Primary Medium and HEPA Air Filter for Cleanroom HVAC System
Introduction:Multi-stage air filtration is the core of cleanroom purification, which realizes graded purification of airflow through primary, medium and high-efficiency filters. This series of air filters covers G1-U17 efficiency grades, widely used in pharmaceutical, electronics, food and hospital clean air conditioning systems. It can be matched with Dust Collector Filter and Air compressor filter to build a complete multi-stage air purification system for industrial air intake and indoor air purification.
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Product Introduction
Our primary, medium and HEPA air filters are designed for staged air purification of HVAC, cleanroom and air compressor intake systems. Matched with Dust Collector Filter, Air compressor filter and other supporting filter elements, they form a complete air purification chain, which can remove dust, particles, bacteria and suspended solids step by step. The product portfolio includes primary filter, medium filter, HEPA filter and W-type high-capacity sub-HEPA filter, covering EN779 and MPPS efficiency grades from G1 to U17. Different styles, frame materials and filter media are optional to adapt to ordinary air conditioning, high cleanliness clean workshop, high air volume and high humidity working conditions. They are widely used as pre-filter for air compressors, air conditioning intermediate filtration and terminal filtration of clean rooms.
Working Principle
The whole purification process adopts serial staged filtration: Airflow passes through the primary filter for preliminary purification, then enters the medium filter for secondary purification, and finally is filtered by HEPA filter before being sent into the clean room. The air returns through the louver and circulates back to the primary filter for repeated purification.
Primary filter: intercept large particles, hair, fiber and coarse dust;
Medium filter: capture 1~5μm fine dust, reduce the dust load of the terminal HEPA;
HEPA filter: trap particles below 0.5μm, bacteria and suspended contaminants, achieving high cleanliness requirements. The filter efficiency comparison table follows international standards including EN779, Eurovent, ASHRAE and Chinese classification, supporting clear model selection for different cleanliness levels from 100, 1000, 10000 to 100000 grade cleanrooms.
Filter Series & Specifications
1. Primary Air Filter
Styles: Panel, folded, pocket, box type Frame material: Paper frame, aluminum frame, galvanized iron frame, stainless steel frame Filter media: Non-woven fabric, nylon mesh, activated carbon filter cotton, metal mesh Grades: G1, G2, G3, G4 (EN779), thickness 21mm / 25mm Features: Low cost, lightweight, compact structure, reusable after cleaning, large dust holding capacity. Application: Central air conditioning, centralized ventilation system, large air compressor inlet filtration, return air system pre-filter, front protection for high-efficiency filters.
2. Medium Air Filter
Styles: Pocket type, box type, combined type Efficiency: F5-F9 (colorimetric method) Filter media: Superfine synthetic fiber / glass fiber with static fiber Features: Low resistance, large air flow, high dust holding capacity, good air permeability, long service life, excellent capture performance for particles above 1μm. Application: Pharmaceutical, electronics, food industry and general air conditioning intermediate filtration, suitable for environments with high dust concentration.
3. HEPA Air Filter
Filter media: Superfine glass fiber filter paper, separated by separator paper or aluminum foil Sealing material: Polyurethane sealant Efficiency: H13, H14, MPPS efficiency 99.95%, 99.995% Working temperature: ≤70℃, instant temperature up to 99℃ Types: Separated HEPA, non-separated HEPA, high airflow HEPA, ULPA Features: High filtration efficiency, low resistance, large dust holding capacity, lightweight. Application: Optical electronics, LCD manufacturing, biomedicine, precision instruments, PCB printing, food clean workshop terminal air supply, FFU and purification equipment.
4. W-type High Capacity Sub-HEPA Filter
Frame: ABS plastic / galvanized steel plate Filter media: Superfine polypropylene filter paper or glass fiber filter paper Working condition: Temperature ≤80℃, humidity up to 100% Features: High air volume, high dust holding capacity, low initial resistance, small installation space, suitable for variable air volume, high humidity and corrosive air systems. Application: Office, hospital, shopping mall, airport, large civil HVAC, pre-filtration for clean workshop ventilation system.
Key Cleanroom Reference Parameters
Air change rate: Class 100000: 12–20 times/h; Class 10000: 20–30 times/h; Class 1000: 45–60 times/h
Pressure difference: ≥5 Pa between main workshop and adjacent room
Average wind speed: Class 10 / 100: 0.3–0.5 m/s
Temperature: Winter＞16℃, Summer＜26℃, fluctuation ±2℃
Noise: ≤65dB(A)
Fresh air supply: 10%–30% of total air volume
Illuminance: 300LX
Humidity: 45%–65%; About 50% for GMP powder workshop; higher humidity for electronic workshop to avoid static electricity
Core Advantages
Complete efficiency grades covering coarse, medium, high and ultra-high efficiency, one-stop supporting for staged filtration.
Diversified frames and filter media, optional for normal temperature, high humidity, corrosive and explosion-proof conditions.
Low initial resistance, stable airflow, large dust holding capacity to extend service cycle.
Strictly produced in accordance with international classification standards, compatible with global HVAC and cleanroom projects.
Can be combined with Dust Collector Filter and Air compressor filter to realize multi-scene air purification for both indoor and air compressor intake.
Application Scope
Pharmaceutical GMP clean workshops, hospital operating rooms and laboratory purification
Electronic semiconductor, LCD, PCB, precision instrument manufacturing cleanroom
Food and beverage processing, packaging and filling purification air conditioning
Central air conditioning for office buildings, airports, shopping malls and stadiums
Air compressor station inlet pre-filtration, industrial ventilation and dust removal supporting filtration
Installation & Maintenance
Follow the sequence of primary → medium → HEPA for staged installation, avoid reverse installation to prevent early clogging of high-efficiency filters.
Regularly check the pressure difference; replace the filter element in time once the pressure drop exceeds the rated value.
Protect the filter paper of HEPA filter from puncture and damage during installation.
Cooperate with Dust Collector Filter and Air compressor filter for upstream protection to reduce the dust load of the terminal purification system.
Cleanable primary filter can be washed repeatedly to reduce operating cost.
FAQs
Q1: What is the difference between H13 HEPA and F9 medium filter?
A: F9 medium filter mainly captures 1~5μm particles, used for intermediate filtration. H13 HEPA can capture 0.5μm particles with efficiency above 99.95%, which is used for terminal high-cleanliness filtration.
Q2: Which filter is suitable for air compressor inlet?
A: G4 primary filter or F5-F7 medium filter is generally used as pre-filter, matched with Air compressor filter to protect the compressor.
Q3: Can W-type high capacity filter work in high humidity environment?
A: Yes, the W-type filter can adapt to 100% humidity, suitable for humid air conditioning and ventilation systems.
Q4: Is the primary filter reusable?
A: Primary filters with synthetic fiber media can be cleaned several times; medium and HEPA filters are disposable and cannot be washed.
Q5: How to match filters for a 100000 grade clean room?
A: G4 primary + F8/F9 medium + H13 HEPA is the common standard configuration.
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