These are muntins installed by the man­u­fac­turer of insu­lated glass inside the glass cham­ber. This is cur­rently the least often cho­sen form for divi­sion of glass panes. Inter-​pane muntins are man­u­fac­tured in thick­nesses of 8 mm, 18 mm, 26 mm and 45 mm. These muntins are avail­able in dif­fer­ent colours and in an imi­ta­tion wood variant.

Their main advan­tage is that they does not require main­te­nance and cause no prob­lems dur­ing clean­ing, as they are placed inside the win­dow. The down­side is that it is vis­i­ble that the muntins are made of a mate­r­ial other than wood. Fur­ther­more, they can­not be removed once win­dows are in use, as this would entail exchang­ing the whole glass pane set, which is costly.

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Fot. Szpros międzyszybowy