Duka Telescopic Valve Type 450 Ø99 mm White - Ventilation - 111835
Complete Telescopic Valve With Extra Sound-insulated Wall Feed-through, Insect Net, External Gray Louvre Grille, Internal White Wall Valve With Cord Pull, Dust Filter And Condensation-insulated Cover. Used For Wall Thicknesses From 260-400 mm. Can be Extended With a 20 cm. Extension Tube. Sound Attenuation in The Closed Position is 62 dB And in The Fully Open Position is 47 dB.