Plastic flexible pipe package with components for central exhaust air ducting for installation in concrete (within the thermally insulated building shell also in riser shafts, hollow walls and double ceilings). The package includes collection boxes, exhaust air housings, ventilation grilles or exhaust air valves, the flexible ventilation pipe and an assembly set. Project-related package, the contents of which are defined by ventilation planning. All the necessary material is included. Residential units up to 110 m²
