Purification fan boxes combine low-noise centrifugal air movement with factory-integrated multi-stage filtration — primary coarse, secondary medium, terminal HEPA, and activated carbon odor adsorption — inside one sealed acoustic cabinet.
Compare YONGFAN DFX Purification configurations for electronics cleanrooms, pharmaceutical workshops, commercial kitchens, food processing, and healthcare clinics with verified filter module resistance (+150 to +350 Pa working ΔP), differential pressure monitoring, and quick-release access doors.
A standard ventilation fan box operates across clean ductwork. In a purification fan box, the air must pass through coarse mesh, primary pleated panels, medium synthetic bags, and dense HEPA pleat packs.
Filters accumulate particulate matter over time. Sizing must account for dirty / working resistance — not just clean initial resistance — to ensure target airflow is delivered throughout the complete filter lifecycle.
Adding filter module working delta P (typically +150 to +350 Pa) to external duct static loss ensures the base centrifugal fan has adequate static head and motor horsepower.
Sizing must account for loaded working pressure drop (e.g. F8 @ 170 Pa, HEPA @ 300 Pa) to prevent airflow decay between filter changes.
Coarse pre-filters protect expensive medium and HEPA stages, extending HEPA life from months to several years.
Factory-mounted Magnehelic ΔP gauges on each stage provide visual indication for timely filter maintenance.
Multi-stage train removing coarse ambient dust (G4), fine atmospheric particulates (F8 90% @ 1 µm), and sub-micron particles with terminal H13 (99.95%) filtration.
Combines particulate removal with high-capacity activated carbon deep beds for VOC / odor vapor adsorption, followed by terminal medical-grade H14 (99.99%) filters.
Washable nylon mesh traps grease droplets; G4 panels capture airborne soot; activated carbon panels achieve >90% kitchen cooking odor removal.
Medical-grade air treatment for clinic consultation rooms, isolation suites, and dental laboratories, trapping bacteria and airborne respiratory droplets.
| Filter Module Stage | Supplier Grade & Media Type | Target Filtration Performance | Air Resistance (ΔP Clean / Working) | Action |
|---|---|---|---|---|
| Primary Coarse Stage | Washable Nylon Mesh Screen | Insects, fibers, and coarse dust particles > 50 µm | 20 Pa Clean Resistance |
Washable |
| Primary Pleated Panel | G1 – G4 Synthetic Pleated Panel | 40% – 90% arrestance of dust > 5 µm | 30 – 50 Pa Clean · 70 Pa Working |
Disposable |
| Medium Pocket Bag | F5 – F8 Synthetic Meltblown Pocket | 45% – 90% filtration efficiency @ 1.0 µm | 70 – 150 Pa Clean · 170 Pa Working |
High Capacity |
| High-Efficiency HEPA | H11 – H14 Glass Microfiber Mini-Pleat | 95% – 99.99% cleanroom efficiency @ MPPS (0.3 µm) | 180 – 220 Pa Clean · 300 Pa Working |
Cleanroom Grade |
| Odor Adsorption | Activated Carbon Panel / Bag Bed | > 90% odor, VOC, and solvent vapor removal | 25 – 40 Pa Working Resistance |
Refillable/Replace |
| Auxiliary Heating | PTC Ceramic / Heat-Pipe Module | Electric winter air tempering and humidity reduction | Negligible Resistance (≤ 10 Pa) |
Optional Winter |
Filter efficiency is compromised if air bypasses around holding frame edges. DFX Purification cabinets utilize precision knife-edge or extruded gasket clamping tracks that ensure 100% positive sealing for HEPA and carbon modules.
Standard filter module sizes (e.g. 592 × 592 mm / 24″ × 24″) ensure universal replacement availability worldwide.
Purification cabinets require frequent filter inspection and replacement. DFX units feature insulated hinged access doors with cam-lock handles on the service side.
Maintain at least one cabinet width of clear space on the access side to allow maintenance technicians to withdraw full-size 600 mm pocket filters and heavy carbon trays.
Submitting target particle sizes, VOC concentrations, airflow, and duct static pressure allows our team to calculate total system resistance and select the optimal base fan motor.
Filter holding channels feature compression latching systems that guarantee 100% gasket compression, preventing bypass of unfiltered air around media edges.
Double-skin insulated panels and closed-cell EPDM gaskets achieve EN 1886 Class L1 airtightness under ±1000 Pa operating static pressure.
Every HEPA stage is verified for initial pressure drop and particulate filtration efficiency using calibrated optical particle counters prior to shipment.
Supplied complete with filter test certificates, motor electrical test logs, and dimensioned 3D CAD/BIM submittal models.
DFX Purification units support washable nylon mesh (20 Pa), primary G1–G4 (70 Pa working), secondary F5–F8 (170 Pa working), HEPA H11–H14 (300 Pa working), activated carbon odor filters, and auxiliary PTC heating.
Add 250 to 300 Pa working resistance to external duct static loss. Sizing the base fan without filter working delta P causes severe airflow reduction.
Yes. Multi-stage DFX Purification cabinets accommodate 2-stage, 3-stage, or 4-stage filter trains in series with dedicated service doors for each stage.
We recommend a G4 pre-filter + F8 secondary pocket filter + H13 terminal HEPA filter configuration, capturing 99.95% of airborne particles ≥ 0.3 µm.
We recommend washable nylon mesh + G4 pleated panels + activated carbon adsorption modules to remove grease soot and >90% cooking odors.
DFX units can be equipped with differential pressure Magnehelic gauges or pressure switches that trigger BMS alerts when working ΔP thresholds are reached.
Yes. All DFX filter modules use standard international dimensions (e.g. 592 × 592 mm / 24″ × 24″), ensuring low-cost replacement media availability.
DFX Purification provides dedicated air movement and filtration for specific zones or clean rooms. For central chilled-water thermal cooling and full humidity control, a central AHU is used.
Send your required clean airflow, target contaminants, room cleanliness class, and duct drawings — our application engineers will configure the optimal multi-stage filter train and supply certified technical submittals.
