Aerotech Fans
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Aerotech Fans
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Technical answers to common questions about air handling units.
IE3 designates Premium Efficiency AC induction motors, while IE4 designates Super Premium Efficiency (often achieved using Permanent Magnet or EC technology). Using IE4 motors in continuous-duty AHUs or FCUs can reduce electrical losses by an additional 15% compared to IE3.
To prevent moisture carryover into the supply ductwork, the maximum face velocity across a standard AHU chilled water coil should not exceed 500 Feet Per Minute (FPM). If spatial constraints require higher velocities, specialized droplet eliminator plates must be installed downstream.
A cleanroom AHU maintains positive pressure by supplying a slightly higher volumetric airflow (CFM) into the sterile core than what is mechanically extracted. High-static centrifugal blowers within the AHU force this excess air outward through airlocks, preventing contaminated ambient air from entering.
Water pooling around an AHU is almost always caused by a blocked condensate drain line or an improperly trapped drain pan. Because the blower creates negative pressure inside the cabinet, the drain must feature a P-trap with sufficient depth to overcome the static pressure and allow water to exit.
