Fixed Box Louvre

White Painted Aluminium Fixed Blade Natural Ventilation Louvres installed into a factory building in Yorkshire


A range of fixed blade louvres designed to act as a ventilation source either for inlet air or exhaust. Individual units contain louvre blades which are mounted into robust box frames. Offered as single units or alternatively they may be joined together to form banks of unlimited height and width.

All units are suitable for mounting into cladding, glazing and brickwork with flanges formed to suit any mounting detail.


A range of factory assembled exterior weather louvres, offered with a range of blade configurations to suit aesthetic, functional and weathering requirements. All units suitable for vertical mounting in sheeting, glazing and brickwork.

Can be manufactured from the same material as adjacent metal cladding to give a colour and finish match.


Offering characteristics of most single bank louvre systems Fixed Box Louvres are suitable for use in most general applications.

Weights and Free Areas

Dependant upon blade configuration, generally 15-20kg/m² and 45-50% free area.

Shapes & Sizes

Due to the made-to-messure nature of these louvres together with a wide range of louvre blade sections the units are available in an almost unlimited range of shapes and sizes including circular, triangular, semi-circular etc.,

Standard louvre blade pitches include 112mm, 90mm & 65mm. Louvre blade spacings can be varied to suit to provide a uniform appearance.

Aerodynamic Testing

The unit was subjected to a series of independently controlled tests to determine the aerodynamic performance of the design.

Aerodynamic co-efficient – 0.298

Materials & Finishes

Offered in a wide variety of materials to include aluminium & steel, either in mill finish or post coated. Also available manufactured using pre-coated materials.

Aluminium alloy units in aluminium sheet to BS EN 485 or aluminium extrusions to 6063 T6 supplied in either mill finish or with a polyester powder paint finish (including Syntha Pulvin) with a wide choice of colours and gloss levels.

Steel units manufactured using Corten or galvanised steel in mill finish or with a polyester powder paint finish.

Pre-coated units manufactured using Plastisol, PVDf or Colorcoat coated substrates in a full range of colours.

Also available using stainless steel, zinc, copper or bronze sheet materials.

Manufacturing Options

  1. Top, bottom and side flanges may be formed to whatever mounting detail is required.
  2. With flanged louvres, the box depth can be manufactured to fit inside or outside the building line as required.
  3. Expanded metal bird guards, security guards or fly mesh can be fitted internally or externally as required.
  4. Where units are to be mounted in continuous horizontal runs, joining plates are supplied.


Maintenance should be carried out in accordance with McKenzie-Martin’s recommendations.

System Design & Product Selection

Assistance with scheme design and product selection is offered by our experienced technical team.