Aerotech Fans
Loading industrial-grade components...
Aerotech Fans
Loading industrial-grade components...
Engineering answers to the most common questions about industrial ventilation, air handling, and pollution control systems.
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.
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.
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.
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.
While 304 stainless steel resists general oxidation, it is highly susceptible to chloride pitting in salt-spray environments. 316L Stainless Steel contains molybdenum, which drastically increases its resistance to chloride corrosion, making it mandatory for marine and offshore ventilation systems.
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.
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.
For luxury hotels and hospital wards, the Fan Coil Unit (FCU) must not exceed a Noise Criteria (NC) rating of NC-30 to NC-35 at maximum RPM. Achieving this requires internally lined acoustic foam chassis, vibration-isolated mounting brackets, and electronically commutated (EC) motors.
A bleed-in (or dilution) damper is an automated safety valve installed upstream of a high-temperature baghouse. If the exhaust gas temperature spikes dangerously close to the melting point of the filter bags, the damper rapidly opens to draw in cool ambient air, quenching the gas stream instantly.
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.
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.
