A little less frame.
A lot more home.

The OB36+ combines a 36 mm sash profile with an 84 mm glass-to-glass dimension at the hinged joint, giving it the lightest frame appearance of these three bifolds. Its deeper 82 mm frame accommodates double or triple glazing. OB36+ is the Soho bifold system, with integral glazing divides and a traditional lock-block detail. Choose open-glass Gallery styling, Soho divides or Georgian detailing, with Signature Knurled handles available in six finishes.

Styles

Gallery, Soho or Georgian

Sash profile

36 mm

At hinged joint

84 mm glass to glass

Frame depth

82 mm

Glazing

Double or triple

Best U-value

0.78 W/m²K with triple glazing

Best published whole-product U-value; lower means less heat loss. Your result depends on size, layout and glazing, and is confirmed in your quotation.

Specification advice Start here for slimmer closed-door views and a high-performance glass package. Plan the traffic-door position and folding stack together; everyday access depends on the panel arrangement.

The OB49 sits between the OB36+ and OB72 in frame width. Its 49 mm sash gives a 110 mm glass-to-glass dimension at the hinged joint. A 75 mm frame and choice of square or chamfered glazing beads—the trim around the glass—let you coordinate the finish with your home. Concealed running gear supports inward- or outward-folding layouts.

Styles

Gallery / applied Soho or Georgian

Sash profile

49 mm

At hinged joint

110 mm glass to glass

Frame depth

75 mm

Glazing units

28 or 32 mm

Best U-value

1.1 W/m²K with triple glazing

Best published whole-product U-value; lower means less heat loss. Your result depends on size, layout and glazing, and is confirmed in your quotation.

Specification advice A good starting point when you want a defined aluminium frame without the broader OB72 profile. Compare it with OB36+ for slimmer joints and thicker triple-glazing options.

The OB72 uses a 72 mm sash and a 154 mm glass-to-glass dimension at the hinged joint. Chamfered glazing beads give the frame a softer, more traditional edge. It shares the 75 mm frame depth of the OB49, with concealed running gear, multipoint locking and inward- or outward-opening configurations. Double and triple glazing can be specified within its 28 or 32 mm glazing options.

Styles

Gallery / applied Soho or Georgian

Sash profile

72 mm

At hinged joint

154 mm glass to glass

Frame depth

75 mm

Glazing units

28 or 32 mm

Best U-value

1.1 W/m²K with triple glazing

Best published whole-product U-value; lower means less heat loss. Your result depends on size, layout and glazing, and is confirmed in your quotation.

Specification advice Choose OB72 when a stronger frame suits the architecture. If the view through closed doors is your main priority, compare the narrower OB49 and OB36+ meeting profiles.

The OW70 combines a slim 65 mm frame-and-sash sightline with a flush exterior and square internal glazing beads. Its 70 mm frame accepts 28 mm double-glazed units. It is the Origin window range to choose for Soho, using true glazing divides; Gallery and Georgian looks are also available. Handle options include Signature Knurled, inline, offset, Monkey Tail and Pear Drop designs.

Opening frame + sash

65 mm

Frame depth

70 mm

Glazing

28 mm double glazing

Exterior finish

Flush casement

Best U-value

1.2 W/m²K

Best published whole-product U-value; lower means less heat loss. Your result depends on size, layout and glazing, and is confirmed in your quotation.

Specification advice Choose OW70 for slimmer opening frames or the Soho look. Compare OW80 if you want a flush finish inside as well as outside, triple glazing or an optional Aerogel insulation upgrade.

The OW80 has an 80 mm frame, a 91 mm opening frame-and-sash sightline and a flush finish both inside and outside. It accepts 28, 32 or 44 mm glazing, including triple-glazed specifications, with an optional Aerogel upgrade to the frame insulation. Yale Encloser locking and hinge guards support its security specification. Choose clear Gallery styling or applied bars for a Georgian appearance.

Opening frame + sash

91 mm

Frame depth

80 mm

Glazing units

28, 32 or 44 mm

Locking

Yale Encloser

Best U-value

0.8 W/m²K with Aerogel

The 0.8 W/m²K best published whole-window value requires Aerogel and a qualifying glazing specification. Size and layout affect the result; your quotation confirms the value.

Specification advice Start with OW80 when insulation and a flush interior are priorities. Its wider frame changes the glass area, so compare like-for-like elevations. For Soho windows, choose OW70.