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 Rw43 by adjusting the thickness of the glass and glazing rebate.
Acoustic trickle vent
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.