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.
A Barometric Relief Damper is a gravity-operated pressure valve used in tightly sealed buildings. When the HVAC system brings in high volumes of fresh outside air, internal pressure rises. The barometric damper automatically swings open to relieve this excess static pressure, preventing doors from becoming stuck.
Electronically Commutated (EC) motors have integrated microprocessors that continuously output rich telemetry via Modbus. The BMS can actively monitor real-time RPM, precise power consumption (Watts), internal stator temperature, and fault codes, enabling a fully digitized, smart-building HVAC architecture.
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.
To retrofit Demand Control Ventilation (DCV), you must install optic smoke sensors and temperature probes inside the existing canopy, and connect them to a new VFD wired to the Exhaust Air Unit (EAU). The system will automatically modulate the fan speed based on real-time cooking loads.
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.
Pre-coating is the injection of a chemically inert, porous powder (like agricultural lime or specialized pre-coat compounds) into the baghouse before introducing the actual process dust. This establishes an initial protective dust cake, preventing sticky or sub-micron process particulates from immediately bleeding through and permanently blinding the virgin filter bags.
Heavy welding processes generate live sparks that can easily ignite dry HEPA filters. Fume extractors utilize metallic baffle spark-arrestors at the primary intake. These baffles force the airstream into sudden, rapid directional changes, causing the heavy, glowing embers to lose momentum and drop into a safe collection tray before reaching the filter media.
An ATEX certified centrifugal blower requires an explosion-proof motor, anti-sparking brass or aluminum rub-rings around the impeller inlet, and a fully grounded carbon steel or stainless housing to prevent static discharge in explosive gas or dust environments.
Jet fan spacing is determined by the fan's throw distance and thrust rating. Typically, fans are spaced 15 to 25 meters apart in parallel rows, ensuring the aerodynamic throw profile of one fan successfully entrains air and hands it off to the intake zone of the subsequent fan.
Before energizing an ID fan, commissioning engineers must verify that the casing expansion joints are unpinned, the cooling water flow to the journal bearings is established, and the inlet dampers are fully closed to prevent an electrical overload during the high-inertia start-up phase.
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.
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.
