The Zehnder ComfoFresh air distribution system supplies indoor spaces with fresh air – Clinside ensures this is done cleanly and hygienically. Clinside, the smooth inner skin in Zehnder ventilation tubes and filters not only reduces the build-up of dust, but also guarantees easy cleaning. Certification by a recognised hygiene institute confirms this. Flexible air distribution pipe, outside ribbed, inside smooth according to DIN EN 60529, gas-tight and stable. The ComfoTube Round can easily be laid in concrete, directly into the earth or in riser ducts and suspended ceilings. The Zehnder ComfoTube can be easily and quickly installed, it consists of new, pure, white HDPE and is delivered in rolls.