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.
Industrial Air Handling Units are typically engineered for a chilled water Delta-T (temperature differential) of 10°F to 12°F (e.g., entering at 44°F and leaving at 54°F). Maintaining this exact Delta-T ensures the coil effectively strips latent heat (humidity) without causing the central chiller plant to operate inefficiently (Low Delta-T syndrome).
Pneumatically conveying paper trim or corrugated cardboard requires a specialized material handling centrifugal blower with an open radial-blade or 'chopper' impeller. Standard backward-inclined impellers will instantly clog and stall when exposed to long, stringy, or sticky trim waste.
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.
While an enthalpy wheel recovers general moisture for comfort cooling, an active desiccant dehumidification wheel utilizes a highly reactive silica gel matrix and a heated regeneration sector to aggressively strip moisture from the air, achieving the ultra-low dew points required for lithium-ion battery or pharmaceutical manufacturing.
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.
Aerodynamic surge occurs when system resistance pushes the blower beyond its stall point, causing violent, oscillating airflow reversals. It is prevented by ensuring the system operates to the right of the surge curve, or by installing an automated bleed-off bypass damper to artificially maintain minimum flow.
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.
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.
Because the Venturi throat accelerates gas to extreme velocities, the throat walls are subject to severe abrasive erosion. Maintenance involves periodic ultrasonic thickness testing of the throat walls and replacing the internal silicon carbide or ceramic wear liners before structural failure occurs.
For highly abrasive airstreams containing cement clinker or boiler fly ash, impellers must be fabricated from abrasion-resistant alloys like Hardox 400/500 steel, or heavily coated with tungsten carbide, to prevent rapid blade erosion and fatal fan imbalance.
Water pooling around an AHU is almost always caused by a blocked condensate drain line or an improperly trapped drain pan. Because the blower creates negative pressure inside the cabinet, the drain must feature a P-trap with sufficient depth to overcome the static pressure and allow water to exit.
PVC eliminator plates in an Air Washer should be pressure-washed quarterly. If biological slime (algae) or mineral scaling builds up on the zig-zag profiles, it drastically increases static pressure drop and allows nuisance water droplets to carry over into the supply ductwork.
