Aerotech Fans
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Aerotech Fans
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Engineering answers to the most common questions about industrial ventilation, air handling, and pollution control systems.
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.
An IDEC unit consumes approximately 1.5 to 2.0 gallons of water per hour for every 1,000 CFM of airflow, depending on the ambient wet-bulb depression. While they consume water, the immense savings in mechanical refrigeration electricity (PUE reduction) makes them highly cost-effective.
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 terminal HEPA filter is located at the very end of the ductwork, right at the ceiling diffuser of the cleanroom. This ensures the air is sterilized of 99.99% of particles down to 0.3 microns immediately before entering the occupied zone, preventing contamination from ductwork shedding.
A V-Belt drive decouples the fan speed from the motor's synchronous RPM, allowing engineers to precisely tune the fan's performance curve by changing pulley ratios. It also thermally and mechanically isolates the motor from hot or vibrating fan casings.
Standard Induced Draft (ID) fans are designed to handle continuous flue gas temperatures up to 250°C. For extreme high-temperature applications up to 400°C, the blower must be equipped with water-cooled journal bearings and a shaft cooling wheel to protect the drive arrangement.
Cyclone dust collectors are highly efficient at capturing coarse, heavy particulates larger than 10 microns. For sub-micron dust, the cyclone must be used as a primary spark-arrestor or pre-filter, followed by a secondary baghouse or wet scrubber.
An enthalpy wheel is a rotating desiccant-coated matrix that transfers both sensible heat (temperature) and latent heat (humidity) between the hot incoming fresh air and the cold exhaust air, recovering up to 80% of the HVAC energy that would otherwise be wasted.
Electronically Commutated (EC) motors are brushless DC motors that maintain peak electrical efficiency across their entire variable speed range. They consume up to 50% less power than traditional AC motors and operate with drastically lower acoustic noise, making them ideal for commercial FCUs.
A fluid coupling is a hydrodynamic transmission device used on massive ID fans to provide a soft start. It utilizes hydraulic fluid shear to smoothly accelerate the heavy impeller, eliminating the extreme mechanical shock and inrush current associated with Direct-On-Line (DOL) starting.
A bifurcated fan is required when extracting highly corrosive gases, acidic vapors, or extreme-temperature exhaust (up to 200°C). The bifurcated casing physically isolates the electric motor from the hazardous airstream, preventing catastrophic winding failure.
Two-Stage Indirect/Direct Evaporative Cooling (IDEC) uses a sensible heat exchanger in the first stage to drastically cool the recirculated air without adding any moisture. The direct evaporative stage only engages outside the data center envelope, preventing internal humidity spikes.
