Passive Ventilation


Bad interior office climates lead to yearly estimated costs of up to $75 Billion in the US.


Badly ventilated or polluted ventilation systems, pathogenic/allergenic organisms flourishing in the office interior climate due to high humidity and lack of ventilation, fungus growth due to the decay of building materials and risk to human health, thermal discomfort etc are common issues.

Studies have shown that sealed buildings with air-conditioning have a higher prevalence of work-related diseases (M. Mendell 1990,2004,2007). Considering that cities in New Zealand have excellent air quality (WHO studies 91 countries in 2003-2010), we need to look for solutions to use outdoor air in all seasons and limit unnecessary heat loss due to exaggerated ventilation rates.

The Ventalis self-regulating passive ventilation from Reynaers Aluminium is the first system in New Zealand that controls the air-flow from the outside to the inside, without using energy and with almost no maintenance.  A diaphragm closes off ventilation openings in the Ventalis box, as the pressure difference between in and out increases, resulting in an almost constant air-flow.  The system gets incorporated into the window joinery, and is ALWAYS operational unless closed off for specific reasons. 

Select Product Range to see an overview of the available products. 

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No more overcooling in winter times on windy days, always the exact amount of required fresh air.  Economic, smart and elegant.  A specially developed cap on the interior, drives the air flow towards the ceiling and making it imperceptible to the users inside.