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WCO natural louvred ventilator

WCO can provide extract ventilation as well as allow the entry of natural daylight for most kinds of industrial and commercial buildings. WCO is predominantly a Climate Control product, as it’s top section provides maximum ventilation. WCO can also be used for emergency smoke extract ventilation, although it is not certified as a smoke ventilator. Two controllable side dampers provide day-to-day ventilation when it is raining.


All principal components manufactured from corrosion resistant aluminium alloy grade 3005 in accordance with EN573-3, with stainless steel fixings.

Dimensions/ size range

  • Nine width options from 550mm throat width to 1900mm throat width
  • 21 length options available from 638mm to 3298mm throat length

Louvre options

Depending on the application, the louvres on the top of the ventilator are made from:

  • Single skin aluminium
  • Double skin aluminium
  • Twin wall clear or opaque polycarbonate

These louvres incorporate either low-loss brush seals (for aluminium louvres) or rubber seals (for polycarbonate louvres) to reduce air leakage when the ventilator is closed. The side louvres have the option for low-loss brush seals.

Base Fixing Type

Aluminium base profile to suit:

  • sheeting
  • curb
  • glazing curtain walling systems


  • Pneumatic
  • 24V DC electric
  • 230V AC electric
  • Manual

For both electric and pneumatic versions, activation is either by double action locking mechanisms, or failsafe open / failsafe closed options.

If used as a smoke ventilator, activation is either by local thermal fuse which opens the unit at a pre-selected temperature, or by responding to an external release signal. (Please note that it is not certified as a smoke ventilator).

Decorative Finish

  • Mill finish
  • Polyester powder paint to a RAL colour, standard 75 mu


Factory fitted guards to the inside the throat of the ventilator avilable:

  • bird
  • insect
  • security

Please contact us for more information relating to the application, specification, installation and servicing of this product.

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