The Halo-Vent ventilated chest seal from MDI is used in emergency situations involving lung injuries or pneumothorax. The chest seal is a special dressing applied to the wound to prevent air from entering the chest cavity and to reduce pressure on the lungs. At the same time, the integrated valve allows air that has already entered to escape. The chest seal consists of an adhesive film that is airtight and waterproof. It is applied directly to the wound and forms a barrier that prevents air from entering the chest cavity. This reduces pressure on the lungs and makes breathing easier. Applying a chest seal requires specialized knowledge and should be performed by trained medical personnel or first responders. It is important to follow the instructions carefully to achieve the best possible results.