How to determine if the DC fan FFU is working properly?

Author:Jason Peng
Cleanroom Engineering Technology Manager of Deiiang Company.

Product R&D Manager of GDC Inc. Cleanroom Equipment Manufacturing Company.

Executive Director of Guangdong Cleanroom Industry Association of China.

Engaged in R&D of related products for 15 years, with rich relevant technical experience
2025-02-12 | Visits:

A DC Fan Filter Unit (FFU) combines a fan motor and a high-efficiency filter (hepa/ULPA) to provide Clean airflow in controlled environments. Proper operation ensures consistent airflow, filtration efficiency, and system longevity.

How to determine if the DC fan FFU is working properly.jpg

DC Fan FFU Airflow Measurement

Measure airflow velocity at the filter’s surface. Compare results with the manufacturer’s specifications (typically 0.3–0.5 m/s for HEPA).

Perform a smoke test or use a ribbon to ensure airflow is evenly distributed across the filter surface. Uneven flow may indicate fan or filter issues.

HEPA or ULPA Filter Inspection

Look for physical damage, discoloration, or particle buildup on the filter surface.

Performance tests:

differential pressure Test: Measure pressure drop across the filter (normal range: 200–500 Pa). A spike indicates clogging.
Seal integrity: Use a particle counter to test for leaks around the filter frame.
Replacement history: Track filter lifespan (typically 1–5 years, depending on usage).

Monitor airflow resistance: Sudden changes in fan speed or noise may signal filter blockage.

DC Fan FFU Cleaning and Maintenance

Clean exterior surfaces: Wipe the unit’s housing and fan blades with a lint-free cloth and isopropyl alcohol.

Inspect fan components: Check for dust accumulation on motor blades and ensure electrical connections are secure.

Replace filters promptly: Follow manufacturer guidelines or replace when pressure drop exceeds recommended limits.

DC Fan FFU Buying Guide

Prioritize performance:

Match airflow capacity (CFM/m³/h) to room size.
Verify filter efficiency (e.g., HEPA H13, ULPA U15).

Evaluate reliability:

Choose brands with ISO certification.
Confirm warranty coverage and after-sales support.

Summary

To ensure a DC Fan FFU works properly:

Regularly measure airflow and inspect filters.
Clean components and replace filters based on performance data.
Select units with certified performance and robust support.
Proactive maintenance and adherence to specifications are key to optimal operation in cleanrooms or labs.

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