to be ten millimeters wide and more. The size of an air chamber depends on width of hollow rectangular section of the profile in a different way called by "a remote frame". This frame is filled with the substance (a molecular sieve, silica gel) absorbing moisture which does not allow glasses to mist over from within, extending parts of moisture from space between them. Double-glazed windows with two glasses are called single-chamber, and with three — two-chamber though it is often possible to hear not absolutely correct phrase "two-chamber" or "three-chambered double-glazed window".
Due to tightness of a double-glazed window which is reached by use of special pitches need to wipe internal surfaces of glasses disappears.