Detail Of High quality Aluminium Venetian blind Composition : Aluminium Slat Width : 25mm Available Widths : 26.5cm to 310cm Available Drops/Length : 30cm to 400cm Advantages Of Blind Blinds of this kind provide excellent insulation. In the winter the warm air flows into the room, so the concave sides of the slats should face inwards. While in the summer the warm air is directed upwards, so the concave face of the slats should face outwards. These blinds can be raised and adjusted by the mechanism in the top rail.