Opening

No opening

The light bands without opening provide lighting of rooms, but do not enable air ventilation.

With opening

Regarding the purpose of opening we distinguish two kinds of opening systems:

• air-ventilating systems (manual, electrical, or pneumatic opening)
• heat and smoke exhausting systems for the case of fire

The simultaneous application of both systems is also possible. Only the opening of the middle elements is possible at the acrylic light bands, while the end adjusting elements are always fixed. All the middle segments of the light bands, meant for opening, are equipped with the additional built-in opening frames and hinges, enabling the opening and closing of the middle segments of light bands.

Manual opening
This is the most simple and least costly opening system. It is used in places, where the height from floor to the skylight does not exceed 5 m (sanitary fittings, kitchens, schoolrooms, offices, corridors).

The system is composed of the telescopic spindle and a handle (2-4 m). The fixed part of the telescopic spindle is attached to the crown of light band by means of the forks, while the moving part is attached to the light band segment’s aluminium frame (the sealing, built-in into the frame), attached to the crown by hinges.

Depending on the size of the middle acrylic element of the light band, the mechanism with one or two spindles is used (tandem). The tandem is used at larger acrylic light bands. At the tandem opening the two spindles are mutually connected with the couplant axis.

It is possible to combine the manual mechanism with the smoke and heat exhausting mechanism. The independent use is appropriate exclusively for the air ventilation requirements.

Electrical opening
The opening with the electromotive actuators is carried out by means of the electric engines of various designs. The electric engines, operating on the voltage of 230 V and 24 V, used for this purpose, in the standard design enabling lateral lifting of the sky dome till the height of 300 mm, are intended exclusively for the air ventilation. The electric engines with the toothed slats of the lengths of 350, 550, 750, or 1000 mm, are used for larger opening angles.

The engine, and consequently the opening of the skylight, is controlled with the switch, by means of which the skylight can be opened, closed, or stopped in the wanted position. The final closing and stopping is automated. The opening by means of the electro-motive actuators is available in various designs. The available options are the single or the tandem design.

The choice of the electric engine type depends on:

• purpose of skylights (air ventilation, natural smoke and heat exhausting),
• size of skylights - considering the proper weight of skylights, as well as the load, additionally carried by such a skylight (snow - weather conditions allowance).

Pneumatic opening
It is used especially in the premises where the compressed air is available, since the pneumatic opening requires the supply of the compressed air of 4-8 bar (primary installation). The primary installation shall contain the adequate connections for the air inlet to the skylight.

The standard pneumatic cylinders of the type 32/320 or 50/320 are used for the pneumatic opening; however, the incorporation of the non-standard cylinders is also possible on special agreement. The markings 32 or 50 designate the diameter of the cylinder, and the marking 320 designates its length. The use of varied diameter depends on the weight and the size of the sky dome to be opened. In the case of several air ventilation skylights built-in at the same building, it is possible to perform the opening of each individual skylight separately; nevertheless, the simultaneous opening of several skylights is feasible, too. The stroke of the cylinder assures the maximum lateral lift of the skylight up to 300 mm, and it is suitable only for air ventilation; however, in the case of fire, it can be combined with the smoke and heat exhausting mechanism.

The opening is regulated with a switch with only two operation positions: open and closed.

The pneumatic opening is especially suitable for the premises with a high specific humidity and dirt, since in such conditions the electric opening is rather difficult to be carried out.