A steel Out-swing 3+2 configuration with a fixed mullion separator. Notice the really high height and wide width of the panels.

An aluminum Out-swing 3-3 configuration.

Unclad all-wood Harmonica Bi-Fold door in an In-swing 2-1 configuration showing a partially open position.

GLAZING (if any):
Standard:  See each of the window models for details.

Optional:  See each of the window models for details.

Tempered or Laminated glazing is usually specified, as standard glass in inappropriate for large doors.

HARDWARE:
While most of the major European hardware makers have models for this, there are some others such as Brio from Australia that offer very robust hardware sets.
Security: Almost every configuration only has one locking mechanism at the point or points of closure.

     
HANDLES:
Handles are usually of the same make as the operating hardware and are available in the same colors as the window handles:  Roto, Winkhaus, Maco. and occasional substitute handles upon request and upcharge.

Configurations: Inside Handle Only and Handle-on-both-sides (the most common and recommended)

FRAME SEALS:
See each of the windows models for details.
Optional variations may be available upon request.
Acoustic Resistance:  See each of the window models for details.

COLORS:

See each of the window models for details.


AVAILABLE SHAPES and CONFIGURATIONS:
Shapes:  Rectangular Only

Configurations:  Two-panel fold-only, Two-panel with one independent sash, Three-panel fold-only, Three-panel with one independent sash attached to the three-panel bi-fold, Three-panel with one independent sash on the other side (of the two-panel bi-fold), Four-Panel in a 4-0, 3-1, or 2-2 configuration, Five-Panel in a 5-0, 4-1, and 3-2 configuration, Six-Panel in a 6-0, 5-1, 4-2, and 3-3 configuration, and so on up to an eight-panel unit with a maximum width of eight meters (about 25 feet).

The selection of Harmonica Bi-Fold doors is available in every profile system of our wood, aluminum, and steel offering, EXCEPT for the steel lnnovativ-ST 60. Even though they exist, we have decided not to offer any uPVC versions of these doors. These doors are designed for unblocked full-opening Patio, Terrace, and Deck access. While they have made a name for themselves in very exclusive high-end luxury applications, we believe that some of our offering is attainable for well-built middle-class homes. There are various configuration options where there can be single operable sashes that function as a single operable door. In addition, there are now fairly equal options for both inside or outside-stacking variants.

Harmonica Bi-Fold Doors 

HIGH PERFORMANCE WINDOWS + DOORS