Historic-type window EV47/IV78-3 has excellent thermal and sound insulation properties.

Extruded polystyrene foam has been integrated in the window frame to reduce the thermal conductivity and weight of the structure. Both the inner and the outer sash are opening inwards. The outer sash is 47mm thick with 4mm single glazing, the inner – 78mm thick with a two-chamber 40mm insulating glass unit and 2 sealing contours. For both sashes, we use modern Roto NT fittings, usually with T-shaped decorative handles. Concealed fittings may be selected for rectangular sashes.

Thermal conductivity coefficient of the window UW=0.8 W/m2K (calculated according to DIN EN ISO 10077-1), sound insulation around 40 dB.

For exploitation convenience, the handle of the outer sash is not positioned in the middle of the decorative bar, but constructively it can be placed on the closing bar.

Decorative cornices and capitals can be formed on the outside of the window.


Classical box-type window or lined window – is a historically tested wooden window structure with a frame embedded in the facade plane and having two sashes (inner and outer), both opening inwards. This type of window is, in fact, the only one suitable for buildings built from the XVIII century until 40th of the XX century. Its basic form and material have not changed over time, only the technical design has changed – nowadays, a heat-saving insulating glass unit and one or two rubber sealing contours are often embedded in the inner sash.

In historic buildings, when replacing the worn out box-type windows with 70, 80 and even 90mm thick modern windows, it often turns out that the new window is located in the freezing zone of the exterior wall and the window box gets wet and starts to mould because of the condensate. Due to the large construction depth (up to 200mm and even more) of the box-type window components, this zone is not located inside the room, but rather in the window structure between the sashes, therefore no moisture or mould appears in the window box. Box-type windows produced by FLORA Ltd meet the requirements for the restoration of cultural monuments. We also offer arched box-type windows.

Panes of a box-type window are usually divided using decorative glazing bars, the facade side features decorative cornices and capitals. The outer sash is glazed using silicone; however, decorative glass mouldings are also possible. We apply rubber sealing only to the inner sash to prevent condensation between the sashes and glass from sweating.

If you have to assess and compare the visual appeal of different types of windows, the box-type windows are definitely ranked at the top of the list – it is a magnificent, functional and decorative component, the pride of any facade.


The finish system of wooden windows produced by the Finnish company TEKNOS offers environmentally friendly water-based varnishes and paints. The standard offer includes 54 tones of varnish and covering paints according to RAL or NCS catalogues.