Month: July 2026

LONGWELL factory
By longwell / July 31, 2026 / Technical Articles

Fans for HVAC OEM: How to Build Long-Term Supply Partnerships?

In HVAC systems, fans are one of the most crucial components. Differen...

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Heat exchanger axial fans built as a pilot production run of fifty
By longwell / July 31, 2026 / Engineering Case Studies

Fifty Units First: What a Pilot Batch Is Actually For

The drawings were approved and the samples passed. The customer still ...

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AC axial fan qualified for vertical and horizontal fan mounting orientation
By longwell / July 30, 2026 / Engineering Case Studies

Shaft Up, Shaft Sideways: the Fan Has to Survive Both

Most specifications never mention which way the fan will point. This o...

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EC fan wiring interface with power, control and feedback leads
By longwell / July 30, 2026 / Engineering Case Studies

Eight Wires, and Every One of Them Specified

The airflow requirement took one line. The wiring specification took a...

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LONGWELL top 5 bathroom exhaust fan
By longwell / July 30, 2026 / Technical Articles

Top 5 Exhaust Fans for Bathrooms in 2026: Quiet & Energy Efficient

The bathroom is usually damp and hot, especially those without windows...

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Cross-flow vs axial comparison: a tangential fan cooling a wide surface
By longwell / July 30, 2026 / Engineering Case Studies

A Wide Surface Needs a Ribbon of Air, Not a Circle

Three fan geometries were candidates. Two failed for reasons that had ...

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A 120mm DC fan with impedance-type locked rotor protection
By longwell / July 30, 2026 / Engineering Case Studies

If the Blades Jam, the Fan Must Not Burn: 72 Hours of Proof

Every requirement in this order assumed the fan works. One requirement...

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what is bldc motor
By longwell / July 29, 2026 / Technical Articles

What is BLDC (Brushless DC) Motor?

Various types of motors are used in commercial or industrial fans, eac...

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Cross-flow fan motor built for clockwise fan rotation direction
By longwell / July 29, 2026 / Engineering Case Studies

You Cannot Just Run the Motor Backwards

The CAD integration found the motor on the wrong side of the chassis. ...

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A 900mm axial fan re-engineered for 50 Hz to 60 Hz grid conversion
By longwell / July 29, 2026 / Engineering Case Studies

Moving a 900mm Fan From 50 Hz to 60 Hz Is Not a Sticker Change

The customer wanted their proven 50 Hz fan for a 60 Hz market. The imp...

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