In the previous article we explained why modern aluminium shutters outperform their wooden counterparts. But there is a "superpower" that makes the shutter absolutely stand out from a simple roller shutter, and that is managing light and air without having to open the window.
This superpower lies in the louvres - the horizontal profiles that fill the shutter leaf. The big dilemma: will you choose the classic fixed louvres or upgrade to movable (rotating) louvres?
As the name suggests, fixed louvres are "pinned" (clipped) into the shutter frame at a specific, permanent angle (usually tilted downward). This is the classic design found on traditional "French" shutters and island houses.
If you are restoring a listed building or building a house with a strictly traditional architecture, fixed oval louvres provide the most authentic visual result. They are the choice mandated by local planning regulations in many heritage settlements.
Because there is no rotation mechanism, lever or gear, there is absolutely nothing that can break, jam or wear out over time. 100% reliability.
They are the most economical option in shutter construction, as they require no additional mechanisms or connecting rods.
The air and light that enter are fixed - they don't change. If you want more light, your only option is to open the shutter fully, losing privacy and security. Also, the small gap between fixed louvres makes cleaning rather time-consuming.
This is the pinnacle of modern comfort. The louvres are connected by a hidden mechanism (connecting rod). Through a discreet lever or rotary switch, you can rotate the louvres from fully closed (0°) to fully open (90° or beyond).
Hot August afternoon? Close the shutter to block the sun, but open the louvres to 45°. Hot air rises and escapes from the upper louvres while fresh, shaded air enters from below. You create an air current without the sun hitting the house!
Want to sleep with the balcony door open (screen only) for a breeze? Lock the shutter normally. The house is impregnable. Then open the louvres - you can see out and breathe fresh air, but nobody can see inside.
Instead of a roller shutter's total blackout, movable louvres work like sturdy Venetian blinds. Adjust the light to exactly the level you want: watch TV without glare, read a book in soft diffused light, or achieve full darkness.
Turn the lever so the louvres become completely flat or vertical and wipe them with a damp cloth easily on both sides in seconds. No more "digging" between narrow fixed louvres.
The operating principle relies on natural convection: hot air rises, cool air descends.
With the louvres at 45°, warm indoor air "escapes" through the upper gaps while fresh, shaded air enters through the lower ones. You reduce the indoor temperature by 3-5°C without air conditioning - purely through natural air circulation.
At night, open the louvres almost fully (80-90°) for maximum airflow. The shutter stays locked (for security), the insect screen keeps mosquitoes out and the night air cools the masonry - which stores that coolness for the next morning.
In winter, open the louvres fully on sunny days to take advantage of passive solar heating. At night, close them tightly (0°) for maximum thermal insulation.
If you decide to invest in shutters with movable louvres, there is one golden rule: Never compromise on the quality of the rotation mechanism.
Very cheap plastic clips polymerise ("burn") in the Greek sun within 3-5 years and snap, leaving the louvres dangling uncontrollably.
Choose systems with mechanisms made from specialised heavy-duty polyamide or aluminium alloy (Zamak), which last decades of hard use. They are unaffected by UV radiation or salt spray.
💡 Summary: While fixed louvres offer charm and simplicity, movable louvres transform the shutter into a "smart", bioclimatic tool that dramatically upgrades your quality of life. The slightly higher cost is recouped through lower air-conditioning bills and everyday comfort.
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