For Ventilation Systems

Our standard range of Weatherlouvres are designed for use with ventilation systems, where they offer a good external appearance, free flow of air and excellent weather resistance.

Types and Applications

This is a louvred screen on a rooftop application

A weatherlouvre application

Acoustic Louvre

There are three basic categories, as follows:

Fixed Blade Louvre

This type is primarily used on the external face of a building or duct system where resistance to rain water is required. It has a good aesthetic appearance whilst offering good airflow characteristics.

External Weather Louvres - 50mm Blade Pitch WL-50 fixed blade external louvres represent the smallest architectural louvre profile available in this series and is particularly suitable for smaller projects where a balanced appearance is necessary. The profile of the blade offers good resistance to the penetration of rain whilst maintaining 50% free area. Characteristic continuous line appearance and concealed vertical stacking is available for this series.

External Weather Louvres - 100mm Blade Pitch WL-100 fixed blade external louvres represent the largest architectural louvre profile in this series and is best suited to larger louvre applications. The profile of the blade offers good resistance to rain whilst maintaining a high 50% free area. Characteristic continuous line and concealed vertical stacking is available for this series.

Penthouse Louvres PHL Penthouse louvres are suitable for air intake or discharge over ventilation shafts etc. on flat roofs, and available in WL50, WL75 and WL100 profile sections. The penthouse louvres have continuous mitred corners and an aluminium or galvanised steel gently sloping roof. PHL penthouse louvres offer good resistance to the ingress of rain whilst maintaining 50% free area.
Louvred Doors Doors can be manufactured to fit any aperture in either single or double form, and in 75mm or 100mm format. Door design can also incorporate filters, Acoustic Panels, Control Dampers, etc as specified. Acoustic panel doors - details upon request.

Acoustic Louvres

The Acoustic Louvre is designed to reduce noise from plant rooms, or ventilation system inlets and outlets, whilst offering good external appearance, free flow of air and excellent weather resistance.

They are available with two ranges of acoustic performance: Type AC1 giving 10/15 dB attenuation and Type AC2 giving 20/25 dB attenuation.

Acoustic tests were carried out using a dynamic substitution test method, which involved measuring the noise level of a ducted noise source, both with and without the louvre in place. The difference between the two sets of readings (i.e. the Transmission Loss) is shown in the performance graph.

Aerodynamic tests were carried out using various louvre sizes, and over a range of airflows. the difference in static pressure across the acoustic louvre is shown on the following chart.

The specially designed blade section, ensures that the pressure loss is similar when the louvre is fitted at an inlet, or at an air outlet of a system.

Sandtrap Louvre

This is a fixed blade type weatherlouvre which is specifically designed to remove air carried sand from an air stream and which would usually be used for an air intake to a ventilation system. However, this type of louvre can also be used where high "IP" ratings are required for water or sand ingress.

Type STL Series 2

Used for the filtration airborne sand or screening to plant rooms etc. Suitable for intake/exhaust applications. Insect screens and/or filters be fitted if required. Units are capable of separating to 80% of airborne particles. A horizontal discharge blade is incorporated into each to facilitate clearance of collected debris from the unit. Larger units can be manufactured in the form of modules if required.

 Resistance to Airflow

The graph shows the pressure loss versus face velocity characteristics or each type of weatherlouvre mentioned in this page. Exact pressure loss details can be given upon request.

Constructional Specification

The louvres are constructed with a fully welded 2.5mm thick, zinc coated steel outer casing with integral flanges to facilitate fixing to the builderswork opening or connecting ductwork. The blades are manufactures from 1.6mm thick, zinc coated steel which are welded into the outer casing. The outer flanges are normally supplied undrilled unless other-wise requested.

The acoustic louvres are constructed with a fully welded, 2.5mm thick, zinc-coated steel outer casing, with integral flanges to facilitate fixing to the builders-work opening and connecting duct work. The acoustic blades are manufactured from 1.6mm thick, zinc-coated steel, with heavy density rockfibre acoustic infill being retained in place behind perforated galvanised sheet steel.

The heavy density rockfibre acoustic infill is inert, vermin proof and non-hygroscopic. It has a Class 1 Spread of Flame Certificate, to BS476, part 6. The infill has a mesh scrim facing to prevent fibre erosion.

Alternative materials and methods or construction are available and details will be supplied upon request.

Finish

 All louvre types have a primer paint finish but can also be finish painted if required.

For further information please contact CES at

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141111