Aerotech Fans
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Engineering answers to the most common questions about industrial ventilation, air handling, and pollution control systems.
Cyclone dust collectors are highly efficient at capturing coarse, heavy particulates larger than 10 microns. For sub-micron dust, the cyclone must be used as a primary spark-arrestor or pre-filter, followed by a secondary baghouse or wet scrubber.
An enthalpy wheel is a rotating desiccant-coated matrix that transfers both sensible heat (temperature) and latent heat (humidity) between the hot incoming fresh air and the cold exhaust air, recovering up to 80% of the HVAC energy that would otherwise be wasted.
Electronically Commutated (EC) motors are brushless DC motors that maintain peak electrical efficiency across their entire variable speed range. They consume up to 50% less power than traditional AC motors and operate with drastically lower acoustic noise, making them ideal for commercial FCUs.
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.
In cement and steel plants, abrasive fly ash and clinker dust act like sandblasting media against the internal casing of the Induced Draft (ID) fan. To mitigate this, the scroll casing must be lined with replaceable Hardox wear plates or cast basalt tiles at the points of highest aerodynamic velocity.
Explosion vents on a dust collector are sized strictly according to NFPA 68 standards. The calculation requires the Kst value (explosive severity) and Pmax (maximum pressure) of the specific dust, matched against the total internal volume of the baghouse housing.
A fluid coupling is a hydrodynamic transmission device used on massive ID fans to provide a soft start. It utilizes hydraulic fluid shear to smoothly accelerate the heavy impeller, eliminating the extreme mechanical shock and inrush current associated with Direct-On-Line (DOL) starting.
No, a standard jet fan is for CO dilution only. For smoke extraction during a vehicle fire, the jet fan must be strictly rated for High-Temperature (e.g., 300°C for 2 hours or 400°C for 2 hours) to comply with international fire life safety codes like EN 12101-3.
A fire damper is a passive fire protection device installed where AHU ductwork passes through fire-rated walls. If duct temperatures exceed a critical limit (usually 72°C or 165°F), a fusible link melts, snapping the damper shut to prevent fire from spreading through the HVAC system.
A bifurcated fan is required when extracting highly corrosive gases, acidic vapors, or extreme-temperature exhaust (up to 200°C). The bifurcated casing physically isolates the electric motor from the hazardous airstream, preventing catastrophic winding failure.
Two-Stage Indirect/Direct Evaporative Cooling (IDEC) uses a sensible heat exchanger in the first stage to drastically cool the recirculated air without adding any moisture. The direct evaporative stage only engages outside the data center envelope, preventing internal humidity spikes.
Cleanrooms classified as ISO 5 (Class 100) or cleaner strictly require terminal HEPA or ULPA filtration mounted directly in the ceiling grid. Centralized HEPA filters in the AHU are insufficient for these classes due to the risk of particulate shedding within the downstream ductwork.
