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.
No, a standard jet fan is for CO dilution only. For smoke extraction during a vehicle fire, the jet fan must be strictly rated for High-Temperature (e.g., 300°C for 2 hours or 400°C for 2 hours) to comply with international fire life safety codes like EN 12101-3.
Instead of firing compressed air on a continuous timer, Pulse-on-Demand uses a differential pressure transmitter (like a Photohelic gauge). The PLC only fires the pulse-jet valves when the dust cake resistance crosses a specific threshold, drastically reducing compressed air consumption and extending filter bag life.
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.
Destruction and Removal Efficiency (DRE) is the mathematical percentage of a specific pollutant that is successfully captured or neutralized by the scrubber system. It is calculated during EPA stack testing by comparing the exact mass flow rate of the pollutant at the inlet versus the outlet.
While an enthalpy wheel recovers general moisture for comfort cooling, an active desiccant dehumidification wheel utilizes a highly reactive silica gel matrix and a heated regeneration sector to aggressively strip moisture from the air, achieving the ultra-low dew points required for lithium-ion battery or pharmaceutical manufacturing.
Explosion vents on a dust collector are sized strictly according to NFPA 68 standards. The calculation requires the Kst value (explosive severity) and Pmax (maximum pressure) of the specific dust, matched against the total internal volume of the baghouse housing.
Building Management Systems (BMS) typically trigger jet fans to activate at a low speed when Carbon Monoxide (CO) reaches 25 ppm, and ramp up to full emergency dilution speed when concentrations hit 35 to 50 ppm, ensuring safe breathable air without wasting continuous electricity.
Dual enthalpy sensors measure both the temperature and humidity of the outside air versus the return air. When the outside air is cooler and drier than the indoor air, the BMS opens the outside air dampers to 100%, providing 'free cooling' and completely shutting down the mechanical chillers.
A Variable Frequency Drive (VFD) slows down the motor electrically to reduce airflow. Inlet Guide Vanes (IGV) are mechanical louvers installed at the blower's intake. IGVs pre-spin the air in the direction of impeller rotation, physically altering the aerodynamic performance curve without changing the motor RPM.
Yes, retrofitting standard AC motors with Electronically Commutated (EC) plug fans in an Air Handling Unit (AHU) is one of the fastest ways to improve HVAC energy efficiency. EC motors can reduce AHU brake horsepower consumption by up to 50% during partial load conditions.
Standard carbon steel impellers begin to lose their structural yield strength at approximately 300°C (572°F). For continuous operation above this threshold, the impeller must be fabricated from specialized high-temperature alloys like Corten steel or Inconel to prevent high-RPM centrifugal creep and catastrophic failure.
Industrial Air Handling Units are typically engineered for a chilled water Delta-T (temperature differential) of 10°F to 12°F (e.g., entering at 44°F and leaving at 54°F). Maintaining this exact Delta-T ensures the coil effectively strips latent heat (humidity) without causing the central chiller plant to operate inefficiently (Low Delta-T syndrome).
