Spiro International SA – Leading Machine Solution Provider with Swiss Quality. Our business principle is to support the improvement of indoor air quality by providing machines and solutions used to produce economical and environmentally-friendly air duct systems. Spiro International SA is the undisputed world leader in the development and manufacture of machines for the production of air duct systems required in the HVAC and sheet metal industry. Our identity as a Swiss quality brand stands for reliability, security and trust. As the inventor of the spiral duct machine - the so-called Tubeformer - we have built a sound reputation in the HVAC and sheet metal industry over the last six decades. With thousands of high-quality sheet metal machines delivered across the globe, we have developed a strong relationship with our customers - worldwide.