Natural Air Ventilator


Natural Air Ventilator

Key Features


  • Standard drainable or storm louvre
  • Insulated or acoustic damper blades 
  • Single blade aluminium, insulated, acoustic or plastic blade damper options
  • Controlled ventilation
  • Fresh air intake or extract 
  • Passive night cooling 
  • Link to BMS 
  • Fit to structure or window systems


While openable windows offer primary ventilation, it is often difficult to use them due to draughts, rain, cold and noise issues. Roof mounted air systems often rely on wind and wind direction, therefore while they offer some opportunity for air intake and extraction at high level, many leading designers are introducing low level natural air ventilators (NAVs) at or below window level, the purpose of which is to control ventilation (to ensure an adequate supply) and so prevent build up of carbon dioxide during the day. These natural air ventilators normally comprise of an external louvre for weather protection and an internal electrically controlled damper, linked to the BMS. Another benefit of NAVs is their use in nighttime cooling systems as they do provide security against building entry.
Slimtype, 50, 75, 100 or SLH-S series louvre with integral aluminium blade damper incorporating blade and side seals


Louvre and damper frame extruded aluminium grade ENAW 6063T6 to BSEN 755.

Frame construction
Screw joints as standard.

Extruded aluminium (mill finish).
Polyester powder coated to BS 6496.
Anodised to BS3987.

Bird wire guard if speciified, 18g expanded aluminium.

Insect screen
If specified, 23g expanded aluminium.



Drawing files

Download files (PDF)

Product Documents

Title Type Added
Natural air ventilators catalogue Brochures about 4 years ago

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