What is acoustic ventilation?

Opening up the windows, doors and ventilators in our homes allows us to enjoy fresh air and natural light. Along with fresh air, however, we also let in unwanted noise through the open windows and doors. The concept of ‘acoustic ventilation’ is based on allowing free and unrestricted entry to fresh air into built-up spaces for better circulation, while keeping noise out. This also describes the technology behind all Silenceair International products.

The importance of fresh air

Fresh air is important for our physical and mental well-being, energising us in our interior spaces and keeping us alert by eliminating lethargy and drowsiness that can come from lack of sufficient oxygen in a closed space. In damp or enclosed spaces, fresh air displaces unpleasant smells and helps to dry out the environment.

External noise is typically controlled by keeping doors and windows closed. Since natural ventilation is blocked, we rely on noisy air-conditioning units to circulate air. The resulting stale air is unhealthy to occupants as it leads to a build-up of moisture and encourages the growth of mould and bacteria. Additionally, in closed spaces, modern furnishings and painted surfaces can emit toxic fumes, which will accumulate without adequate ventilation, causing various respiratory health problems.

How Silenceair acoustic vents work

Silenceair products are ‘passive acoustic ventilators’, with ‘passive’ referring to the fact that they can operate without electricity. Open-ended tubes called ‘acoustic attenuators’ sit at the core of all Silenceair products to allow air to pass freely, while channelling and redirecting sound waves in such a way that the waves cancel themselves out, significantly reducing the transmission of noise through the ventilation passage.

Silenceair vents utilise the pressure difference between the outside and inside of the building to work effectively. A simple breeze is usually enough to create this differential. Even bathroom or kitchen exhaust fans and passive thermal chimneys can draw air into your building through the Silenceair vent. The vent reduces noise even if there is very little air moving through the unit. But Silenceair is most effective in noise reduction when there is increased volume of air moving through the vent. In extremely windy or cold conditions, the sliding cover on the inside of the vent can be closed to reduce the airflow.

Keeping the solution natural

There’s no doubt that noise pollution impacts the quality of life for occupants in a building. Existing noise reducing solutions compromise our access to natural fresh air and light in built environments.

Silenceair products present an environmentally responsible, technically sophisticated and aesthetically pleasing solution to ventilation and noise management challenges. A breakthrough in sustainable building design, passive acoustic ventilators are being embraced by architects, builders and home renovators around the world.


Silenceair products are recommended for sound and ventilation management in diverse built-up environments. These include residential apartments in noisy locations for fresh air and cross ventilation; office towers for façade ventilation and ceiling voice ventilation; office and meeting room relief ventilation for acoustic privacy; classroom ventilation to keep the noise in or out; sound studios, nightclubs and music rooms to keep the noise in; and factories for ventilation and stopping noise pollution in local areas.

Technical advantages

Silenceair products are easy to install and space efficient with a single 230mm Silenceair vent equivalent to 3,000mm fibreglass ducting; offer simple maintenance as the passive acoustic ventilators can be washed unlike foam and fibreglass ducting; eliminate sick building syndrome with no dirt and bio-film formed; will last the life of the building with no need for replacement; can maintain optimal performance for life; ensure safety for building occupants with no cancer causing fibres; and are strong and robust in construction for durability.