Technical specificationsX
Volume flow 1 3) 2 Pa at 7 m³/h
Volume flow 2 3) 4 Pa at 10 m³/h
Volume flow 3 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


(1-9, a-g) For further information on the technical data specifications click here.

The ALD-S: Sound-optimised outer wall air vent

Serie Zuluftelemente

The ALD-S is an outer wall air vent. Outer wall air vents are used as passive air diffusers for living rooms and bedrooms. They are mainly used in combination with the exhaust air units of the Silvento range. These extractors create a constant negative pressure that transports fresh air into the house via the outer wall air vents.

Special features

The ALD-S is an outer wall air vent for high sound insulation requirements. It consists of four star-shaped sound absorbing elements and two sound absorbing rings. The new flexible material made of granulate is a composition of technical foams which, due to the manufacturing process, achieve a high specific weight while maintaining high flexibility. This makes it possible to achieve sound insulation values that were not previously possible.


The insert is fitted into the round duct 9/R 160 (ø 160 mm). The electrical connection is not required, as the ALD-S is a passive supply air element.

The comfort in the living rooms depends to a large extent on the positioning and condition of the outer wall air vents. Therefore, the installation position must be carefully planned. If the incoming air is heated as quickly as possible and outside the occupied zone, there is no risk of draughts. Therefore, an optimal arrangement of the ALD in relation to the heating surfaces is necessary.


Our outer wall air vents ensure user-independent ventilation in accordance with DIN 1946-6 when planned in accordance with the standards.

Art.-no. 41133


Information on the technical data

All ALD sound insulation values at a glance


Experience the ALD in our virtual home: LUNOS living