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Two chamber glass packets

Double chamber insulated glass units - insulated glass units that consist of three panes connected with aluminum or plastic spacers and two isolated chambers, which can be filled with air or other inert gas (usually argon). A light transmittance coefficient LT of such insulted glass unit is worse than the single-chamber glass-unit.

The heat transfer coefficient U can be both better and worse comparing with a single-chamber insulted glass unit. It depends on what kind of panes will be used and what will be the air gaps in between it. while using two selective panes with the air gaps in between at least of 12 mm and filled with argon gas the heat transfer coefficient (U) can be reduced to ≤ 0.4 W / m² K.

Advantages and disadvantages:
- In double chamber insulted glass units the possibility of condensation at glass unit edges is reduced even using conventional aluminium spacers.
- The use of certain panes and the air gaps in between them (as well as special gas filling) can significantly improve thermal insulation (≤ 0.4 W / m K).
- Such glass units are not clearly better in point of sound insulation. Such units can increase the resonance, resulting from low-frequency sounds, which are caused by air in closed chamber (air operates as a spring); the mentioned glass unit is double chambered. In order to in insulate from sound these insulted glass units must be manufactured with a gaps in between the panes of no less than 10mm.
- The only disadvantage of this glass package is that it is heavier than single-chamber glass packet.