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).

General information


As drawing

As schedule

Uniclass 2015

Pr_30_59_98_02 Aluminium window unitsPrimary


null Secondary glazing system

L10/580 Secondary glazing system

Specification data - Aluminium window units

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.




Acoustic laminates

Available from 6.4 mm.

Clear float glass

Available from 4.0 mm.

Low E coated glass

Available from 4.0 mm.


Insert requirement.






Concealed stays

Multi point locking system

Sash opening restrictors

Standard butt hinges

Tilt and turn hinge and gearing







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

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.

Product Options

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.

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