The frame is made of Hot-Dip galvanized steel profiles (a design by INTERKLIMA), externally powder coated and enamel baked with RAL 9002 at 50-70 micro. It is incorporates a special rubber gasket that forms a THERMAL BARRIER (a full peripheral rubber thermal break to ensure that no metal bridge occurs from any internal to external surface), which also incorporates a LABYRINTH for sealing against positive and negative air pressure.

The THERMAL BARRIER further ensures energy saving by avoiding thermal energy escaping through the framework and as well as the undesirable formation of condensation on the frame.

The THERMAL BARRIER was developed by INTERKLIMA and is internationally patented (Ptn. No. 1003076/31.12.97).

The profiles are connected by means of special die-cast corner pieces to form the AHU sections. In this critical part of the joints, a special rubber piece is used to secure the continuation of the thermal barrier in the joints. This type of construction has the following features:

• excellent mechanical strength
• flexibility of construction
• perfect appearance and dimension precision
• quick and precise installation of interior components
• the possibility of completely dismantling the unit in case of difficult access and reassembling at minimum time and cost.

The panels are of the double-skin type, with the outer and inner skins fabricated of hot-dip galvanized steel and with the outer skin powder coated after manufacture and enamel baked RAL 9002. The panels can be supplied in either 40mm or 50mm thickness.

The panels can be insulated either with a rigid factory injected polyurethane insulation layer of at least 45kg/m3 density, which adds extra mechanical strength and rigidity to the panels, or with a factory applied mineral wool insulation layer of at least 60kg/m3 density. Both types of insulation have excellent heat insulation and noise reduction requirements.

The panels are supported on the frame through screws in pre-punched holes covered by specially made PVC cups for excellent appearance and protection against rusting of the screws. The service panels (Doors) are fixed on the frame by special chrome die-cast hinges developed by INTERKLIMA, permitting the doors to open either left or right or, the whole door to be removed in case inadequate space.