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This is because of the problem of excess stress caused by positive or negative pressure that would occur within the units due to changes in temperature and atmospheric pressure.Conventional IGUs reflect distorted images.The distortions are due to pressure variations in the IGUs.

If a conventional multi-layered sealed insulating glass unit is made thicker than about 2.25", and is not pressure equalized, it will likely have excessive stress on the interior and exterior glass lites causing the edge seals to fail prematurely or even causing the glass to break.





The distortions show the IGUs' edge seals are stressed.







Stressed IGUs have shorter lives.



The LiteZoneâ„¢ IGU design solves this problem with technology that allows the air pressure to equalize between the inside and outside of the glass unit without water vapour entering the unit. This greatly reduces the stress on the edge seals, allowing LiteZoneâ„¢ IGUs to be .







LiteZone is pressure equalized so its glass is unstressed and flat.







LiteZone glass reflects undistorted pleasing images.





The desiccant removes and modulates the water vapour in the air moving through the conduit in and out of the glass unit. The moisture adsorption rates for the volume of desiccant within the conduit ensures that the air within the glass unit will be kept dry and the unit will be free of any risk of condensation for more than 60 years.



The system requires no special servicing procedures during the life of the glass unit and LiteZoneâ„¢ IGUs can be installed into frames in the same way as any conventional glass unit.