Vertical Sliding
Aluminium Secondary Glazing

Vertical Sliding Secondary Glazing

Our Vertical Sliding Secondary Glazing is ideal for heat and sound proofing for traditional wooden box sash windows, or any other windows that have horizontal bars. Panels slide open in the same way as vertical sliding sash windows and provide easy access to the existing window. When open they provide ventilation without interfering with curtains or blinds.

Our Vertical Sliding Secondary Glazing is extremely versatile, slides smoothly and is available with spring balances or spring catches to hold sliding sashes in an open position. We can also offer our unique tilt back easy clean vertical sliders.

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Technical Specifications

The sizes detailed below are for guidance only, if the sizes you require are less than the minimum or exceed our maximum recommended sizes - please ask our technical department for advice.

Economy Odd Leg System

Luxury Subframe System

Key Dimensions And Sight-lines
Outerframe Depth (mm) 39
Sash Depth (mm) 13
Glass (mm) 4 - 6.8
Max. Distance To Visible Glass (mm) 82
Size of Vertical Interlock (mm)² 20
Key Dimensions And Sight-lines
Outerframe Depth (mm)¹ 39
Sash Depth (mm) 13
Glass (mm) 4 - 6.8
Max. Distance To Visible Glass (mm) 57
Size of Vertical Interlock (mm)² 20

² The visible interlock is 33mm for our unbalanced vertical slider when you account for the spring catch adaptor.

Unbalanced Vertical Slider

Balanced Vertical Slider

Recommended Sizes
Min. Width (mm) 400
Max. Width (mm) 1250
Min. Height (mm) 600
Max. Height (mm) 1850
Max. Panel Weight (kg) 18
Recommended Sizes
Min. Width (mm) 400
Max. Width (mm) 1250
Min. Height (mm) 800
Max. Height (mm) 2450
Max. Panel Weight (kg) 18

¹ We offer three different subframes for our Luxury system; giving a depth of SF1: 39mm, SF3: 55mm, SF4: 69mm.
² The visible interlock is in fact 33mm for our unbalanced vertical slider when including the spring catch adaptor.

Balanced Vertical Slider - Heavy Duty System

Recommended Sizes
Min. Width (mm) 400
Max. Width (mm) 1500
Min. Height (mm) 900
Max. Height (mm) 2800
Max. Panel Weight (kg) 50
Key Dimensions And Sight-lines
Outerframe Depth (mm) 56
Sash Depth (mm) 29
Glass (mm) 4 - 20
Largest distance to visible glass (mm) 80
Size of Vertical Interlock (mm) 35

Tilt Back Vertical Slider - Luxury Subframe System

Recommended Sizes
Min. Width (mm) 400
Max. Width (mm) 1250
Min. Height (mm) 800
Max. Height (mm) 2450
Max. Panel Weight (kg) 18
Key Dimensions And Sight-lines
Outerframe Depth (mm)1 44
Sash Depth (mm) 19.4
Glass (mm) 4 - 6.8
Largest distance to visible glass (mm) 81.5
Size of Vertical Interlock (mm) 27

¹ We offer three different subframes for our Luxury system; giving a depth of SF1: 39mm, SF3: 55mm, SF4: 69mm.

Specifying - Suitable Applications
  • Vertical Sliding Secondary Glazing is most suited for treating sash windows or windows with horizontal bars.
  • Can be specified for commercial or domestic applications. (Luxury Subframe being most suited to residential applications due to its aesthetic appeal.)
  • Busy areas where traffic noise is a nuisance - even where double glazing is already fitted.
  • Ideal for use in Listed Buildings, Heritage / Conservation areas and period properties.
  • As a cost effective alternative to replacing your existing single glazed windows.
  • Leasehold properties, where changing the existing windows may be uneconomical.
  • Any property where you are unable to modify the existing external windows.
  • Any window that needs noise reduction and / or draught reduction.

Please note: Glass specified must comply to the glass safety BS 6262: Part 4, 1994 regulations. (see document downloads)

Document Downloads
Secondary Specifications
(20 page specification guide, detailing all available secondary glazing.)

(2.1 Mb)
Fitting & Measuring Guide
(8 page installation and measuring guide for our secondary glazing.)

(0.4 Mb)
Glass Safety Guidelines
(Guide to where you must comply with glass safety regulations.)

(0.1 Mb)
Technical Manuals Downloads
Economy Odd Leg System
(Section Identification, Profiles, Combinations and Sight lines.)
pdf order checklist
(0.4 Mb)
Luxury Subframe System
(Section Identification, Profiles, Combinations and Sight lines.)
pdf order checklist
(1.0 Mb)
Heavy Duty System
(Section Identification, Profiles, Combinations and Sight lines.)
pdf order checklist
(0.4 Mb)
Technical Drawings - Downloads

Technical drawings can be provided in DWG or DXF format, please contact us.

Please remember all sizes are for guidance only and are subject to location of the fitted product. Please contact us for more information.

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Contact Information

  • T: 01268 681612 (Office)
  • T: 01268 695100 (Showrooms)

  • F: 01268 510058 (office)
  • E: sales@duration.co.uk
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