The soundproof optimised ALD-S

Highest possible sound insulation

The ALD-S consists of four star-shaped silencers, a sound reflector and two sound insulation rings. The stainless steel sound reflector provides the highest possible sound insulation possible in these volume flow ranges. This means that an additional sound insulation inner or outer screen is no longer necessary and is also not recommended by LUNOS. ... learn more


The ALD-S serves as a passive supply air element for living and sleeping rooms. In combination with the LUNOS exhaust air units, such as Silvento ec, a constant negative pressure is created by the base load operation in the bathroom and/or kitchen, which ensures that fresh air is transported into the house via the ALD-S - completely without disturbing noise from outside.

New flexible material

The new flexible material made of granules is a composition of technical foams which, due to the manufacturing process, achieve a high specific weight while maintaining high flexibility. As a result, sound insulation values can be achieved that were previously not possible in this way.


The insert is inserted into the wall-tube 9/R 160 (ø 160 mm). The electrical connection is not necessary because the ALD-S is a passive supply air element.

Please follow the installation instructions and have the ALD-S installed professionally.

Technical specifications
Volume flow 1 2 Pa at 7 m³/h
Volume flow 2 4 Pa at 10 m³/h
Volume flow 3 8 Pa at 15 m³/h
Standard sound level difference Dn,W,open 70 dB at 500 mm wall thickness, 9/IBE, LUNOtherm-S
Standard sound level difference Dn,W,open 64 dB at 500 mm wall thickness, 9/IBE, 1/HWE
Standard sound level difference Dn,W,open 55 dB at 360 mm wall thickness, 9/IBE, 1/WE180
Minimum installation length 180 mm