Also known as internal spacer bar, muntin bars, inter bar or duplex system, these products are designed to give the appearance of multiple units within a single sealed unit.
Externally mounted stick-on profiles are used to cover over the bars and create that authentic look.
Glasscraft offers a range of solutions to match perimeter spacer bar colours.
The internal bars are always narrower than the perimeter spacer bar, e.g. 20mm perimeter would use 16mm internal, 16mm perimeter would use 12mm internal. This is to allow the glass to flex normally. Having the internal bars the same as the perimeter would stop the glass moving inwards and may cause breakages.