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

A greenhouse is built to trap heat and humidity -- which is great for the plants and terrible for anything electronic inside it, fans included. Key Takeaways Greenhouse ventilation isn't only about cooling. It's what manages humidity, keeps fungal disease down, and replenishes the CO2 plants need to grow. A good starting point for airflow […]

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

RVs throw everything at a fan at once -- vibration from the road, wide temperature swings, dust, moisture, and a battery you can't afford to drain -- which is why a fan that works fine in a house doesn't always survive on the road. Key Takeaways RV ventilation isn't just about comfort. It's what keeps […]

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

Connect a standard 12V computer fan straight to a solar panel and it'll either refuse to start in low light or cook itself at midday -- solar power just isn't the stable voltage source most fans are designed for. Key Takeaways Solar isn't a stable voltage source. A fan built for these systems has to […]

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

A fan that runs flawlessly in the lab can be dead within a season once it's on a boat or bolted to outdoor equipment -- indoors and outdoors are really two different products. Key Takeaways Even a well-made standard DC fan will often fail within months outdoors or at sea, from things a datasheet never […]

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

Cooling failures are usually silent failures -- the fan stops moving air and nothing tells you until the overheating damage is already done. The tach signal is the one thing that can catch it early. Key Takeaways Tach signals give real-time RPM feedback, typically two pulses per revolution on a standard 4-wire fan. It's an […]

Liang · · 10 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

Take a fan that works fine indoors and drop it into a salt-spray marine environment or an outdoor cabinet, and the unprotected electronics become the weak link fast -- that's usually where conformal coating enters the conversation. Key Takeaways Conformal coating is a thin protective film over the motor and control circuit that shields against […]

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

Cabinet cooling gets treated as an afterthought until something overheats and takes down a production line -- and by then the fix usually isn't a bigger fan, it's a better airflow layout. Key Takeaways Most cabinet cooling failures trace back to poor airflow design, not undersized fans. Even a high-CFM fan fails if hot air […]

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

More fans fail from bad mounting than from electrical problems or bearing defects combined -- a perfectly good fan can turn into a noise generator, or die early, just from how it's bolted in. Key Takeaways Improper mounting is the leading cause of premature bearing failure and excess noise in DC axial fans -- often […]

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

Engineers get stuck comparing CFM ratings and miss the bigger question: does the air in your system move in a straight line, or does it need to turn a corner? That's really what decides between axial and centrifugal. Key Takeaways Axial fans push air straight through along the motor shaft. Centrifugal fans pull air in […]

Liang · · 9 min read
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