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A ventilation grille is used for air supply, air extraction and the neat finishing of ventilation openings. The grille forms the visible transition between a room, façade, wall or air duct and helps maintain controlled airflow within the ventilation system.
At Hewa, you will find ventilation grilles for installers, service technicians, business customers and DIY users. When selecting the right grille, check dimensions, free air passage, application, mounting position, material type, grille design, duct connection and service-friendly placement.
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Selecting a ventilation grille
A ventilation grille is used to finish air openings neatly and allow controlled air supply or air extraction. The grille can be used in façades, walls, ducts, technical rooms or other ventilation points where visible finishing is required. The right design helps prevent unnecessary air resistance, limits dirt entering the duct and provides a clean transition between the ventilation system and the room.
The right choice depends on dimensions, free air passage, duct diameter, mounting position, material, application and required finish. For the broader category, also review air exhaust material for ventilation. For the duct route behind the grille, ventilation pipe is important. For exhaust air through the roof, roof terminal may be relevant.
Important when choosing ventilation grilles
- Check the dimensions, connection size and free air passage of the grille
- Match the grille to air supply, air extraction or general ventilation
- Check mounting position in façade, wall, duct, ceiling or technical room
- Select a design that suits airflow, noise, resistance and finishing
- Check that the grille connects properly to the pipe, duct or fitting
- Allow for cleaning, accessibility, dirt build-up and maintenance
- Prevent airflow blockage caused by incorrect placement or undersized dimensions
Neat finishing with sufficient free air passage
A ventilation grille has two important functions: finishing the opening and allowing sufficient air movement. If the grille is too small or has too little free passage, air resistance can increase. This can lead to reduced ventilation capacity, additional noise or a less effective air extraction system.
During installation, the grille must connect properly to the ventilation pipe, duct or fitting behind it. Open gaps, poor alignment or angled placement can make the finish less neat and affect airflow. In some applications, protection against rain ingress, dirt, insects or air backflow is also important.
For installers, it is sensible to assess the ventilation grille in combination with the complete ventilation route. Consider duct diameter, airflow, bends, duct length, grille position, cleanability and visible finish. A correctly selected grille contributes to a neat installation, stable air movement and a lower risk of noise or insufficient ventilation.
Frequently asked questions about ventilation grilles
What is a ventilation grille used for?
A ventilation grille is used for air supply, air extraction and neat finishing of ventilation openings in a façade, wall, duct, ceiling or technical room.
Which ventilation grille do I need?
The correct ventilation grille depends on dimensions, airflow, free air passage, mounting position, application and connection to the duct or ventilation system.
Why is free air passage important?
Free air passage determines how much air can flow through the grille. Too little free passage can cause extra resistance, more noise and lower ventilation capacity.
Can a ventilation grille affect noise?
Yes, an incorrectly selected or undersized grille can increase air resistance and cause noise. Choose a grille that matches the required airflow and duct layout.
What should an installer check during installation?
Check dimensions, connection size, free air passage, mounting position, firm fixing, neat sealing, cleanability, duct connection and access for maintenance.