The telescopic wall conduct with exhaust air grille from Hastrag is an efficient solution for ventilating rooms. It is made of high-quality aluminium and offers a durable and corrosion-resistant construction. The single-sided aluminium louvre grille with drip nose ensures effective air circulation, while the rubber-mounted backdraft damper made of galvanised sheet metal prevents the ingress of unwanted air. With an extendable length of 350 to 550 mm, the wall box can be flexibly adapted to different wall thicknesses. The power measurement is carried out in accordance with EN-13141-2 standards, which guarantees reliable functionality. This wall conduct is ideal for applications where controlled exhaust air is required and helps to improve indoor air quality. Extendable from 350 to 550 mm for flexible installation. Rubber-mounted backdraft damper to prevent draughts. Performance in accordance with EN-13141-2 for reliable functionality. High air flow rate of 300 m³/h for effective ventilation.