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.
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.
Aluminum and titanium dust are highly reactive and possess extreme Kst (explosion severity) values. Using a dry baghouse for these metals invites catastrophic deflagration. Wet scrubbers safely mitigate this risk by immediately encapsulating the volatile metal dust in water, suppressing any spark or explosion potential.
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.
Biomass boilers generate exhaust laden with sticky tar and creosote. If this accumulates asymmetrically on the Induced Draft (ID) fan impeller, it causes violent mechanical imbalance. These fans require radial-blade impellers to resist buildup, and often feature automated casing wash-nozzles to continuously strip the tar.
For highly acidic environments where FRP (Fiberglass Reinforced Plastic) lacks the necessary structural integrity, steel impellers and casings must be coated with baked Phenolic epoxy, PTFE (Teflon), or Halar (ECTFE). These coatings create a seamless, impermeable barrier against aggressive chemical vapors.
Maximum Achievable Control Technology (MACT) standards set by the EPA require facilities emitting Hazardous Air Pollutants (HAPs) to achieve a baseline of 95% to 99% Destruction and Removal Efficiency (DRE). Packed bed wet scrubbers achieve this by utilizing automated chemical dosing to maintain precise pH levels, ensuring continuous neutralization of acidic HAPs.
OSHA mandates that employers must keep welder exposure to hazardous metals (like Hexavalent Chromium and Manganese) below the Permissible Exposure Limit (PEL) of 5 micrograms per cubic meter over an 8-hour shift. This requires local source capture extractors equipped with HEPA filtration rather than simple dilution ventilation.
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.
Adding a wet scrubber (Ecology Unit) requires evaluating the existing ductwork and fan static pressure. Wet scrubbers induce a significantly higher pressure drop than dry ESPs, typically requiring the exhaust fan to be upsized or the motor replaced to handle the new aerodynamic resistance.
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.
In extreme climates where cooling 100% hot outdoor air requires massive chiller tonnage, an enthalpy heat recovery wheel typically recovers 60-80% of the energy. This aggressive reduction in the required cooling load usually results in an ROI (payback period) of 12 to 18 months.
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.
