Guide
Choosing a concealed diffuser is a balance of two things: the ventilation duty it has to perform, and the design it has to disappear into. Get either wrong and the result disappoints — an outlet that is quiet and invisible but undersized, or perfectly sized but visually intrusive.
This guide walks through the decisions in the order that matters, for anyone specifying diffusers on a premium project in Thailand.
Begin with what each room needs: how much air, supplied or extracted, and where it should enter or leave. This comes from the HVAC design and sets the minimum the diffuser must deliver. It is the non-negotiable half of the decision — the finish only matters if the ventilation works.
Different rooms have different priorities: a bedroom values quiet, a bathroom needs reliable extract, a living area may need several positions. Map these before looking at products.
With the duty understood, choose the form that suits the ceiling: a round or square point (RONDO / KVADRO) for a single discreet outlet, or a linear slot (LINEO / LINEO PRO) for a continuous architectural line. This is where design intent leads — the shape you can see is the shape that has to belong in the room.
Our RONDO vs LINEO guide covers this comparison in detail.
Finally, check the practical constraints: the ceiling or wall build-up must have room for the diffuser body and duct connection, and the duct size must match the model. Low ceilings and shallow voids narrow the options, so confirm these early with your HVAC contractor rather than at ordering.
Across the whole ERGOVENT range some things are constant, and some are model-specific:
| Concealed & frameless | Yes — every model |
|---|---|
| Paintable finish | Yes — every model |
| Supply & extract | Supported across the range |
| Installation | Flush in plasterboard ceilings or walls |
| Airflow & dimensions | Confirmed per model and configuration |
| Duct connection | Confirmed per model and configuration |
Model-specific figures are confirmed against current manufacturer documentation for your exact configuration before ordering.
When to use it
Match the model to the supply or extract duty each room needs.
Point diffusers for single rooms, linear slots for larger or detailed ceilings.
Confirm the ceiling build-up and duct size accommodate the model.
Let the visible detail — point or line — suit the room's design.
Before you order
Concealed diffusers are specified against the project, not from a shelf. Confirm these before ordering:
All technical data must be verified against the current manufacturer documentation for your specific configuration before specification and installation.
Products
Round concealed point diffuser — a discreet circle of air, flush with the surface and painted to match.
Best for: Round ceiling or wall integration — renovations and room-by-room ventilation.
Concealed linear slot diffuser — ventilation as a single clean line across the ceiling.
Best for: A linear, minimal ceiling detail in living spaces and suites.
Premium concealed linear diffuser for projects where the ceiling detail is part of the design.
Best for: Advanced linear detailing for design-led villas, hotels and workspaces.
Send your ceiling plans and duct sizes and our Thailand team will recommend the right models, confirm the configuration and prepare a quotation.