Home > Companies > Selectaglaze Ltd > Series 25 Vertical Sliding

Mid-range, vertical sliding (VS) secondary glazing unit in two or three-pane sliding sash options. It has higher capacity balances to allow treatment of larger windows, and supports thicker glass for higher noise insulation.

Comprises of a mid-range versatile vertical sliding framing section, with contra-sliding sashes, providing access to the primary windows for cleaning. The sashes are removable. A minimum frame gap of 75 mm is recommended. Sashes slide within the frame so do not interfere with blinds or curtains. Twin brush seals ensure high sealing efficiency.

Suitable for listed buildings where the primary glazing cannot be changed. It is a reversible adaptation, so generally accepted by heritage agencies.


  • Blast tested to ISO 16933 Classification code EXV 33.
  • Secured by Design accredited.

Standard product features


- Material:

Extruded aluminium alloy 6063-T6.

- Style:




Single sash maximum width: 1600 mm. Sash height to width ratio should not normally exceed 1:3.

  • Frame, minimum (h x w): 300 x 350 mm.
  • Frame, maximum (h x w): 3000 x 1600 mm.

Maximum sash area is subject to 31 kg.

Thermal performance:

Values of <2.9 W/m²K available; consult manufacturer for details.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
25-90-35/150 Putty-fronted single glazing system

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Selectaglaze Ltd


+44 (0)1727 837271

Product reference

Series 25 Vertical Sliding (VS)


[As primary window designs/ sightlines]
[Two pane, vertical sliding]


[As drawing]
Insert details.
[As schedule]
Insert details.

Acoustic performance

[ ______ ]

Thermal performance

[ ______ ]


 - Finish:
[Anodizing, Analok bronze AA25]
[Anodizing, Analok silver AA10]
[Polyester powder-coating, HIPCA 9910 semi-gloss white]
[Polyester powder-coating, RAL]
Insert RAL colour.
[Wood grain effect]
 - Gloss level:
[Not required]
[High gloss]


 - Type:
[Laminated, low -E]
[Toughened, low-E]
 - Thickness:
[4 mm]
[6 mm]
[6.4 mm]
[6.8 mm]
[7.5 mm]
[8 mm]
[8.8 mm]
 - Gasket:


 - Handles:
[H3 recessed finger pull, colour matched to frame]
[H17 cranked D handle, colour matched to frame]
 - Locks:
[Not required]
[L2 fitch catch (lockable), black]
[L2 fitch catch (lockable), brushed steel]
[L2 fitch catch (lockable), gold]
[L2 fitch catch (lockable), polished chrome]
[L2 fitch catch (lockable), white]
[L24 S15/25 sliding latch, colour matched to frame]

Trickle ventilators

[Not required]
[Over the frame acoustic ventilator]
[Over the frame standard ventilator]

Acoustic reveal linings

[Not required]
[Vinyl faced acoustic foam]

Manufacturer details

Alban Park,
Hatfield Road,
St Albans,
Hertfordshire, AL4 0JJ
Tel +44 (0)1727 837271
Fax +44 (0)1727 844053
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