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.
In a draw-through AHU, the fan is located downstream of the cooling coil, placing the coil under negative pressure (requiring a deep P-trap for condensate drainage). In a blow-through AHU, the fan is upstream, pushing air through the coil under positive pressure, which improves air distribution but adds motor heat to the conditioned air.
Double-skin Air Handling Units utilize Polyurethane Foam (PUF) injected between two galvanized steel sheets. While primarily designed to prevent thermal bridging, the dense PUF core acts as a massive acoustic dampener, significantly reducing the breakout noise from the high-static centrifugal blowers inside.
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.
A heavy-duty centrifugal blower must be mechanically decoupled from the rigid ductwork using flexible fire-rated canvas or neoprene connections. Without this isolation, the inherent harmonic vibration of the blower will transmit directly into the sheet metal, turning the entire duct network into a massive acoustic amplifier.
Unlike an enthalpy wheel which requires adjacent ductwork, a run-around coil system uses a pumped glycol loop to transfer heat between two physically separated coils—one in the exhaust duct and one in the fresh air intake. It provides sensible heat recovery with zero risk of cross-contamination.
The Liquid-to-Gas (L/G) ratio is a critical mass-transfer metric that defines the volume of scrubbing liquid injected per unit volume of exhaust gas (usually expressed in GPM per 1,000 CFM). If the L/G ratio is too low, the packing media develops dry spots, causing a catastrophic drop in chemical neutralization efficiency.
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).
If your facility transitions to handling combustible dust, your existing dust collector must be retrofitted with ATEX/NFPA 68 compliant explosion relief vents, a rotary airlock valve for isolation, and anti-static (epitropic) filter bags to prevent catastrophic deflagration.
At high altitudes, air density decreases significantly. A blower operating at 5,000 feet will move the same actual volumetric flow (ACFM) as at sea level, but it will generate far less static pressure and require less brake horsepower. The fan must be specifically derated and upsized to achieve the required standard mass flow (SCFM).
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.
DCV systems utilize optic smoke sensors and temperature probes inside the exhaust hood. Instead of running the exhaust fan at 100% all day, a Variable Frequency Drive (VFD) automatically scales the fan RPM in real-time to match the exact cooking load, saving massive amounts of electrical and Make-Up Air heating costs.
Yes, bifurcated fans can be mounted both vertically and horizontally. However, if mounted horizontally, the fan must be rotated so the motor compartment sits strictly at the 3 o'clock or 9 o'clock position to ensure proper ambient cooling and prevent bearing damage.
