
125 mm Flush-Mounted Round Ceiling Diffuser
Invisible frameless diffuser with antibacterial coating
This frameless plaster-in diffuser ensures invisible and efficient air distribution in any interior. Made of stainless steel with an antibacterial QUALICOAT coating, it is reliably mounted in plasterboard ceilings and is ideal for both air supply and extraction.
Invisible design
The frameless plaster-in body blends completely with the ceiling, ensuring perfect room aesthetics.
Antibacterial coating
UV-resistant QUALICOAT paint guarantees a hygienic and long-lasting surface.
Universal adjustment
The included damper allows for precise flow balancing, and removing it can increase the air volume.
Why choose this plaster-in diffuser?
This frameless round diffuser offers a perfect synthesis of functionality and aesthetics. Designed for smooth air supply and exhaust, it ensures quiet and even air distribution in the room. The stainless steel body guarantees reliability, while the included removable balancing damper allows full control of the ventilation system. If higher air throughput is needed, the damper can simply be removed.
Design and interior compatibility
This model is designed for those who appreciate minimalism and do not want engineering solutions to disrupt the ceiling design. After finishing and plastering works, the diffuser becomes an almost imperceptible part of the ceiling with no protruding frames. The white (RAL 9016) semi-matte surface is coated with special QUALICOAT quality paint, which is UV-resistant and has antibacterial properties. It is a perfect solution for modern homes, hotels, and offices.
Complete ventilation system
Efficient ventilation requires carefully matched components. This device perfectly matches flexible or rigid ducts and heat recovery units, helping to maintain optimal system balance. ORO Haus specialists are always ready to help you choose the most suitable solutions for your perfect home climate.
Key specifications
Below is the most important technical data to help you ensure this device is suitable for your interior and ventilation system.
| Parameter | 100 mm | 125 mmSelected |
|---|---|---|
| Material | Stainless steel with QUALICOAT coating | Stainless steel with QUALICOAT coating |
| Mounting type | Ceiling, flush / plaster-in | Ceiling, flush / plaster-in |
| Air direction | Supply / Extract (Bidirectional) | Supply / Extract (Bidirectional) |
| Adjustable flow | Yes (removable damper) | Yes (removable damper) |
| Duct diameter | 100 mm | 125 mm |
Dimensions
The diffuser is adapted for standard duct systems and plasterboard ceilings.
| Parameter | 100 mm | 125 mmSelected |
|---|---|---|
| Outer diameter | 200 mm | 200 mm |
| Connection diameter | 100 mm | 125 mm |
Airflow data
Proper airflow selection guarantees comfort and ensures optimal air exchange in the room.
| Parameter | 100 mm | 125 mmSelected |
|---|---|---|
| Recommended airflow | 45 m3/h | 55 m3/h |
The installation of a flush frameless diffuser requires care, as it is integrated directly into the plasterboard ceiling during the finishing stage.
Mounting preparation
Cut a hole in the ceiling of the appropriate diameter for the duct connection (100 mm or 125 mm). Attach the included mounting brackets to the plasterboard.
Duct connection
Connect the ventilation system duct to the diffuser spigot. Ensure system tightness and use reliable fixing materials.
Diffuser installation and finishing
Insert the diffuser body into the prepared place. The outer frame of the diffuser must be plastered together with the ceiling. After plastering and painting, only the central round part and the air gap will remain visible.
Airflow adjustment
Before starting to use the system, adjust the airflow using the internal balancing damper. If maximum airflow is required, this damper can be removed.
Cleaning and maintenance
Thanks to the special antibacterial coating, device maintenance is minimal. Remove the central cover and wipe the dust with a damp, soft cloth.

Complete your ventilation system
Combine this device with our flexible ducts, silencers, and heat recovery units. By choosing everything from one source, you will ensure full system compatibility and maximum performance.
Frequently Asked Questions
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