Air diffusers

The selection of a diffuser or grille depends on the building application, room geometry, airflow requirement, and comfort criteria. In offices, schools, hotels, and residential buildings, low sound levels and draught-free air distribution are often key priorities. In industrial buildings, sports halls, and other large spaces, longer throw distances and the ability to handle higher airflow rates may be more important.

The selected product should always provide the required airflow while maintaining good comfort conditions throughout the occupied zone.

Some products are suitable for both supply and exhaust air applications, while others are designed specifically for one function.

Supply air diffusers are developed to introduce fresh air into the room in a controlled and comfortable manner, while maintaining low pressure loss and good acoustic performance. Exhaust air diffusers are designed to remove room air efficiently while supporting reliable airflow measurement and balancing.

The suitability of a product for supply or exhaust operation should always be verified during selection.

Several factors influence diffuser selection, including:

• required airflow rate;
• room dimensions and ceiling height;
• supply air temperature relative to room conditions;
• required throw length and air distribution pattern;
• occupied-zone comfort requirements;
• acoustic criteria;
• pressure loss considerations;
• installation constraints;
• architectural requirements.

A properly selected diffuser contributes to occupant comfort, stable room conditions, and efficient system operation throughout the building's lifetime.

Accurate commissioning requires reliable airflow measurement within the installed ventilation system. Many Airvent commissioning boxes incorporate integrated measuring probes and product-specific K-factors, allowing airflow to be measured and balanced directly at the unit connection. The required K-factor values are available through Airvent Selector, simplifying both balancing and verification on site.

This helps ensure that the installed airflow rates correspond to the original design values and that the ventilation system performs as intended.

Noise can originate from several sources within the ventilation system, including excessive air velocity, high pressure loss, inadequate duct attenuation, or noise transferred through the duct network. The interaction between the diffuser, commissioning box, and duct system also influences the overall acoustic performance.

A properly selected diffuser and commissioning box combination helps create favourable airflow conditions, supports accurate balancing, and contributes to low sound levels throughout the occupied space.

In many cases, the diffuser itself is not the primary source of the problem. Correct dimensioning, proper balancing, and careful acoustic design are essential for achieving low noise levels and maintaining occupant comfort.

Yes. Many supply air diffusers include adjustable blades, deflectors, or nozzles that allow the air pattern to be modified after installation.

Depending on the product type, the throw direction, throw length, and air distribution characteristics can be adapted to suit different room layouts and operating conditions. Some products can be adjusted manually, while others can be equipped with actuators for automatic adaptation to seasonal operating modes or changing airflow requirements.

Commissioning is typically carried out by measuring the airflow and adjusting either the balancing damper in the commissioning box or, for smaller room units, the diffuser's deflector plate until the design airflow is achieved.

Many Airvent commissioning boxes are equipped with integrated measuring probes and verified K-factors, allowing airflow to be measured accurately directly at the commissioning box. The relevant K-factor values are available in Airvent Selector, simplifying both balancing and verification on site.

Ceiling height, room dimensions, and occupancy patterns have a significant impact on air distribution performance.

Products designed for standard office ceilings may not perform optimally in atriums, sports halls, industrial facilities, or other high-ceiling spaces. In such applications, diffusers with longer throw capabilities or adjustable air patterns are often required.

Selecting a product suitable for the specific room geometry helps maintain comfort and effective air distribution.

Most supply and exhaust air products can be cleaned using a soft cloth and a mild cleaning agent. Cleaning intervals depend on the application and the indoor environment.

Regular inspection and cleaning help maintain airflow performance, appearance, and hygiene throughout the product's service life.

Yes. Many products can be supplied in custom colours, dimensions, materials, or configurations to meet architectural or project-specific requirements.

When evaluating custom solutions, both aesthetic and technical aspects should be considered, including airflow performance, acoustics, maintainability, and commissioning requirements.

Airvent products can be selected using Airvent Selector, our online selection software.

The web app provides technical performance data, airflow calculations, pressure loss, sound levels, commissioning information, and product-specific documentation. This helps designers and contractors compare alternatives and select products based on project requirements.