The Smart Vent prevents foreign bodies entering the chimney and is designed to increase updraught and reduce downdraught. The closed upper surface of the terminal impedes the downward movement of wind which might otherwise create a down draught within the chimney. The curved shape of the four vertical walls behaves like an aerofoil which creates a negative pressure on the inner curved edge as wind passes over and through the Terminal. This action creates a suction to increase the upward chimney draught.
Smart Vent is a Universal Fixing Cowl which is suitable for use with both Chimney Pots and Terminals. The method of fixing is by means of "claws", which when secured against the inside wall of the terminal by way of tightening the connected threaded rods grip the inside of the pot and secure the Cowl to it.