Overall face size 295mm x 295mm (150mm x 150mm neck size)
2-Way Diffuser - Opposed Blade Design -
Overall face size 370mm x 370mm (225mm x 225mm neck size)
Overall face size 445mm x 445mm (300mm x 300mm neck size)
Overall face size 520mm x 520mm (375mm x 375mm neck size)
Overall face size 595mm x 595mm (450mm x 450mm neck size)