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.
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.
Commercial mechanical codes require the exhaust fan and the Make-Up Air (FAU) unit to be electrically interlocked. If the exhaust fan turns on, the MUA must automatically engage to prevent severe building depressurization. If the MUA fails, the exhaust must shut down.
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.
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 a fire emergency, preserving human life by maintaining a smoke-free escape route supersedes protecting the equipment. Smoke spill motors are hardwired to bypass all VFDs and thermal overload relays, intentionally running the motor to destruction rather than tripping and allowing the building to fill with toxic smoke.
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.
The Approach Temperature is the difference between the cold air leaving the air washer and the ambient wet-bulb temperature. A highly efficient air washer with dense atomization can achieve an approach of 2°F to 3°F, meaning it has evaporated the maximum physical amount of water into the airstream.
ASHRAE Standard 62.1 dictates the absolute minimum ventilation rates for acceptable indoor air quality. Engineers must size the Fresh Air Unit (FAU) by calculating the combined CFM required per person (occupancy load) and per square foot (building area load) to ensure sufficient CO2 dilution without over-ventilating and wasting energy.
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.
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.
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.
