Technical Blog -- Cooling Guides & Application Notes | Herays
Technical Blog

Technical Resources & Industry Insights

Explore technical guides, application notes, product selection tutorials, and industry news for industrial cooling solutions.

Large DC axial fan mounted in the wall of a greenhouse to exhaust hot air
DC Axial Fan

DC Axial Fan for Greenhouse Ventilation

Key Takeaways - Proper greenhouse ventilation isn't just about cooling; it's critical for managing humidity, preventing fungal diseases, and replenishing CO2 for healthy plant growth. - The standard starting point for calculating airflow is to aim for one full air exchange per minute. A common rule of thumb is 1-3 CFM for every square foot […]

Liang · · 10 min read
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Photo of a DC axial fan mounted in the roof vent of a camper van, with sunlight streaming in
DC Axial Fan

DC Axial Fan for RV & Camper Van Cooling

Key Takeaways RV ventilation isn't just about comfort; it's about managing moisture to prevent mold, exhausting cooking fumes, and ensuring appliances like refrigerators run efficiently. 12V DC is the standard for RVs because it runs directly off the house battery system, avoiding the inefficiency and complexity of using an inverter for AC fans. For roof […]

Liang · · 11 min read
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A rugged DC axial fan installed in an outdoor ventilation housing on a sunny day, with solar panels visible in the background
DC Axial Fan

DC Axial Fan for Solar-Powered Systems

Key Takeaways Solar power is not a stable voltage source; fans for these systems must handle wide voltage swings from dawn to dusk without stalling or burning out. A standard 12V DC fan can be damaged by the high open-circuit voltage (18V+) of a "12V" solar panel in full sun. "Wide input voltage" fans are […]

Liang · · 11 min read
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A rugged DC axial fan installed in an outdoor ventilation housing on a sunny day, with solar panels visible in the background
DC Axial Fan

DC Axial Fan for Marine & Outdoor Use: What to Look For

Key Takeaways A standard DC fan, even a high-quality one, will often fail within months in an outdoor or marine environment due to factors a datasheet doesn't cover, like corrosion and UV degradation. True marine-grade protection goes beyond a simple IP rating; it requires specific material choices and manufacturing processes like conformal coating and motor […]

Liang · · 11 min read
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Wiring diagram showing tachometer signal connection with pull-up resistor and microcontroller input, including voltage levels and pulse timing
DC Axial Fan

DC Fan Tachometer Signal: How to Monitor Fan Speed

Key Takeaways Tachometer (tach) signals provide real-time RPM feedback from DC fans, typically outputting 2 pulses per revolution for standard 4-wire fans. The tach signal is an open-collector output that requires a pull-up resistor to generate readable voltage levels for microcontroller inputs. Measuring the time interval between pulses gives more accurate instantaneous speed readings than […]

Liang · · 9 min read
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Environmental test chamber setup showing DC fans undergoing salt spray and humidity testing to validate conformal coating performance
DC Axial Fan

Conformal Coating for DC Axial Fans: Harsh Environment Protection

Key Takeaways Conformal coating is a thin protective film applied to electronic components, including DC fan motors and control circuits, to shield against moisture, salt spray, dust, and chemical exposure. Coating becomes essential when fans operate in harsh environments like marine, automotive, industrial, or outdoor applications where standard fans would fail prematurely. Acrylic, silicone, and […]

Liang · · 9 min read
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Industrial electrical cabinet with multiple DC axial fans mounted on ventilation panels, showing professional installation in a factory environment
DC Axial Fan

DC Axial Fan for Cabinet Cooling: Selection & Layout Guide

Key Takeaways Cabinet cooling failures typically stem from poor airflow design rather than undersized fans — even high-CFM fans fail if hot air recirculates instead of exhausting properly. Heat load calculation should account for both continuous power dissipation and peak transient loads, since electrical components often surge well above their steady-state ratings. Intake fans need […]

Liang · · 11 min read
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Professional installation of a DC axial fan with anti-vibration mounts in an industrial control panel, showing proper cable management
DC Axial Fan

How to Mount a DC Axial Fan Properly: Anti-Vibration Tips

Key Takeaways Improper mounting is the leading cause of premature bearing failure and excessive noise in DC axial fans, often more damaging than running beyond rated specifications. Over-tightening mounting screws can distort the fan frame and misalign the rotor, while under-tightening allows vibration transmission that amplifies noise through the enclosure. Anti-vibration pads and gaskets reduce […]

Liang · · 10 min read
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Side-by-side comparison of a DC axial fan and a centrifugal blower fan showing their different housing shapes and blade orientations
DC Axial Fan

DC Axial Fan vs Centrifugal Fan: Key Differences

Key Takeaways Axial fans pull air straight through along the motor shaft axis, while centrifugal fans draw air in axially then redirect it 90 degrees outward through radial discharge. Centrifugal fans generate significantly higher static pressure (typically 2-10x more) than axial fans of comparable size, making them better for pushing through filters, ducts, and restricted […]

Liang · · 9 min read
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