Renson THM90
Trickle vent on top of the window frame for a controlled air supply.
- On the frame
Windows & doors / Window ventilation
Windows & doors · ventilation Window ventilation
Fresh air, designed around the window. A controlled supply of fresh air at window level.
- 4 ventsRenson and Duco
- Before productionchosen with the window
- At window levelcontrolled supply
What is window ventilation? A separate choice in your ventilation plan.
Window ventilation is not a C+ or D+ unit. It is a separate way of letting in fresh air at window level — as a stand-alone measure per room or as part of a broader ventilation strategy.
Profile, glazing, acoustic requirement, desired airflow, exposure of the façade and airtightness determine the right vent.
- Chosen together with the window
- Matched to noise and façade
- Stand-alone or with C+ / D+
Window ventilation · Renson THM90Renson · Duco Four vents, one logic.
DucoFlat 80 SR
Flat vent for a clean look, with inserts of 24, 28 or 32 mm.
- 24/28/32 mm inserts
DucoLine 80 SR
Vent with inserts from 20 to 46 mm.
- 20–46 mm inserts
Renson Variavent Flat
Suitable for glazing thicknesses from 19 to 46 mm.
- Glazing 19–46 mm
Installation Vent, frame and glass chosen together.
The vent must be sized and positioned before the window is manufactured and installed.
- 01Opening
Old window removed, reveals and substrate checked
- 02Frame
Fixed level and stress-free
- 03Airtight connection
As important as the glazing: no draughts, no thermal bridge
- 04Finish
Sills and connections inside and out neatly finished
Designed around the window Not around a product label.
- ✓
Can provide a controlled supply of fresh air at window level.
- ✓
Can be considered on its own or together with a broader indoor air strategy.
- ✓
Must be sized and positioned before the window is manufactured.
- ✓
Does not automatically replace the supply or extract of a designed central C+ or D+ system.
Projects Windows we installed.
From a single front door to 214 windows in one apartment project.
26cities in 6 provinces
from Bruges to Namur
Indoors Fresh air, almost invisible.
A vent on top of the frame, in the colour of the window.
Full renovation
Does window ventilation fit your ventilation plan?
C+ and D+ are central systems; window ventilation is a separate choice. We look together at what your home needs.
Questions about window ventilation What our clients ask us.
Does window ventilation replace a C+ or D+ system?
No. A window vent does not automatically replace the supply or extract of a designed central C+ or D+ system.
Can a vent go in my existing window?
The vent is best chosen and fitted before the window is manufactured; with new windows we plan it in straight away.
Which vent should I choose?
Profile, glazing, acoustic requirement, desired airflow and exposure of the façade determine the right vent.
Will I hear more street noise with a vent?
The acoustic requirement is one of the criteria in choosing the vent.
Free site visit · quote within 48 hours Ready for
fresh air?
Our specialist inspects your home and sends you a tailored, no-obligation quote within 48 hours.
- Phone
- +32 333 20 630
- leads@gravagroup.be
- Address
- Sneeuwbeslaan 14, 2610 Wilrijk
Free 3D visualisation with your quote