Aluminium Square Weather External Louvres

Our aluminium square weather louvres are designed for external wall ventilation openings in both residential and commercial buildings. Engineered with a 45-degree fixed blade and 38mm depth, they provide excellent resistance against rain ingress, wind, and debris while maintaining a high 90% free area for airflow. Bird mesh is fitted as standard to prevent pest and insect entry.

Suitable for both supply and extract applications, our external weather louvres are available in 10 standard sizes from stock, with bespoke made-to-order options available for non-standard openings. In stock with next working day delivery available

What is a weather louvre used for?

A weather louvre is fitted to an external wall opening to allow ventilation air in or out of a building while preventing rain, wind-driven debris, and pests from entering. They're commonly used on plant rooms, commercial buildings, residential walls, and roof spaces where a weatherproof external vent is required.

What sizes are available?

Standard aluminium square weather louvres are available in 10 sizes to suit common wall opening dimensions. If your opening is a non-standard size, we also offer bespoke made-to-measure louvres — contact our team for a quote.

Are these suitable for both supply and extract ventilation?

Yes — the 45-degree fixed blade design and 90% free area make them suitable for both supply (intake) and extract (exhaust) applications.

What is the blade angle and why does it matter?

The 45-degree blade angle is the industry standard for weather louvres — it deflects driving rain downward while still allowing free airflow through the louvre face. A steeper angle provides better weather protection; a shallower angle improves airflow but reduces rain resistance.

Do they come with bird/insect mesh?

Yes — all louvres in this range include bird mesh as standard, providing protection against birds, insects, and larger debris without the need for a separate mesh frame.