Duka Telescopic valve Type 450 Ø99 mm white

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.