already in the closed position. If an attic fan is currently running, turn the fan off to ensure that the shutter stays shut.
Place a ladder under the ceiling shutter you want to cover.
Measure the width and height of the shutter. Use the measurement to find the appropriate-sized shutter cover.
Position the shutter cover over the shutter so it is fully covered. If the cover comes with a hook, hook it to the shutter.
Peel off the backing of the adhesive that comes with the cover. Make sure the ends of the cover are lined up with the edges of the shutter and firmly press down to apply the adhesive.
Repeat these steps for each additional shutter. Slowly unhook and peel off shutter covers when you need to use the fan ventilation system.