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Another technical parameter, which must be specified for the window is its acoustic insulation-class acoustic. This parameter is characterized by the ability of windows for sound coming from the outside. Insulating window is determined by the weighted index Rw administered in decibels (dB), which takes into account the specificity of reception of sounds by the human ear. In practice, we can meet up with the rate of Rw25db Rw> 40dB. It is recommended that the following relationship between the level of noise insulation and windows: * Noise level of 60dB-25dB Rw * Noise level to 61-65 dBA-Rw30 dB * Noise level to 65-70 dBA-Rw35 dB * Noise level> 70 dBA-Rw40 dB At the sound insulation windows have the following factors: * Thickness and type of glazing * Width of the inter-chamber * Type of gas used to fill the chamber inter - * Cracks in the window used to obtain the correct air infiltration Another parameter, which should be specified for each window is the information that the window is made as tight.W where windows are as tight, must be accompanied by instructions trickle ventilation and the information that such windows can be applied only on the premises of the vent mechanical ventilation. The window can not absolutely tight, should provide a certain amount of air passing at a given time in order to ensure ventilation of living quarters. Coefficient of air infiltration, and "the premises of the gravitational ventilation should be 0.5 <a <1.0. In order to ensure proper ventilation and the flow of fresh air to the living quarters without any user intervention, it is recommended to mount the windows automatic ventilators. In practice, only one ventilator in the room-necessarily and bathroom. Building block for the window-outside-the primary material which simultaneously represents the largest share of the glass surface. Commonly used are the 1-chamber windows, consisting of two flat glass 4mm thick. frame combined with a width of 16mm. The space is closed inter-dried air or gas (argon, krypton, xenon) in order to increase thermal insulation and acoustic windows. The inner glass set is made of low carbon coating (metal oxides), which increases the absorption of heat from solar radiation and reduces heat loss from the living quarters. Weak point of this construction in terms of thermal glass is widely used in aluminum frame windows to connect to their circumference. Currently offered are no longer with the so-called glass. warm edge made of polymer composites or thin steel. Let us ask about ordering the windows version of the implementation of such a glazing. Window fittings used by the vast majority of producers are very good quality and our choice when ordering a window should be limited to providing basic functions such as: * Opens and repeal the wings, * quantity control, * Increased resistance to breaking (with special requirements) Window is a device construction and should be properly labeled and be accompanied by the information required by the Minister of Infrastructure Regulation of 11 August 2004 on ways to declare the conformity of construction products and how to identify them sign building (OJ No. 198/2004 item. 2041). The following sample is attached to the Charter of the device for marking window. Accordance with the above Regulation should be included in the mandatory information items 1-4 and sign construction. Other information is voluntary. In addition to the technical parameters characterizing the window manufacturer must attach the following documents: * Instructions built, * Instructions for maintenance and adjustment, * Instructions for safe use. Most manufacturers provide warranty on its products. The guarantee is the provision of voluntary, while accepting the proposed terms of the guarantee should become familiar with their specific terms. In practice, meets often formulated conditions guarantee that nothing is not responsible for the many responsibilities involved in maintaining the efficiency of the window shifted to the user. When buying a window, let us remember that we are guaranteed 24 months statutory responsibility