Vent flap (E,T) The vent flap ensures permanent replacement of moist air inside the room by fresh air from the outside (20 m3 per hour) with the window closed. The built-in filter removes dust and other dirt from the air. The filter can be cleaned or replaced. This way of ventilation is convenient during the so-called transition period when the outer temperature does not drop below 0° C.
	Thermo strips (E,T) Original thermo strips create additional space for strengthening of heat insulation at spots where the lining is at an acute angle with the roof gradient. Bigger amount of heat insulation eliminates thermal bridges above and below the window.
	One-piece edging upper part The unique manufacturing technology at automatic forming centre enables production of the upper part of edging from one piece. This secures drain of rainwater from the entire roof surface above the window, as well as absolute sureness of watertightness, even in winter, when snow often remains above the window, and thaws and freezes again repeatedly.
	Wood with clear top glazing Wooden parts of the FENESTRA windows are made of first class pine. Basic preservation protects wood against blue-staining, moulds and dry-rot. Versatile top glazing develops final protection from water and UV radiation impact (basic preservation + 3 layers of glazing - 180 µ). It is not necessary to paint the windows after being assembled.

Sealing

No less important part of the energy-saving system is the two-stage combined sealing between the window frame and leaf preventing heat leakage out of the room reliably.

3rd stage sealing

The third stage of sealing is fitted in the outer flashing. It presents another barrier to prevent heat dissipation from the room, and at the same time, it does not allow water mist and moist air to penetrate under the window flashing. This way, perfect anti-leakage protection is ensured, even with very small gradients of the roof structure.

Al flashing

Flashing of FENESTRA roof windows is made of both-side painted aluminium sheet, which does not need any maintenance. The universal dun colour ensures aesthetic incorporation of windows into the roofing of all shades.

Embedding in the roofing plane

Harmonic embedding in the roofing plane has been achieved by means of lowering the upper level of the window by 35 mm. Embedding of the window in the roofing has also improved the thermal insulation parameters.

Cu flashing

We can manufacture copper-sheet flashing on request.

Press-up lock

The upper lock with a modern design and a press-up function ensures comfortable control, not risking unpleasant contact of finger joints with the upper part of the window frame. For windows placed in higher positions, we offer a number of control elements (lower lock, control stick, cord control, and electric remote control).

Central fitting

When you open the window leaf, ventilation is very intensive.You can easily control the amount of air flowing into the room using the locking positions of the central fitting. The central fitting is made of corrosion-proof steel, which ensures flawless function all over the window life cycle, and eliminates damage or material fatigue caused by motion of the most stressed window part.

Wood with white glazing

Windows of the WHITE finish with high resistant surface treatment are intended especially for rooms with high humidity (basic preservation + 7 layers of versatile white glazing - 300 µ).

Watertight and elegant

Encased sheet window sheathing, the window embedded in the roofing plane, and the curved upper part of edging give the FENESTRA roof windows very elegant and modern look. Guardings integrated in the lower part of the window make tight all spaces between the window leaf, frame and flashing, which protects the interior living space from blowing snow or water mist inside, even on the windward side, and when the roof gradient is small.

Insulation double glazing with "warm edge" The basic element is insulation double glazing (4-16-4 mm) with a soft coating layer, which ensures reflection of heat energy that is normally lost back into the room. The spacer bar between the panes, made of low conductive material, creates so-called warm edge. Besides the improved value of heat passage index (U_window = 1.1 W.m^-2.K^-1), it has major influence on reduced moisture condensate on the interior pane as well.

Warranty

We provide up to 15-year warranty for the FENESTRA windows.Windows are certified by an accredited testing laboratory with permanent supervision by an authorized person.

Price

Economic benefit is given by an excellent proportion of quality, utility properties, and the price, which will pleasantly surprise you not only at the moment of purchase, but for all the useful life, as prices of accessories and spare parts are lower by a class.