Home > Companies > Ventrolla Sash Window Restoration > Secondary Glazing Hinged Units

Hinged casement secondary glazing available in single and double leaf configurations. An extremely versatile system suited to larger glazed areas, it affords a high level of security whilst retaining easy access to the primary glazing for cleaning and general maintenance. Can be supplied with arched or gothic head profiles plus the ability to stack on and couple to other units.


Tested and approved to the following British Standards:

  • BS 1474 (Aluminium Alloy).
  • BS 7386 (Polypropylene draught strip).
  • BS 6375-1 (Performance - Water tightness - Test pressure class 300 Pa).
  • BS 5368-1 (Performance - Air permeability - Test pressure class 600 Pa).
  • BS 5821-3 (Acoustic performance - Weighted sound reduction index, minimum Rw 50 dB).
  • BS 6206 (Glazing).
  • BS 2782 (Gaskets).

Standard product features


Aluminium 6063 T6 Alloy to BS 1474.

Weather pile:

Polypropylene draught strip to BS 7386.


  • Water tightness (to BS 6375-1): Test pressure class 300 Pa.
  • Air permeability (to BS 5368-1): Test pressure class 600 Pa.
  • Acoustic performance (to BS 5821-3): Weighted sound reduction index, minimum Rw 50 dB.
  • Thermal insulation: When glazed with a hard coat Low E glass, a U-value of 1.868 W/m²K can be achieved.


Size (w x h, maximum):

  • Single leaf: 950 x 2100 mm.
  • Double leaf: 3000 x 3000 mm.

Frame finish:

Anodized to AA5 - BS 3987 as standard. RAL colours and non-standard specifics available on request.


Glazing to BS 6206 available in specialist acoustic laminates, toughened and laminated Low E, class A security laminates and double glazed sealed units to 24 mm.


Extruded to BS 2782. Standard colour black, white gaskets available on request.


Comprehensive range of hinge arrangements, handle types and locking mechanisms available, consult with Ventrolla Ltd for exact details.


Hardwood or PVC-U trims colour coded in a range of sizes.

Grounds/ Sub-frames:

Standard hardwood grounds/ sub frames to suit differing fixing methods.


Consult Ventrolla for recommendations and 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

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Ventrolla Sash Window Restoration


+44 (0)1423 859323

Product reference

Secondary Glazing Hinged Units


[Single leaf, bottom hung]
[Single leaf, side hung]
[Single leaf, tilt and turn]
[Single leaf, top hung]
[Double leaf, side hung]


[As drawing]
[As schedule]

Special features

[Not required]
[Arched head]
[Gothic head]

Frame finish

[Anodized, natural]
[Polyester powder coating, white]
[Polyester powder coating, van dyke brown]
[Polyester powder coating, RAL]
Special order, insert colour requirement.


 - Type:
[Acoustic laminates]
Available from 6.4 mm.
[Clear float glass]
Available from 4.0 mm.
[Low E coated glass]
Available from 4.0 mm.
 - Thickness:
[ ______ ]




[Concealed stays]
[Multi point locking system]
[Sash opening restrictors]
[Standard butt hinges]
[Tilt and turn hinge and gearing]


 - Material:
 - Size:
[6 x 15 mm D.B.N]
[6 x 33 mm D.B.N]
[6 x 43 mm D.B.N]
[6 x 21 mm S.B.N]
[6 x 27 mm S.B.N]
[6 x 37 mm S.B.N]
[6 x 44 mm S.B.N]
[6 x 55 mm S.B.N]
[6 x 75 mm S.B.N]

Grounds/ Sub-frame

[21 x 45 mm hardwood sub-frame, standard fix]
[21 x 62 mm hardwood sub-frame, reveal fix]
[30 x 30 mm hardwood sub-frame, bay adaptor]


[Face fix]
[Reveal fix]

Manufacturer details

Ventrolla House,
Crimple Court,
Hornbeam Business Park,
North Yorkshire, HG2 8PB
Tel +44 (0)1423 859323
Fax +44 (0)1423 859321
NBS Plus