Tight sealing shutters that can easily be manipulated by an electric actuator to create a
    fresh air intake.
    *Shutters remains tightly sealed when in closed position.
    *Shutter opwning is not affected by the weight of dust desposited on the shutter blades.
    *Trouble free automation.
    *Available in different sizes.

    Provides a controllable air entry passage when low ventilation rates are required.
    *Constructed from durable non corrosive materials.
    *Safety mesh for preventing wild bird entry incorporated.
    *Easy installation.
    *available in different sizes.