Home > Companies > Selectaglaze Ltd > Series 55 Demountable Fixed Light

High security demountable fixed light (DFL) secondary glazing, providing intruder resistance, blast mitigation and protection against hand guns.

High security demountable fixed framing section. An aluminium subframe is permanently anchored to the reveal or wall face and a glazed frame attached with machine screws which are removable to allow the panel to be sleeved out for cleaning or maintenance. Offers high levels of security, suited to control rooms, secure laboratories and partitions.

Will reduce heat loss by up to 50% using standard glass and up to 65% with a thermally efficient glass (low emissivity). A high performance brush seal and perimeter mastic seals will almost eliminate drafts and ensure greater comfort near the window.


  • Acoustic: Tested in accordance with BS EN ISO 140-3: 1995 for acoustic performance: between 41 and 48 dB.
  • Thermal: U-values as low as 1.80 W/m²K (timber primary window and low-E glass in secondary glazing).


  • LPS 1175 SR1, SR2 and SR3.
  • ISO 16933 EXV 19 and 25.
  • EN 1522/ 1523 FB4.

Standard product features


- Material:

Extruded aluminium alloy 6063-T6.

- Style:




- Minimum (h x w):

400 x 400 mm.

- Maximum (h x w):

  • With blast resistance (ISO 16933 EXV 15/ 25): 3600 x 3600 mm.
  • With intruder resistance (LPS SR1/ 2/ 3): 3200 x 1800 mm.
  • With ballistic resistance (EN 1522/ 1523 FB4): 2500 x 1500 mm.
  • Curved head or jamb radius, minimum: 1500 mm.

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:
45-25-99/310 Aluminium window units

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 55 High Security demountable fixed light (DFL)


As primary window designs/ sightlines


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

Acoustic performance

[ ______ ]

Thermal performance

[ ______ ]

Blast performance

[Not required]
[ISO 16933 EXV 15]
[ISO 16933 EXV 25]

Physical performance

[Not required]
[LPS 1175 SR1]
[LPS 1175 SR2]
[LPS 1175 SR3]

Ballistic performance

[Not required]
[EN 1522/ 1523 FB4]


 - 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]
 - Thickness:
[9.5 mm]
[11.3 mm]
[11.5 mm]
[12 mm]
[12.04 mm]
[15.04 mm]
[22 mm]
 - Gasket:


 - Handles:
[ ______ ]
 - Locks:
[Not required]
[L29 Sprung restrictor stay]

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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