Aerotech Fans
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Engineering answers to the most common questions about industrial ventilation, air handling, and pollution control systems.
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.
Double-skin Air Handling Units utilize Polyurethane Foam (PUF) injected between two galvanized steel sheets. While primarily designed to prevent thermal bridging, the dense PUF core acts as a massive acoustic dampener, significantly reducing the breakout noise from the high-static centrifugal blowers inside.
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.
A heavy-duty centrifugal blower must be mechanically decoupled from the rigid ductwork using flexible fire-rated canvas or neoprene connections. Without this isolation, the inherent harmonic vibration of the blower will transmit directly into the sheet metal, turning the entire duct network into a massive acoustic amplifier.
Certified commercial smoke spill fans are engineered with Class H motor insulation to operate continuously for either 2 hours at 250°C, or 2 hours at 400°C, depending on the specific local fire-code compliance and building life-safety requirements.
To prevent moisture carryover into the supply ductwork, the maximum face velocity across a standard AHU chilled water coil should not exceed 500 Feet Per Minute (FPM). If spatial constraints require higher velocities, specialized droplet eliminator plates must be installed downstream.
A terminal HEPA filter is located at the very end of the ductwork, right at the ceiling diffuser of the cleanroom. This ensures the air is sterilized of 99.99% of particles down to 0.3 microns immediately before entering the occupied zone, preventing contamination from ductwork shedding.
The air-to-cloth (A/C) ratio dictates the filtration velocity. If the A/C ratio is too high (too much air, too little fabric), the interstitial velocity prevents the dust cake from falling into the hopper during pulsing, causing permanent bag blinding and a massive spike in motor energy consumption.
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.
A V-Belt drive decouples the fan speed from the motor's synchronous RPM, allowing engineers to precisely tune the fan's performance curve by changing pulley ratios. It also thermally and mechanically isolates the motor from hot or vibrating fan casings.
In a fire emergency, preserving human life by maintaining a smoke-free escape route supersedes protecting the equipment. Smoke spill motors are hardwired to bypass all VFDs and thermal overload relays, intentionally running the motor to destruction rather than tripping and allowing the building to fill with toxic smoke.
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.
