Quality Control

Fan quality control on the line: balance grade, airflow and sound spot checks, hipot and insulation testing, and what a QC report should show you.

longwell-wi-6985126398-project
By longwell / May 8, 2026 / Engineering Case Studies

HVAC Motor Vibration Isolator Replacement Project

See how Longwell reverse-engineered a 1,000-piece replacement motor vi...

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longwell-lwaa2d250s-5meb-31-pr
By longwell / April 23, 2026 / Engineering Case Studies

250mm Hydraulic Radiator Cooling Fan | 415V

Read how we specified a 250mm hydraulic radiator cooling fan to meet 4...

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longwell-wi-6961899402-project
By longwell / April 15, 2026 / Engineering Case Studies

Outdoor HVAC Fan Motor Mounting Screws: M4x10 Lock Design

Learn how we solved severe vibration issues with custom M4x10 fan moto...

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longwell-wi-6957173679-project
By longwell / April 14, 2026 / Engineering Case Studies

150mm Wide Voltage DC Fan for Window Ventilation

A customer needed a wide voltage dc fan for home windows. Read how we ...

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longwell-wi-6956337739-project
By longwell / April 13, 2026 / Engineering Case Studies

High-Volume HVAC Part Isolation and Torque Specifications

Learn how we engineered a custom rubber fan motor hub to handle 1000 N...

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longwell-lwad8025lx-29-project
By longwell / April 13, 2026 / Engineering Case Studies

Upgrading a 12V Hardware System for Higher Airflow (42 CFM)

See how we engineered a replacement 8025 DC cooling fan to deliver 42....

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longwell-lwad20060-project-ima
By longwell / April 11, 2026 / Engineering Case Studies

200mm 48V DC Fan Moving 1100 CFM

See how we engineered a 200mm 48v dc fan to move 1100 CFM at 5800 RPM....

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longwell-lwea150-spec-sheet-02
By longwell / April 10, 2026 / Engineering Case Studies

Adapting a Circular Window Ventilator to 2000 RPM on 60Hz

Learn how we built a 5000-unit batch of 220V 60Hz circular window vent...

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longwell-lwif-750-project-imag
By longwell / March 30, 2026 / Engineering Case Studies

220V 30 Inch Pedestal Mist Fan Design Constraints and Output

Review the engineering parameters for a 350W 30 inch pedestal mist fan...

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longwell-lwad6025mm-11-project
By longwell / March 28, 2026 / Engineering Case Studies

60mm DC Cooling Fan for a 60 x 25mm Enclosure Opening

Review the exact engineering trade-offs behind a 24V 60mm dc cooling f...

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