AT 740 SI (Hidden Vent Window)

Product Group
Windows, Hidden Vent Windows
AT 740 SI (Hidden Vent Window)

System Description

With the AKOTHERM hidden vent window system, viewed from the outside the sash is completely hidden by the frame. This ensures an absolutely homogeneous look and gives you creative leeway, particularly when installed in the AKOTHERM facade constructions.

The corner connectors can be pressed/pinned together using corner brackets. All standard hardware such as turn, turn/tilt and tilt can be incorporated in the AT 740 SI system.


2D cross section

Product Specifications

Installation Depths

Installation depths frame 75 mm, sash 79.5 mm


20 to 62 mm

Air permeability

EN 12207: Class 4

Thermal transmittance

as per EN 10077-2: Uf = up to 1.8 W / (m² K)

Burglar Resistance

up to RC3

Driving rain resistance

EN 12208: Class E 900


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AT 740 SI (Hidden Vent Window)

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