How to Choose an FFU ? DC or AC? No hesitation after reading

April 10, 2026

In cleanroom construction, Fan Filter Unit (FFU), as a core terminal device, directly determines the system's energy consumption and operational efficiency. Facing the two technical routes of DC (EC) and AC, KLC outlines the key differences to help you make an informed decision.

KLC Comparison of DC and AC FFU

▍Energy Consumption: KLC DC Fan Filter Unit (FFU) use high-efficiency EC motors, improving efficiency by 30%-50% compared to traditional AC motors. In large-scale cleanrooms, the KLC DC solution can significantly reduce annual electricity costs.

▍Control: KLC AC Fan Filter Unit (FFU) typically use stepped speed control with limited precision, while KLC DC Fan Filter Unit (FFU) support 0-100% stepless speed control. Paired with the group control system, the fan status can be monitored in real time, automatically compensating for speed reduction caused by filter resistance increase, ensuring constant cleanliness.

▍Noise: KLC DC Fan Filter Unit (FFU) operate smoothly with low vibration, producing 3-5 decibels less noise than AC models, better meeting the silent requirements of biopharmaceutical or precision electronics workshops.

▍Cost: KLC AC Fan Filter Unit (FFU) have a simple structure with lower initial purchase costs; although KLC DC Fan Filter Unit (FFU) require higher upfront investment, their long-term operational benefits are significant.

▲ KLC Fan Filter Unit (FFU)

Specification and Size Selection

KLC’s mainstream FFU sizes include 1175×575mm and 575×575mm. Selection must strictly match the ceiling grid module. The casing materials are available in galvanized steel, stainless steel, or aluminum alloy to meet different environmental corrosion resistance requirements.

▲ KLC Fan Filter Unit (FFU)

Selection Recommendations

For small cleanrooms or temporary sites with limited budgets, KLC AC Fan Filter Unit (FFU) offer better cost-effectiveness; for large-scale, high-grade cleanrooms, KLC DC Fan Filter Unit (FFU) are the first choice, with lower long-term operational costs.

As an air purification expert with 20 years of history, all KLC Fan Filter Unit (FFU) products undergo 100% factory testing to ensure every unit operates stably at low energy consumption.