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Wonder Premium

 Premium = Warm Edge Triple Heat Shield Argon Technology with foam filled frame.

  • Exceptionally Low Air Infilitration Rating
  • Triple Pane - Double Strength - Heat Shield Glass
  • Heatseal® Spacer with Argon Fill
  • Beautfil Beveled Foam Insulated Frame and Sash
  • Full Interlock with Triple Weather-Stripping
  • NFRC U-Factor: 0.20   Air Infiltration: <0.01 Solar Heat Gain: 0.27