Series 663 is the impact and blast version of our 660 single hung window. This window product is approved for use in High Velocity Hurricane Zone (HVHZ) as large missile impact resistant. FPA # 9476.1 Single hung installation drawings - Single Hung Evaluation Report. Please contact EFCO's Product Technical Support Department for Blast / DoD applications.
- Thermal barrier in vent and frame
- Enhances energy saving potential
- Improves U-Value performance
- Weather-stripped sash and sill
- Provides superior air and water performance
- Continuous interlock meeting rails
- Improves air infiltration resistance
- Automatic sash locks available
- Increased convenience in operation
- Anodized and painted finishes available
- Unlimited options to answer economic and aesthetic concerns
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