There exists a common misconception that 'TRI' in
Tri-Stack® equates to three fans. However 'TRI' refers to the unique ability of each individual fan to incorporate three streams of air into a single plume:
1) The first stack comes from the building source itself.
2) The second stack is induced through the wind band. This stack allows the nozzle plume to develop fully before exiting and helps shield it from cross-winds.
3) The third stack is entrained through the teardrop shaped motor cut-outs. The nozzle design allows the motor to remain outside of the hazardous exhaust stream.