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What is E-Vent™?

E-Vent™ is a new natural ventilation system with applications for both industrial and residential buildings with metal roofing. Seated alongside (and in place of) the ridge cap, E-Vent™ extracts hot air from the roof space with an innovative design that harnesses the combined natural forces of differential air pressure and convection. Designed by architect Ean McDonald to overcome the many problems with existing ventilation systems on the market, E-Vent™ has been found to be a highly effective, efficient and environmentally friendly venting solution (hence the ‘E’ in E-Vent™).  

How does E-Vent™ benefit you?

  • E-Vent™ reduces heat indoors
  • E-Vent™ is a part of the roofline and is barely noticeable
  • E-Vent™ provides protection from airborne embers
  • E-Vent™ effectively removes noxious gases, airborne bacteria and household odours
  • E-Vent™ reduces air conditioning costs
  • E-Vent™ is a low, one off cost
  • E-Vent™ requires absolutely no maintenance
  • E-Vent™ is a no cost, no fuss installation 

How does E-Vent™ work?

Using principles first expounded by Bernoulli and Venturi in the 18th century, Architect Ean McDonald created his E-Vent™ natural ventilating system, now available in various forms from Combined Metal Industries. Bernoulli propounded that the pressure of a moving body of air or water is least where the velocity of the mass is greatest. In simple terms, by accelerating an air flow across a given surface or opening, a pressure differential can be created to produce a natural force and that harnessed force can produce power. It is applied in aircraft flight and venturi systems generally. E-Vent™’s harness this natural power by creating low pressure areas on the upper and downwind sides of the vents creating a natural and effective exhausting air pump. That in turn means that air at normal pressure within a building will be literally sucked out by wind flow. And on the stillest of air days, E-Vents™ still work by reason of simple convection or ‘stack effect’.


Other applications

  • Ridge vent strips
  • Sloped roof skylights
  • Flat roof skylights
  • Vents for wet areas such as bathrooms, kitchens or toilets
  • Condensation prevention and extraction
  • Fire warning vents
  • High fume or dust extraction

Other benefits

  • Cost-free operation
  • Early smoke detection
  • Condensation management
  • Leaf and vermin proof
  • Rain draining
  • Satisfies all building laws
  • Tailor made to each installation
  • Non rusting materials
  • No moving parts = no maintenance

Ask your builder or architect …

… how little extra it will cost to add E-Vent™ to your metal roof home. Remember that without E-Vent™ , every year you will either suffer hotter temperatures or higher air conditioning costs.

Call Combined Metal Industries on 1800 651 303 for enquiries about E-Vent™. E-Vent™ is manufactured by Combined Metal Industries to ISO 9002 standards E-Vent™ Patent No. 673749

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