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.
Commercial mechanical codes require the exhaust fan and the Make-Up Air (FAU) unit to be electrically interlocked. If the exhaust fan turns on, the MUA must automatically engage to prevent severe building depressurization. If the MUA fails, the exhaust must shut down.
In a fire emergency, preserving human life by maintaining a smoke-free escape route supersedes protecting the equipment. Smoke spill motors are hardwired to bypass all VFDs and thermal overload relays, intentionally running the motor to destruction rather than tripping and allowing the building to fill with toxic smoke.
A Fan Coil Unit (FCU) uses a 2-way or 3-way modulating PICV (Pressure Independent Control Valve) to strictly regulate the flow of chilled water through the coil based on real-time thermostat demands. This precise throttling prevents overcooling and maintains strict sensible heat ratios in the occupied zone.
Silica dust acts as a highly abrasive sandblasting agent. To prevent the lower cone of the cyclone from eroding, the internal apex and impact zones are often lined with replaceable cast basalt tiles or vulcanized rubber, which absorb the kinetic energy and extend the cyclone's lifespan indefinitely.
By mounting piezoelectric accelerometers on the blower bearings, IoT systems can analyze the fast Fourier transform (FFT) vibration spectrum. A spike at exactly 1x the RPM indicates fan unbalance, while spikes at high frequencies indicate microscopic bearing spalling, allowing maintenance weeks before a catastrophic failure.
While 304 stainless steel resists general oxidation, it is highly susceptible to chloride pitting in salt-spray environments. 316L Stainless Steel contains molybdenum, which drastically increases its resistance to chloride corrosion, making it mandatory for marine and offshore ventilation systems.
According to IMC (International Mechanical Code), the fresh air intake for a Make-Up Air unit must be located a minimum of 10 feet horizontally from the kitchen exhaust fan discharge to prevent short-circuiting and drawing toxic grease and smoke back into the building.
Opposed Blade Dampers (OBD) feature adjacent blades that rotate in opposite directions. Unlike parallel blade dampers which throw air to one side of the duct, OBDs maintain a straight, laminar airflow profile even when partially closed, making them mandatory for precise volumetric balancing in AHUs.
PVC eliminator plates in an Air Washer should be pressure-washed quarterly. If biological slime (algae) or mineral scaling builds up on the zig-zag profiles, it drastically increases static pressure drop and allows nuisance water droplets to carry over into the supply ductwork.
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 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.
The aluminum collector cells in a kitchen ESP must be removed and soaked in a highly alkaline degreasing bath every 1 to 4 weeks depending on the cooking volume. If the collector plates become heavily insulated with grease, they cannot generate the magnetic field required to capture smoke.
