SL2 Window System – Manual

Suitable for narrow frame, non-screened applications. Residential, educational or commercial building designs.


SL2 is an aluminium framing system that is specifically designed for use with Altair Louvres. 

Features and benefits:

  • Maximum ventilation.
  • Extensive teting for proven performance and compliance.
  • Widest range of customising choices.
  • Pinned design that mechanically retains blades within the clips to prevent blade dislodgement under human impact (optional with the Stronghold System)

General information


Breezway offers an extensive range of colours and finishes, many with optional colour matched handles and clips.



Altair Louvre windows are available in three different surface finishes: 25 micron anodised, standard powder coating and high performance powder coating under warranty from Dulux and Akzo Nobel.

25 microns anodised

Standard powder coating

High performance powder coating


Aluminium, glass, polypropylene and acetal.


Various profiles available



While Altair Louvre Windows can be manufactured in any size specified, the wind and water rating for the building project will affect the maximum allowable window height and bay width. Altair Louvre Windows can have heights up to 3,020mm and blade lengths up to 1,127mm.



Subject to the Warranty Claim Procedure, Breezway warrants the goods supplied to be free of defects arising from faulty workmanship or materials for a period of up to ten (10) years on frames, seven (7) years on louvre moving parts, and three (3) years on electronic components from the date of purchase and guarantees that services will be rendered with due care and skill.

Uniclass 2015

Pr_30_59_98_34 Glass louvre window units

Specification data - Glass louvre window units Enhanced data


To AS 2047.

Dimensions and configurations

Can be custom manufactured to any size specified. Available in a variety of standard sizes.

Single Louvre Window Bay - A single louvre window bay contained within a single frame.

Multiple Louvre Window Bays - Multiple louvre window bays contained within a single frame, separated by mullions.

Horizontal fixed light combinations - Horizontal combination louvre fixed light windows are contained within a single frame with the louvres and the fixed lights separated with mullions.

Product performance


Ultimate limit state (ULS)

Up to 8,000 Pa.

Fire resistance level



Not rated

Bushfire attack resistance



To AS 3959.

Bushfire protection level

Up to BAL-19 using woven metal mesh screens, or up to BAL-FZ using bushfire shutters

Acoustic performance



To AS/NZS ISO 717.1.

Weighted sound reduction index (Rw)


Water penetration resistance



Up to 450 Pa


Patented living hinge and drainage channel designs for superior water performance. High Profile Sill to be used where >300Pa Water Penetration Resistance is required

Air infiltration


Low level

Patented 'Living Hinge' design that pulls the clips tightly against the channel when closed for superior water performance and air infiltration

High level

Patented 'Living Hinge' design that pulls the clips tightly against the channel when closed for superior water performance and air infiltration

Whole window U-value

U-value ranges from 4.1 W/m2.K to 6.0 W/m2.K based on the glass type.







Various profiles


Glazing or infill



To AS 1288

Glass louvre

Glass louvre blades

Fixed panel






Protection of openable windows

Opening restrictor.

Enhanced security

Internal security screens

Test results

Passed testing to 40,000 open/close cycles for long operational life.

Environmental information

Country of product manufacture