The system selected for this project provides outstanding effluent dilution and high discharge velocities to effectively eliminate the potential for exhaust vapors to re-enter the building. The effective stack height was determined to be 38ft above the roofline under prevailing wind velocity conditions of 15 MPH.

A mixing plenum just above the roofline introduces unconditioned outside air as required to maintain constant duct pressure and minimum discharge velocities over a wide load range. This permits the use of more economical VAV fume hood makeup air systems without compromising exhaust system integrity Motorized dampers, sensors. and controls provide automatic compensation for load changes as well as alarm annunciation.

The fan assembly includes a direct-drive chemical-duty motor, which is located outside of the air stream for maximum longevity. Motor bearings are rated for 200,000 hours (20 years) of operation.