Efficient glazing is fundamental to noise control. Double-glazing is effective at reducing external noise, but the use of thicker glass or different combinations of glass can significantly improve performance.
A standard VELFAC double-glazed unit achieves Rw32, which can be increased to Rw41 by adjusting the thickness of the glass and glazing rebate.

Acoustic trickle vent

Efficient glazing is fundamental to noise control, and fresh air is essential to our wellbeing. 

The VELFAC acoustic vent is designed to provide both fresh air and noise control in buildings when combined with VELFAC SOUND windows.  The vent achieves a sound reduction value of Dn,e,w 40 dB.

The acoustic vent is machined into a timber packer, which will be installed and sealed on site.  The external aluminium profile is polyester-powder coated in the RAL colour to match the sashes.

In the product information sheet you will find the main facts, airflow and test results for the Acoustic trickle vent.