NAFIL-B Series Sub-High Efficiency Box-Type Air Filters: In-Depth Q&A on Application Scenarios
Created on 10.20
NAFIL-B Series Sub-High Efficiency Box-Type Air Filters: In-Depth Q&A on Application Scenarios
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?”
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:
- l Resistance rises too quickly → system energy consumption increases
- l More frequent replacement of terminal filters → costs surge
- l Higher turbulence risks → compromising cleanroom stability
Therefore, NAFIL-B (E10, E11, E12 grades) is an irreplaceable part of the cleanroom filtration chain.
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:
- l Low initial resistance with slow resistance rise (only 90 Pa at E10)
- l Stable high dust-holding capacity (recommended final resistance 450 Pa)
- l Strength and durability (galvanized steel/aluminum frame ensures filter integrity)
- l Low energy consumption
- l 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:
- l High airflow
- l Low resistance
- l 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:
- l Higher efficiency grades (E10–E12), capable of capturing finer particles
- l Higher dust-holding capacity and slower resistance rise → longer lifespan
- l Stable performance in turbulence and humidity, where bag filters are more vulnerable
- l Lower energy consumption
- l Environmentally friendly disposal by incineration
Thus, for industrial and cleanroom applications with stringent air cleanliness requirements, NAFIL-B is the more reliable choice.
Conclusion
The NAFIL-B Series Sub-High Efficiency Box-Type Air Filter is not a “replacement for HEPA filters,” but rather a critical layer in modern air handling systems.
Its value lies in:
- l Reducing the load on terminal HEPA filters in cleanrooms
- l Maintaining stable operation in high-humidity and VAV environments
- l Balancing airflow efficiency and lifespan in space-constrained units
- l 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.
+86 158 3197 8905
+86 158 3197 8905
sales1@nanofiltech.com
sales1@nanofiltech.com
HQ: Room 907, Tower A, No. 999 Jinzhong Road, Changning, Shanghai, China
Factory Ⅰ：No.7, No.4885 of Pingshan Rd., Pinghu, Jiaxing ,Zhejiang, China
Factory Ⅱ: A06, Tuolingtou Industrial Zone, Yangquan, Shanxi, China
HQ: Room 907, Tower A, No. 999 Jinzhong Road, Changning, Shanghai, China
Factory Ⅰ：No.7, No.4885 of Pingshan Rd., Pinghu, Jiaxing ,Zhejiang, China
Factory Ⅱ: A06, Tuolingtou Industrial Zone, Yangquan, Shanxi, China
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