Aerotech Fans
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Technical answers to common questions about industrial fans.
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.
Unlike ducted fans that run continuously, jet fans utilize Demand Control Ventilation (DCV). By linking the jet fans to Carbon Monoxide (CO) sensors, the fans only activate and ramp up via VFDs when toxic gas levels rise, saving up to 60% in annual brake horsepower consumption.
Blade Pass Frequency (BPF) is calculated by multiplying the fan's RPM by the number of impeller blades, then dividing by 60. Identifying the BPF is critical for acoustic engineers to design perfectly tuned cylindrical silencers that attenuate the exact tonal noise generated by the fan.
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.
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.
Marine engine room tube axial fans require a minimum IP56 or IP66 motor rating to survive continuous salt-spray and moisture ingress. The motors must be Totally Enclosed (TEFC or TENV) and the casings should be hot-dip galvanized or marine-grade aluminum.
Because jet fans operate at extremely high discharge velocities to create thrust, they generate significant aerodynamic noise. Cylindrical silencers lined with acoustically transparent perforated metal and high-density mineral wool are mounted upstream and downstream to meet stringent urban Noise Criteria (NC).
Unlike standard ducted ventilation fans which are measured in volumetric flow (CFM or CMH), the performance of an impulse jet fan is measured strictly by its aerodynamic thrust output, rated in Newtons (N), which dictates its ability to entrain and push surrounding ambient air.
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 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.
A washdown-duty roof extractor is engineered for food and beverage plants requiring aggressive daily sanitation. It features IP69K-rated encapsulated motors and 316L stainless steel, crevice-free housings to withstand high-pressure, high-temperature chemical hosing without harboring bacteria.
Yes, bifurcated fans can be mounted both vertically and horizontally. However, if mounted horizontally, the fan must be rotated so the motor compartment sits strictly at the 3 o'clock or 9 o'clock position to ensure proper ambient cooling and prevent bearing damage.
