todays undisputed world leader in the development and manufacture of machines for the production of round ducting and fittings in sheet metal, mainly for the ventilation industry. spiro is also a leading supplier of fittings and system solutions for the ventilation and air-conditioning industry. with 80 percent of the world's round ventilation components produced on spiro machines, the facts speak for themselves. spiro is truly the company to rely on when it comes to solutions concerning round ventilation systems. this is why users of spiro machines are found on all five continents.