System 23

Louvre system

Metal Technology's System 23 Louvre system has been developed with the intent of providing a pleasing aesthetic appearance at the same time as providing natural ventilation, controlling light and preventing water ingress. Designed with a choice of frame options, the fabricated louvre panels can be glazed directly into the structure or within other Metal Technology systems. The system offers both 33.3mm and 50mm pitched louvre blades with the additional option of a fly screen or bird mesh depending on the application. The louvre panels can also be provided with an insulated backing to suit mechanical ventilation systems. Metal Technology can design various other profiles which can be incorporated allowing the architects to achieve flexible designs. Metal Technology’s louvre systems are complementary to all their other Metal Technology Systems offering the designer complete versatility

Performance Overview

Weather Performance

Within System 23, the P33 and P50 Louvres have been independently weather tested at BSRIA to EN 13030 and are capable of achieving the following results:

P33 Water Resistance Up to Class A
P50 Water Resistance Up to Class A


Geometric/Physical free area:



Without Mesh







Aluminium profiles are extruded from aluminium alloy 6060T6, T5 or T4 complying with the recommendations of BS EN 12020-2 / BS EN 755 Parts 1 to 9.


The outer frame members are mitre cut at 45°. The corners are then reinforced with extruded aluminium cleats and a secure joint is formed by crimping into the extruded cleat. Intermediate mullion bars are square cut and fixed securely to the frame with stainless steel screws. All frame joints are sealed during construction against entry of water using a suitable sealant/adhesive. The louvre blades are supported and retained at each end and at mullion positions by louvre carrier sections that slide into position. Louvre blades clip onto the carriers and are self-spacing to give a regular pitch. Infill louvre blades are also provided at the head of the louvre frame to achieve non-modular louvre heights. If required, an additional drainage section with stop ends can be fixed to the cill of the frame. Metal Technology recommends that only A2 or A4 austenitic stainless steel fixing screws are used in the assembly of their products.


The range of sections can be provided in either of the following ranges of finishes:

  1. Anodised to BS 1615 or BS 3987 or BS EN 12373-1
  2. Powder organic coated to BS 6496 or BS EN 12206-1

Metal Technology's powder coating is produced to Qualicoat standards.

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