1.800.221.4169
Series 6551 is designed for educational, office, and healthcare facilities as well as multi-family residences and condominiums. It has undergone High Velocity Hurricane Zone (HVHZ) testing. (FPA #12908). Please contact EFCO's Product Technical Support Department for Blast / DoD applications.

E-Strut™ thermal isolator
Completely eliminates dry shrinkage
Improves thermal performance and enhances energy saving potential
Continuous interlock meeting rails
Improves air infiltration resistance
Accommodates glazing of 1/2", 1", and 1 3/16"
Allows use of common glass thicknesses
Sash glides on tandem steel ball bearing rollers over a raised sill track
The raised sill track minimizes the effect of dirt and debris build-up on the sill
Anodized and painted finishes available
Unlimited options to answer economic and aesthetic concerns
  • Series 6621 Fixed Impact Window

    Series 6621 Fixed Impact Window

    Details
    Elevations
  • Series 6551 Horizontal Sliding Impact Window

    Series 6551 Horizontal Sliding Impact Window

    Details
    Elevations
  • Series 6551 Horizontal Sliding Impact Window

    Series 6551 Horizontal Sliding Impact Window

    Details
    Elevations
  • Series 6551 Horizontal Sliding Impact Window

    Series 6551 Horizontal Sliding Impact Window

    Details
    Elevations
  • 1254

    1254

  • 1276

    1276

  • 1339

    1339

  • 1F66

    1F66

  • 1K48

    1K48

  • 1M13

    1M13

  • 1M14

    1M14

  • 2M16

    2M16

  • 2M28

    2M28

  • 2M33

    2M33

  • 3M04

    3M04

  • 3M09

    3M09

  • 3M14

    3M14

  • 3M19

    3M19

  • 3M24

    3M24

  • 4603

    4603

  • 4714

    4714

  • EH65

    EH65

  • EJ18

    EJ18

  • EK58

    EK58

  • 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

  • 3 7/8" Impact Subframe

    3 7/8" Impact Subframe

  • 1443

    1443

  • 1584

    1584

  • 2153

    2153

  • EX20

    EX20

  • EX28

    EX28

  • EX38

    EX38

  • EX52

    EX52

  • EX54

    EX54

  • EX56

    EX56

  • KC35SL

    KC35SL

  • 1S43

    1S43

  • 1S73

    1S73