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.
According to IMC (International Mechanical Code), the fresh air intake for a Make-Up Air unit must be located a minimum of 10 feet horizontally from the kitchen exhaust fan discharge to prevent short-circuiting and drawing toxic grease and smoke back into the building.
The lifespan of activated carbon in a kitchen exhaust scrubber ranges from 3 to 12 months, highly dependent on the cooking volume and the efficiency of the upstream Electrostatic Precipitator (ESP). If the ESP fails, grease will instantly blind the carbon's micropores.
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.
Chemical packed bed scrubbers utilize random packing media, most commonly Pall rings, Raschig rings, or Intalox saddles. Fabricated from Polypropylene (PP) or PVDF, these shapes maximize the wetted surface area for gas absorption while minimizing aerodynamic pressure drop.
To neutralize Sulfur Dioxide (SO2) in a wet scrubber, the recirculating water is typically dosed with an alkaline reagent such as Sodium Hydroxide (Caustic Soda, NaOH) or Calcium Carbonate (Limestone), which reacts with the SO2 to form harmless aqueous salts.
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.
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.
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.
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.
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.
The cyclone body itself has no moving parts and requires no electricity. However, the system requires a high-pressure centrifugal blower to overcome the cyclone's aerodynamic pressure drop (typically 3 to 6 inches of water gauge) and maintain the high-velocity vortex.
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.
