Energy efficient ventilation products | www.systemair.com ERV, Energy efficient units, ventilation, commercial ventilation, Systemair, Topvex Systemair is a leading ventilation company with operations in 47 countries in Europe, North- and South America, the Middle East, Asia and South Africa. Our range has grown ­substantially to span a wide range of energy efficient fans, air handling units, air distribution products, air conditioning, air curtains and heating products. Our products are robust and easy to choose, install and use.