"Green" aluminium isn't about the metal itself because aluminium is always the same element, but how it is made.

Free area is a rough proxy, while actual performance is governed by pressure loss.

If you need airflow and weather protection, drainable louvres are designed to manage wind-driven rain by capturing and directing water away.

A single-stage drainable louvre relies on a single line of defence, whereas a multi-stage drainable louvre adds extra layers of rain defence.

The short answer is yes. Ventuer provides a range of economic and effective screening louvres such as the VL-50CM, VL-100CM, VL-70S, VL-55S.

It's not always straightforward as ventilation louvres are an intentional opening, however compliance is achieved through water management rather than complete watertightness.

In a storm the rain doesn't fall straight down, it comes in sideways. That's why blade shape and spacing are important.

Our louvres vary in size and weight, find the default 1m² reference chart here.

A drainable louvre is designed to manage wind-driven rain by capturing water and safely draining it away from the building.

A standard ventilation louvre is designed to move air efficiently, but acoustically it's effectively transparent. An acoustic louvre is specifically designed to do both, but with some trade-offs.

The Ventüer louvre calculator does account for the pressure loss created by secondary support members, including dead blades and other inactive areas.