In industrial environments, sources of dust, oil mist, smoke, and gaseous pollutants vary. When selecting HVAC air filters, it is necessary to consider actual requirements comprehensively:
⊙ Filtration Efficiency: Determined by particle size and filter rating.
Example: General dust → medium efficiency.
Cleanroom / pharmaceutical → high efficiency (HEPA or above).
⊙ Pressure Drop: The finer the filter media, the greater the initial resistance. Selection should balance fan motor energy consumption with filtration performance.
⊙ Operating Environment:
High temperature → metal frame / heat-resistant materials.
High humidity → moisture-resistant design.
Oil mist / welding fumes → activated carbon filter or specialized treatment.
⊙ Service Life & Replacement Cycle:
Pre-filters (coarse) → typically replaced every 3~6 months.
Medium efficiency filters → 6~8 months.
HEPA/ULPA → around 12 months.
All above depending on site conditions.
⊙ Cost & Maintainability:
Using a pre-filter + main filter combination extends service life.
Washable filter media (e.g., metal mesh) reduces replacement frequency.
| Type | Features | Application |
| Pre-filters | particle ≥5 μm, low initial pressure drop | pre-filtration, larger particles |
| Secondary filters | particle ≥1 μm | general manufacturing, hospital HVAC |
| HEPA filters | 0.3 μm ≥ 99.97% | clean room, semi-conductor, medicals |
| Chemical filters | active carbon, odor absorption | chemical factory, laboratory, paint factory |
| Washable filters | nylon or metal filter | acid/alkali resistant, food processing plant |
| High temp. resistant filters | high temp. resistance, fireproof certificate | high temp. process, fire proof requirements |
🔹Most industrial HVAC systems adopt a multi-stage filter design, in which air is filtered layer by layer to extend service life:
Coarse → Medium → High / Ultra-high efficiency (Example: Pre-filter → Bag filter → HEPA)
🔹Principles for Selecting Industrial Air Filters
| 1. Application Environment | General factories / offices: Coarse + medium efficiency filters. Medical, food, electronics assembly: Coarse + medium + HEPA filters. Semiconductor, pharmaceutical, precision manufacturing: Coarse + medium + high efficiency HEPA/ULPA filters. Chemical, paint shops, laboratories: Activated carbon filter + multi-stage filtration. High-temperature or high-humidity processes: Metal mesh or high-temperature resistant filters. |
| 2. Particle Size and Efficiency | Coarse filter : Removes >5 μm particles, protects downstream filters. Medium filter : Removes 1–5 μm particles, blocks fine dust. High efficiency HEPA : Removes 0.3 μm particles, captures bacteria and fine particles. Ultra-high efficiency ULPA : Removes 0.12 μm particles, for ultra-clean environments. |
| 3. Pressure Drop and Energy Consumption | High efficiency filters create higher resistance → require upstream coarse/medium filters to extend service life and reduce fan energy consumption. |
| 4. Maintenance Cost | Multi-stage design (coarse → medium → high efficiency) reduces replacement frequency. Washable metal mesh is suitable for coarse dust environments. Special purpose filters for high temp. resistance, fireproof. Regular monitoring of pressure drop prevents insufficient airflow or filter damage. |
* More pleats → Increased pleats to enlarge filtration area, resulting in a longer service life compared to competitors.
* Optimized pleat spacing → Smooth airflow without blockage, further enhancing fan motor energy efficiency.
* Metal support mesh → Prevents pleat collapse or deformation, ensuring optimal filtration performance.
🔹 The selection of industrial air filters should balance application requirements, particle size control, energy consumption, and maintenance costs. A multi-stage filtration design — progressing from coarse to fine — ensures air quality, prolongs filter lifespan, and lowers operating costs.
We understand customers’ cost considerations, so we will strive to find the optimal balance between cost and performance to meet customers' diverse applications and requirements.
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