Aerotech Fans
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Engineering answers to the most common questions about industrial ventilation, air handling, and pollution control systems.
Yes, dust collectors handling organic particulates like flour, sugar, and cornstarch require strict ATEX and NFPA 68 certification. These systems must be equipped with explosion venting panels and epitropic (anti-static) filter media to prevent catastrophic deflagration.
A persistently high differential pressure indicates bag blinding. This occurs when the compressed air header pressure is too low to shatter the dust cake, or if moisture has entered the airstream, turning the dry dust into a sticky mud that permanently clogs the filter media.
For dense phase pneumatic conveying of heavy materials like cement or fly ash, the duct velocity must be maintained between 3,500 and 4,500 Feet Per Minute (FPM). If velocity drops below this threshold, the particulate will fall out of suspension and instantly block the pipeline.
To prevent severe system effect (aerodynamic turbulence that destroys fan efficiency), there must be a minimum of 2.5 to 3 duct diameters of straight, un-obstructed ductwork immediately following the discharge of a centrifugal blower before the first elbow or transition.
A blocked rotary airlock is usually caused by bridging of oversized materials or severe moisture coagulation in the hopper. The system must be locked out, and the access port opened to manually clear the shear-point. Never use compressed air to blow out a jammed rotary valve due to deflagration risks.
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.
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.
Our double-stage high-pressure blowers can generate up to 2500 mm w.g. static pressure by utilizing two impellers mounted in series on a common shaft, effectively doubling the compression capability of a single-stage unit.
A Double Inlet Double Width (DIDW) blower should be chosen when you require massive volumetric airflow (CFM) in a clean-air environment with restricted installation space, such as an HVAC Air Handling Unit. For high-pressure or material handling, an SISW blower is required.
Random packing media, such as Pall rings or saddles, is used to drastically increase the internal wetted surface area of the scrubber column. This maximizes the gas-to-liquid contact time, which is critical for the chemical absorption of toxic gases like ammonia and hydrochloric acid.
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.
Calcium scaling on the packing media occurs when using hard makeup water. It is prevented by strictly managing the blowdown rate to control dissolved solids, and by dosing the recirculating scrubber liquid with antiscalant polymers to keep the calcium suspended in solution.
