Weather King Windows feature "Weather Break"™ insulated glass manufactured in our own plants using the latest in warm edge glass technology. All "Weather Break"™ insulated glass incorporates the patented DuraSeal spacer from TruSeal Technologies that has been widely tested and proven to provide a long service life, reduced heat loss and less condensation on the glass.

  DuraSeal Warm Edge Spacer COMFORT E2 Low E Glass NFRC

* As an ENERGY STAR partner, Weather King has determined that all products bearing the ENERGY STAR logo meet or exceed the ENERGY STAR guidelines for energy efficiency.

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