1.800.221.4169
Series 671 is the impact and blast version of our popular 670 double hung window. This window product is approved for use in High Velocity Hurricane Zone (HVHZ) as large missile impact resistant. FPA # 9475.1 Double hung installation drawings - Double 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
  • Double Hung

    Double Hung

    Details
    Elevations
  • 2129

    2129

  • 2349

    2349

  • 2382

    2382

  • 2804

    2804

  • 2841

    2841

  • 2903

    2903

  • 2904

    2904

  • 2908

    2908

  • 2909

    2909

  • 2910

    2910

  • 2912

    2912

  • 2913

    2913

  • 2922

    2922

  • 2937

    2937

  • 2987

    2987

  • 2997

    2997

  • 3638

    3638

  • 4189

    4189

  • 1443

    1443

  • 1584

    1584

  • 2153

    2153

  • EX20

    EX20

  • EX28

    EX28

  • EX38

    EX38

  • EX52

    EX52

  • EX54

    EX54

  • EX56

    EX56

  • KC35SL

    KC35SL

  • 1S43

    1S43

  • 1S73

    1S73