RIBAJ Submission: the Impact COVID19 will have on your ventilation strategy

03 Jun 2021

Research suggests that we spend around 90% of our time indoors. Critically, and often quite undetected, these are poorly ventilated spaces that are having an adverse effect on our health and our daily lives. No doubt air-quality and the effect of these microscopic particles on our bodies is being put under the spotlight in the wake of the Global Pandemic. The COVID-19 virus will shape and leave its mark on our lives forever, the ‘new normal’ is being created before our eyes. This will not only affect our lives on a personal level but the future of architecture, the way we approach our living and working spaces. We must ensure that the health and wellbeing of the occupants is of paramount importance.

Ventilation is not only a legal foundation set-out in Part F of the Building Regulations; in the wake of corona virus this has now become fundamental in minimising the transmission of virus’ and microscopic particles in all indoor spaces. Despite for years us knowing the physiological impact of poor air quality; with asthma cases rising in children, lung and heart diseases directly attributable to polluted air. The fact this is usually a slow and undetectable trigger, has meant its been easy to overlook and ignore. That situation is definitely changing for the better.

We understand that good ventilation is one of the ways that we can reduce the concentration of the virus in the air which minimises the risk of airborne transmission. Ventilation provides good air quality into the building. Fresh outside air expels the polluted inside air using principles of supply, transfer and extraction. Renson’s own Invisivent is a thermally broken trickle vent, installed on top of the window frame, whether it be aluminium, timber or PVC. This almost ‘invisible’ installation guarantees maximum light penetration as the glass size is not reduced. The Invisivent incorporates a self-regulating flap, which ensures the supply of fresh air without draughts. The product range provides sound absorption up to 48dB, ideal for urban environments. Finally, it has a weather-cap option to ensure no water-ingress in exposed locations.

Renson Product in Placement


The Invisivent is not just a window vent, they can be used in curtain wall facades too, incorporated via single unit solutions into the façade. Our first major project of this kind Providence Tower in London, located the Invisivent behind a perforated façade panel, providing effective, sustainable, low energy, low cost ventilation. Additionally, that essential acoustic attenuation that is so vital for the comfort and wellbeing of the occupant. A hidden vent solution works well in these unitised and curtain wall buildings. By creating these single unit solutions, Renson provides safety by design, offsite manufacture to ensure quality watertight, airtight solutions, enabling our construction partners to reduce the installation and complication on site. Most importantly, Renson will also become the missing link between the construction packages, taking on the responsibility of performance via rigorous testing and certification.

Providence tower

Book a Renson CPD

Renson has created a RIBA Accredited CPD that explores ventilation strategies within mid-high rise residential apartments, discussing further the physiological benefits of ventilation. With advice on how to meet performance criteria and create an optimal balance between air quality, thermal, visual and acoustic comfort via a combination of natural ventilation, MVHR, purge ventilation and external sun protection. These concepts also lend themselves to mixed-use, commercial, student accommodation, hotels and health-care projects.

For more information or to book in with the Renson specification team click here or email cpd@rensonuk.net