http://www.kaviflex.com/en/products/indoor-doors/fire-door These are the Kaviflex’ Fire Doors, that can have different formats: pivoting, sliding, vertical or guillotine. They come in fireproof panels and are equipped with electromagnets that, in the event of a fire, will close the door by means of a counterweights system. Using the best materials with high-quality standards and having surpassed the most exhaustive test on the industry, they are perfect for in areas with special demands on fire protection.