Helicoidal extraction towers tow-air EEC are the ideal solution where big air loads at low pressure are required. They are composed of helicoidal rotors with wing-profile high-yield shovel. 

An overpressure shutter can be installed to avoid air income when the tower is not working. 

They are made of weatherproof materials and installation is made easier thanks to a series of standard upstands in polyester resin PRVF or metal for plane roofs, curved and coupling roofs with covering sheets.