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NAFIL-B Series Sub-High Efficiency Box-Type Air Filters: In-Depth Q&A on Application Scenarios

Created on 2025.10.20

NAFIL-B Series Sub-High Efficiency Box-Type Air FiltersIn-Depth Q&A on Application Scenarios

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In the air filtration industry, professionals often raise questions such as:
“What scenarios require sub-high efficiency filters? Why not just use high-efficiency or even ultra-high efficiency filters directly?”
“For variable air volume (VAV) systems and high-humidity environments, which type of filter is most suitable?
“In units with limited installation space, how can airflow efficiency and service life be balanced?”
The NAFIL-B Series Sub-High Efficiency Box-Type Air Filterprovides the answers.

Why do cleanrooms choose sub-high efficiency filters instead of directly using HEPA filters?

Air handling systems in cleanrooms typically adopt multi-stage filtration. Pre-filters capture larger particles, while medium/sub-high efficiency filters act as the critical “middle defense line,” significantly reducing particle concentrations before air enters the terminal HEPA or ULPA stage.
If the sub-high efficiency stage is skipped and all filtration is left to HEPA filters, the consequences are:
  • Resistance rises too quickly → system energy consumption increases
  • More frequent replacement of terminal filters → costs surge
  • Higher turbulence risks → compromising cleanroom stability
Therefore, NAFIL-B (E10, E11, E12 grades) is an irreplaceable part of the cleanroom filtration chain.
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What special requirements do high-humidity or VAV systems have for filters?

In high-humidity environments, traditional paper filters are prone to moisture deformation, which increases the risk of leakage.
NAFIL-B adopts nanofiber filter paper + separatorless hot-melt glue structure, offering excellent moisture resistance while ensuring structural strength even under humid or turbulent conditions.
In variable air volume (VAV) systems, where airflow fluctuates frequently, filters must provide:
  • Low initial resistance with slow resistance rise (only 90 Pa at E10)
  • Stable high dust-holding capacity (recommended final resistance 450 Pa)
  • Strength and durability (galvanized steel/aluminum frame ensures filter integrity)
  • Low energy consumption
  • Environmentally friendly incineration after use
This is why NAFIL-B is widely applied in modern commercial and industrial VAV HVAC systems.

How does NAFIL-B solve challenges in limited installation spaces?

Air handling units and machine rooms often face limited installation space.
NAFIL-B provides 220mm and 292mm thickness options, along with multiple dimensions such as 610x610mm, 610x305mm, to fit different system designs.
Meanwhile, its V-shaped low-pressure drop design maximizes filter media surface area within a limited depth, achieving the balance of:
  • High airflow
  • Low resistance
  • Long service life

Why not just use bag filters or panel-type medium filters?

Compared to bag or panel filters, NAFIL-B offers clear advantages:
  • Higher efficiency grades (E10–E12), capable of capturing finer particles
  • Higher dust-holding capacity and slower resistance rise → longer lifespan
  • Stable performance in turbulence and humidity, where bag filters are more vulnerable
  • l Lower energy consumption
  • Environmentally friendly disposal by incineration
Thus, for industrial and cleanroom applications with stringent air cleanliness requirements, NAFIL-B is the more reliable choice.

Conclusion

It seems that the source text you provided is incomplete. Please provide the full text you would like to have translated, and I will be happy to assist you with the translation.NAFIL-B Series Sub-High Efficiency Box-Type Air Filteris not a “replacement for HEPA filters,” but rather a critical layer in modern air handling systems.
Its value lies in:
  • Reducing the load on terminal HEPA filters in cleanrooms
  • Maintaining stable operation in high-humidity and VAV environments
  • Balancing airflow efficiency and lifespan in space-constrained units
  • Delivering low energy consumption performance
This is not just about selecting a filter—it’s about ensuring the long-term reliability of the entire air management system.

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