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ConceptSystem 77 Hidden Vent

Technical information



Thermal insulation - Uf
1.8 W/m²K
Thermal insulation - Uw
1.5 W/m²K


Air tightness
Class 4 (600Pa)
Water tightness
Class E750 (750Pa)
Wind load resistance
Class C4 (1600Pa)
Acoustics - Rw(C;Ctr)
46(-1;-4) dB


Opening & closing resistance
Class 3
* Note: Performances and properties may be different depending on the profile combinations


Max. dimensions & weight

Min. height of element
668 mm
Min. width of element
518 mm
Min. height of vent
600 mm
Max. height of vent
2400 mm
Min. width of vent
450 mm
Max. width of vent
800 mm
Max. weight of vent
120 kg


Min. frame width (inward opening)
76 mm
Min. frame-vent width (inward opening)
76 mm
Min. vent-vent width (inward opening)
118 mm
Min. width T-profile
101 mm
Depth frame
68 mm
Depth Vent
72.5 mm
Depth frame-vent
77 mm


Rebate height
18.5 mm
Glazing method
Dry glazing Siliconized glazing Internal glazing External glazing Glazing bead
Min. glass thickness - frame/element
4 mm
Max. glass thickness - frame/element
48 mm
Min. glass thickness - vent
21 mm
Max. glass thickness - vent
48 mm