Flexible channel ventilation system is designed for private houses, apartments or residential buildings with limited space for ventilation system installation. Flexible channels can be used to renovate buildings if there are no planned areas for recuperation ventilation systems. The outer diameter of the channels is 75 mm, the height of the connection boxes is small, so the system is compact and saves space. Flexible channels can be incorporated into walls, ceilings, floors, insulation, finishing layers or on the outside of the facade, covering them with a thermal insulation layer. The channels are strong enough, so ventilation elements can be placed in a concrete cast. The system is flexible, it can easily avoid unforeseen obstacles. It consists of a small number of elements, does not require special tools, trim details, so the system is not complicated, it is easy and easy to install. The ducts are made of a healthy, non-toxic polyethylene (PE), which can be specially ordered with antistatic and antimicrobial additives. Dust and microorganisms do not accumulate inside the flexible channel. The ventilation system with flexible channels is clean and safe.