Aerotech Fans
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Aerotech Fans
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Technical answers to common questions about industrial blowers.
For blowers utilizing a flexible coupling (DriveArrangement.COUPLING), precision laser alignment between the motor shaft and the fan shaft is mandatory during commissioning. Even a misalignment of a few thousandths of an inch induces severe radial and axial loads, destroying the bearings and coupling elastomer within weeks.
To ensure proper atmospheric dispersion and prevent hazardous plumes from re-entering the building's fresh air intakes, industrial exhaust stacks must maintain a minimum discharge velocity of 2,500 to 3,000 FPM. This high momentum shoots the plume high above the aerodynamic wake of the roofline.
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, transporting plastic pellets requires dilute phase pneumatic conveying. A heavy-duty centrifugal blower (often SISW with radial blades) can easily generate the required 4,000 to 5,000 FPM duct velocity to keep the lightweight pellets suspended in the airstream without degrading the material.
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.
Aerodynamic surge occurs when system resistance pushes the blower beyond its stall point, causing violent, oscillating airflow reversals. It is prevented by ensuring the system operates to the right of the surge curve, or by installing an automated bleed-off bypass damper to artificially maintain minimum flow.
Rubber (neoprene) isolation pads are sufficient for high-RPM, low-mass fans. However, heavy-duty low-RPM blowers (like Induced Draft fans) require restrained spring isolators. Springs provide the high static deflection required to absorb low-frequency harmonic vibrations that rubber pads cannot dampen.
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).
AMCA 210 is the strict laboratory testing standard that dictates how a fan's aerodynamic performance (CFM, Static Pressure, and Brake Horsepower) is measured. Specifying an AMCA-certified blower guarantees that the fan will actually perform to its published curve on site, eliminating phantom efficiency claims.
To fluidize a cement silo and prevent rat-holing or bridging, low-volume but extremely high-pressure air is injected through aeration pads at the bottom cone. This requires a Single-Stage High-Pressure centrifugal blower or a positive displacement Roots blower capable of overcoming the heavy static weight of the cement column.
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.
For dense phase pneumatic conveying of heavy materials like cement or fly ash, the duct velocity must be maintained between 3,500 and 4,500 Feet Per Minute (FPM). If velocity drops below this threshold, the particulate will fall out of suspension and instantly block the pipeline.
