© Email Ventilation 2013
TWL - Total Weather Louvre
Description
The TWL is mainly used for a continuous look louvre. It should be used as a two stage louvre where ventilation is required with the need for high weatherability and/or aesthetic purposes.
Variations
The TWL comes in two sections. The first stage is made up of a one stage louvre (either LV or SLV) attached to a concealed mullion with the extruded louvre (2ELV) rear second stage fastened at rear of mullions. With a depth of 160mm, the TWL is able to be placed in most openings without any overhang.
twl sl  slv with insert.jpg
Ventilation
The TWL is moderate air low ventilation product. Free area of up to 51%, dependant on the height and width of the louvre. Standard pitch is 100mm front blade and 50mm rear.
Specifications
Product shall be Email Ventilation Total Weather Louvre (TWL) in modular or continuous form with horizontal blade installation manufactured from aluminium, Colorbond or zincalume. The front stage comprises of an external “Z” shaped louvre using EA one stage louvre or one stage step louvre blade at 100mm or 90mm pitch. The EA two stage extruded louvre blade (2ELV) will be supported behind the first stage between the mullions at a 50mm pitch for optimal weatherability. Louvres shall be mounted on concealed brackets to provide an unbroken line over the entire length. Concealed supporting mullions will be attached to flashing, jam and sill at maximum 1200mm centres. Depth of the louvre is to be approximately 150mm.
combination of louvres at larapinta good photo.jpg

Weatherability
EA two stage louvres have vertically positioned mullions with horizontal blades. These vertically mounted fixed natural ventilators have been designed to meet the demands of Australian conditions. The two stage louvre employs an effective concept of shaped louvres arranged to achieve optimum air-flow and rain elimination, effectively filtering water from the air. The air passage geometry uses centrifugal force and pressure differentials generated within the ventilator to transfer large drops of water and water film to the subsequent louvre. These, and small air bourne droplets are flung out of the air stream, are collected by and drain from the first and second stage blades.
The front stage increases airflow through the louvre while maintaining weather effectiveness. By itself, this blade gives moderate weatherability, but in heavy downpours (or light rain and heavy wind), the single blade is not sufficient to totally eliminate water being pushed up and through the louvre to the other side. The second stage blade will collect any water that has been pushed through the first blade and cause this water to drain through the blade drain profile to the flashing and out of the system.
long tower with louvres.jpg
System
Material
Aluminium, Colorbond or Zincalume.
Finishes
Mill, anodised, powder coated or Colorbond.
Blade
Front- Extruded, Rear- Extruded.
Profiles
Onestage- LV, SLV.
Joints
At mullion centres, generally at maximum 1200mm.
Clips
Unique clipping system.
Pitch
100mm or 90mm Pitch at front.
Bird / Insect
Optional mesh for bird/insect protection.
Mullions
2mm formed aluminium or zincalume.
Fasteners
Aluminium, galvanised or stainless steel.
Blanking Panels
Optional extra with or without insulation.
Maintenance
Little or no maintenance required















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