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.
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.
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.
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.
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.
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.
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.
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.
PTFE (Teflon) membrane filter bags are required when handling highly abrasive dust, sticky/agglomerative particulates, or extreme temperatures up to 260°C. The slick membrane forces surface filtration, preventing dust from penetrating the core fabric and ensuring flawless pulse-jet cleaning.
Chemical packed bed scrubbers utilize random packing media, most commonly Pall rings, Raschig rings, or Intalox saddles. Fabricated from Polypropylene (PP) or PVDF, these shapes maximize the wetted surface area for gas absorption while minimizing aerodynamic pressure drop.
Woodworking generates a mix of heavy chips and fine sawdust. The optimal solution is a two-stage system: a primary Cyclone Dust Collector to drop out the heavy abrasive chips via centrifugal force, followed by a Pulse-Jet Baghouse to capture the hazardous sub-micron respiratory dust.
When equipped with a PTFE-coated HEPA H14 final filter, a welding fume extractor captures 99.995% of sub-micron metallic oxides, keeping Hexavalent Chromium (Cr(VI)) and Manganese exposures well below OSHA's strict Permissible Exposure Limits (PEL).
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).
