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For those wishing to limit air intrusion, Universal offers a single hung window option with our 800 Series, which utilizes a complete thermal break sash and master frame for optimal insulating value. The 800 Series features 7/8” clear insulating glass made with Super Spacer®, the world's only TrueWARM® edge technology and are top lite glazed to the master frame for reduced air infiltration. We install dual assembly screws at sash corners for added strength, and there is a bottom sash lock for easy access.

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