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Q
What installation clearance is needed for avionics bays and dense electronics racks?
AA fan installed too close to a board, wall, filter, or bend can lose airflow and create tonal noise. As a first-pass rule, keep inlet and outlet clearance near 1 to 2 fan thicknesses when the enclosure allows it, avoid abrupt duct expansions or contractions, and use turning vanes where airflow must bend sharply. If space is constrained, verify the operating point with the P-Q curve and enclosure impedance rather than assuming the free-air CFM value will reach the heat source.
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Q
How should PWM, FG, and RD signal wiring be reviewed near avionics or RF equipment?
APWM, FG, and RD wiring should be reviewed as part of the electrical interface, not as accessory wiring. PWM control requires a shared reference with the fan negative lead unless an isolation scheme is used. FG and RD outputs are normally open-collector style signals and require the correct pull-up voltage and resistor; they should not be paralleled across multiple fans. In RF-sensitive equipment, harness routing, shield termination, grounding, and CE102/RE102 pre-screening are as important as the nominal signal logic.
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Q
When should I choose a 400Hz AC fan instead of a 28VDC BLDC fan?
AChoose a 400Hz AC fan when the platform already provides 115V phase / 200V line, 3-phase aircraft or shipboard power and the replacement target is tied to that legacy electrical interface. The Titan PCG67JFZY722-63G-AA reference model is a 400Hz AC platform with 22,000 RPM rated speed, at least 140 CFM airflow, and at least 79 mmH2O static pressure. Choose 28VDC BLDC when the system needs PWM speed control, FG/RD feedback, lower-voltage power distribution, or easier integration with digital thermal controllers.
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Q
Which fan materials are best for salt fog, cleanrooms, and airborne weight targets?
AMaterial choice should follow the failure mode. Aluminum alloy housings improve rigidity, heat spreading, and vibration resistance for airborne, naval, and tracked-vehicle systems. PPO or engineered polymer configurations reduce weight and support corrosion resistance where the mechanical load is lower. For salt fog, specify coating, fastener material, bearing sealing, and MIL-STD-810H Method 509.7 exposure. For cleanroom equipment, review particle shedding, lubricant volatility, and surface treatment rather than choosing only by frame material.
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Q
How long do Perseus fans last in high-temperature duty?
AService life depends on bearing load, speed, temperature, humidity, vibration, and contamination. Representative Perseus DC fan models list L10 life of 50,000 hours at 40°C, while the Titan 400Hz AC reference model lists L10 life of 13,000 hours at 40°C. For semiconductor or furnace-adjacent duty, review lubricant temperature limit, bearing type, airflow path cleanliness, and the actual chamber-side ambient before using any catalog life value.
AA fan installed too close to a board, wall, filter, or bend can lose airflow and create tonal noise. As a first-pass rule, keep inlet and outlet clearance near 1 to 2 fan thicknesses when the enclosure allows it, avoid abrupt duct expansions or contractions, and use turning vanes where airflow must bend sharply. If space is constrained, verify the operating point with the P-Q curve and enclosure impedance rather than assuming the free-air CFM value will reach the heat source.
