A wall length bi-fold door opens to connect the kitchen to the patio seating area.
A partially open, bi-fold door expands this great room to the balcony seating area.
The wall length bi-fold door with divided lights frames backyard views in this living room.
An employee measuring hardware.
When fully open, this bi-fold door connects the patio with the pool house’s interior.

Series 9550 Bi-Fold Door

Powerful. Easy to operate. Versatile. The Series 9550 Bi-Fold door from Western Window Systems is designed to smoothly stack and fold against side walls, creating a huge opening from corner to corner, connecting the inside with the outside. And with multiple sill options, both inswing and outswing capabilities, and countless sizes, configurations, and finishes, you can unlock several creative possibilities.

  • Large panel sizes
  • Single track operation
  • Multiple sill height options
  • Panels up to 42″ wide or 144″ tall
  • Premium hardware and roller options
  • Low-E glass, dual-paned
  • Thermally broken aluminum
  • Single or double swing door options



The incredible design of the Series 9550 Bi-Fold Door makes any project stunning. A 2.25″ x 3.5″ stile provides more glass and natural light. A concealed stainless-steel, multi-point lock secures panels while staying out of sight. And a frame and sill depth of 4.50″ allows for a clean integration into nearly any wall condition.
The partially open bi-fold doors eliminate the barrier between the outside entertaining space and the living room.


Sealed, stainless-steel ball bearing rollers make the Series 9550 Bi-Fold Door easy to operate. Stainless-steel, head-load carriers and hinges are capable of handling panels weighing up to 264 pounds. Bottom-load carriers and hinges can accommodate door panels weighing up to 176 pounds.

Configurations and Sizes

Western Window Systems’ Series 9550 Bi-Fold Door is available in a multitude of configurations with panels up to 42′ wide and 12′ tall (not to exceed 264 pounds per panel). It has a sixteen-panel maximum, eight in each direction, and can be specified to swing inward or outward.
An open bi-fold door connects the dining area to an outdoor seating area right by mountainous terrain.
This 3-panel bi-fold door frames a green backyard.
Series 9550 Bi-Fold Window

Turn a Bi-Fold Door into a Bi-Fold Window

Perfect for entertaining spaces like patios and decks, opening up a kitchen to the outdoors, or creating a relaxing window seat open to a spectacular view, the Series 9550 Bi-Fold Door is an equally amazing window too.

Carrier Hinges

An image of a bottom load carrier hinge.

Carrier Hinge

Bottom load bi-fold
Heavy Duty Carrier Hinge

Heavy Duty Carrier Hinge

Head load bi-fold
An image of a head load carrier hinge.

Carrier Hinge

Head load bi-fold

Bottom-Load Sill Tracks

Floor Load water Barrier Sill

Water Barrier Sill

Safeguards against water intrusion while providing a tight seal. Interior leg is 2.51″. Thresholds are finished to match the frame color.
Floor Load Flush Sill crop

Flush Sill

When ease of entry is more important than climate performance, the flush sill lines up with most interior flooring for a smooth transition to the outdoors. Interior threshold height is 1.76″. Thresholds are finished to match the color of the frame.

Top-Hung Sill Tracks

Flush Sill

Lines up with nearly any interior flooring for a smooth transition to the outdoors. Interior threshold height of 1.07″. Thresholds are finished to match the color of the frame.

Water Barrier Sill

A tight seal helps to safeguard against water intrusion. Interior leg is 1.82″. Thresholds are finished to match the frame color.
Top Hung U Channel crop


The U-track allows for a flush transition from room to room and is offered in a dark bronze finish. Not rated for water and air infiltration.

Handles and Locking

Designed for durability and comfort, the Series 9550 Bi-Fold Door features three high-quality, contemporary-style handles.

Dallas Handle

Located on all active panels, includes a keyed lock. In brushed nickel or black and only available on doors.

D-Shaped Pull Handle

D-Shaped Pull Handle

Further aids in opening and closing the door. Available in stainless-steel or black.
Inactive Lock Handle

Inactive Lock Handle

Secures the door panels with steel pins at the head and sill. Available in brushed nickel or black.


Samples shown are representative only. For exact paint swatch samples, find a dealer near you.

2023 Finishes

In-Stock Finishes

Bronze Anodized and Satin Anodized aluminum feature a Class 1 coating thickness for increased smoothness and durability.

Designer Finishes

Include a high-quality paint finish that conforms to a minimum rating of AAMA-2605, currently the highest rating for organic finishes.

Custom Finishes

Provide a sample of your desired color, and we’ll match it.



How They’re Made

Built and tested to last.

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Western Window System

What Makes Them Great

Designed for indoor-outdoor living.

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A two-story house built into a mountain side displays a number of floor-to-ceiling window walls and multi-slides looking out onto a pool.

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