The concealed vent can be incorporated with Metal Technology's standard capped System 17, System 17 Latitude, and System 17 SP to provide a frameless opening vent.
Performance Overview
Weather Performance
Air Infiltration BS EN 1026 | Class 4 |
Watertightness BS EN 1027 | Class E900 |
Wind Resistance BS EN : 12211 | Class E2400 |
Size Limitation
Vent Width | Vent Height | Vent Weight | |
Top Hung Concealed Vent | 2500mm | 2500mm | 180Kg |
BREEAM Sustainability Rating
B Rating
Materials
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. Polyamide thermal breaks are produced from glass reinforced nylon sections designed to withstand temperatures in excess of 200°C, allowing the sections to be powder coated after thermally breaking.
Construction
Frame members are mitre cut at 45°, corners are reinforced with extruded aluminium crimping cleats and corner braces, and a secure joint is formed by pneumatically crimping into the extruded crimping cleat. Mullion and transom bars are square cut shaped and fixed securely to the frame by means of stainless steel screws and fixing cleats. All frame joints are sealed during construction against entry of water using Metal Technology’s two-part adhesive. Metal Technology recommend that only A2 or A4 Austenitic (300 series/class 70) stainless steel fixing screws are used in the assembly of their products.
Finishes
The range of sections can be provided in either of the following ranges of finishes:
- Anodised to BS 1615 or BS 3987 or BS EN 12373-1
- Powder organic coated to BS 6496 or BS EN 12206-1
This system can accommodate a different colour finish internally to that used externally. Metal Technology's powder coating is produced to Qualicoat standards.
Glazing
The system can accommodate a variety of different glazing thicknesses. Glass is structurally bonded to the vent profile by specialist silicone applicators.
Materials
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. Polyamide thermal breaks are produced from glass reinforced nylon sections designed to withstand temperatures in excess of 200°C, allowing the sections to be powder coated after thermally breaking.
Construction
Frame members are mitre cut at 45°, corners are reinforced with extruded aluminium crimping cleats and corner braces, and a secure joint is formed by pneumatically crimping into the extruded crimping cleat. Mullion and transom bars are square cut shaped and fixed securely to the frame by means of stainless steel screws and fixing cleats. All frame joints are sealed during construction against entry of water using Metal Technology’s two-part adhesive. Metal Technology recommend that only A2 or A4 Austenitic (300 series/class 70) stainless steel fixing screws are used in the assembly of their products.
Finishes
The range of sections can be provided in either of the following ranges of finishes:
- Anodised to BS 1615 or BS 3987 or BS EN 12373-1
- Powder organic coated to BS 6496 or BS EN 12206-1
This system can accommodate a different colour finish internally to that used externally. Metal Technology's powder coating is produced to Qualicoat standards.
Glazing
The system can accommodate a variety of different glazing thicknesses. Glass is structurally bonded to the vent profile by specialist silicone applicators.
Thermal Performance
Metal Technology’s Concealed Vent, in conjunction with the correct glass specification, is designed to aid compliance with the latest thermal requirements of the current building regulations.
System 17 Concealed Vent | U-Frame Values System 17 Concealed Vent (32mm) |
Outer frame and Vent | 2.33 w/m2k |
The following table, based on a standard commercial GGF window configuration and warm edge spacers, demonstrates how such improved U-frame values then contribute to improving the overall thermal performance of a complete window.
Achievable whole window U-value | Centre pane U-value | |
1.0 W/m2K | 0.6 W/m2K | |
Outer frame and Vent | 1.40 W/m2K | 1.10 W/m2K |
Metal Technology can provide tailored U-value calculations using their dedicated estimating software to calculate overall project average window U-values for their full range of systems.