The unit is composed of 2 x 4mm glass panes, but is also available in 6mm panes. The glass panes are bonded using butyl and are separated by a 22mm aluminium space bar.
The hermetic glass contains an aluminium blind structure built-in between the 2 panes. The blades of the blind can be opened and closed using an external operating device. The device can be one of three options: A magnetic attachment, a push / pull stick attached to a chord inside the unit, or, a small-beaded chain.
A major advantage of using this type of unit is that the blind is protected against dust and dirt because the glass will remain sealed for at least 30 years.