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.
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.
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.
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.
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.
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.
For standard commercial cooking equipment, the exhaust hood must maintain a capture face velocity of 50 to 75 Feet Per Minute (FPM). For heavy-duty solid fuel or charbroiling, the velocity must be engineered closer to 100 FPM to ensure the thermal plume is completely captured.
According to IMC (International Mechanical Code), the fresh air intake for a Make-Up Air unit must be located a minimum of 10 feet horizontally from the kitchen exhaust fan discharge to prevent short-circuiting and drawing toxic grease and smoke back into the building.
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.
The lifespan of activated carbon in a kitchen exhaust scrubber ranges from 3 to 12 months, highly dependent on the cooking volume and the efficiency of the upstream Electrostatic Precipitator (ESP). If the ESP fails, grease will instantly blind the carbon's micropores.
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).
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.
