Gas-phase filtration should be selected from the contaminant, airflow direction and protection objective—not from a generic “activated carbon filter” label.
Compare YONGFAN PSA fresh-air chemical filtration units (850–34,000 m³/h), PSA-PG high-airflow units (1,700–68,000 m³/h), DBS corridor positive-pressure/recirculation units, CA indoor recirculation units (850–6,800 m³/h with MediaPAK PK-12 modules), WGP industrial exhaust gas treatment (to 100,000+ m³/h), and OGP wastewater odor capture enclosures.
Assuming HEPA filters capture molecular gases; toxic H2S, SO2, and VOCs pass right through particle filters and corrode copper/silver circuit tracks.
Installing a protected-room fresh-air PSA unit on a heavy industrial exhaust stack, or using an open exhaust scrubber for pressurized room intake.
Using standard virgin carbon for acid gases (NOx, SO2, chlorine) where specialized chemical chemisorption (permanganate CPB) is required.
Increasing exhaust treatment unit airflow on wastewater tanks without installing OGP source-capture covers allows odor to escape into atmosphere.
Standard fresh-air corrosion-control platform for electrical control rooms (850–34,000 m³/h, 99.5% removal efficiency for target gases, ISA S71.04 Class G1 target, 2,000 Pa casing rating, <1% leakage at 1,000 Pa). Filtration train: G4 pre-filter + two-stage gas-phase (PK12-PCB KOH & PK12-CPB KMnO4) + F8 final particulate filter.
High-capacity corrosion-protection platform delivering twice the airflow of standard PSA units (1,700–68,000 m³/h, 0.75–37 kW, 380 V 50 Hz, 2,000 Pa casing rating, <1% leakage at 1,000 Pa). Consolidates large fresh-air demand into fewer high-capacity skids to reduce duct branches and maintenance points.
Configured for indoor or corridor installation. Operates in positive-pressure fresh air mode or indoor recirculation cleaning mode. Features G4 upstream + chemical media + F8 downstream filtration with a top-fill / bottom-discharge loose media design for rapid on-site media replacement.
Self-contained room air purifier (850–6,800 m³/h across 500V, 1000V, 2000V, 4000V models) with built-in VFD, LCD control, and sound-treated fan (<65 dB). Utilizes rail-mounted MediaPAK PK-12 slide-in modules for clean, fast replacement without handling loose media.
Heavy-duty industrial exhaust treatment for complex contaminated gas streams (several thousand to 100,000+ m³/h custom). Features G4 particulate pre-filtration, deep coal-based activated carbon (iodine ≥1,000 mg/g, hardness ≥95%, CTC ≥60%), and multi-stage chemical chemisorption beds with combustible/toxic gas detection interlocks.
Modular source collection and capping system for wastewater treatment tanks, clarifiers, and sludge channels. Fabricated from FRP, stainless steel, or polycarbonate; captures fugitive odor and routes it directly to WGP treatment equipment (1,000–10,000 m³/h models, 150 Pa ESP).
| System Objective | Product Route | Documented Capacity / Boundary | First Data to Confirm |
|---|---|---|---|
| Treat fresh air for a protected control room | PSA | 850–34,000 m³/h · ISA G1 target | Fresh-air volume & full gas analysis |
| Treat high-volume fresh air for large halls | PSA-PG | 1,700–68,000 m³/h per unit | Total fresh-air demand & unit redundancy |
| Indoor/corridor positive pressure or recirc | DBS | Function documented; project sized | Room mode, gas load & installation space |
| Standalone indoor room recirculation | CA | 850–6,800 m³/h · MediaPAK | Room volume, air-change target & gas mix |
| Treat outgoing industrial / process exhaust | WGP | Several thousand to 100,000+ m³/h custom | Exhaust airflow + full gas composition |
| Capture wastewater tank fugitive odor | OGP + WGP | OGP 1,000–10,000 m³/h models | Tank geometry, capture airflow & gas load |
List gas names (H2S, SO2, Cl2, NOx, VOCs, mercaptans), normal/peak concentrations (ppm or mg/m³).
Define Fresh Air Intake (PSA/PSA-PG), Room Recirculation (CA/DBS), or Outgoing Exhaust (WGP).
Select KOH-impregnated (PCB), permanganate-impregnated (CPB), or high-CTC coal-based carbon.
Specify toxic gas detector interlocks, airtight motorized shutoff dampers, and copper/silver coupons.
YONGFAN chemical filtration engineers will calculate media bed depths, verify gas contact times, check casing leakage ratings, and size fan static pressures.
PSA, PSA-PG, and DBS housings are certified to 2,000 Pa casing strength with <1% leakage at 1,000 Pa differential pressure.
Chemical media batches are tested per ISO 10121-1/-2 for single-pass gas removal efficiency and capacity.
Chemical media and activated carbon hold UL/SGS fire safety certification and complete chemical Safety Data Sheets.
WGP scrubbers undergo third-party whole-unit testing for airflow, total pressure, and purification efficiency.
No. HEPA filters only remove suspended solid/liquid particles. Molecular gases require gas-phase chemical media tailored to the specific gas chemistry.
PSA treats incoming outdoor air to protect indoor electronics from corrosion. WGP treats contaminated outgoing process or wastewater exhaust before atmospheric discharge.
Choose PSA-PG when fresh-air demand is very high (1,700–68,000 m³/h per unit). It consolidates airflow into fewer high-capacity units to simplify ductwork and maintenance.
DBS is designed for corridor/plant rooms and can provide positive-pressure fresh air or recirculation with loose media. CA is a dedicated quiet indoor recirculation purifier with slide-in MediaPAK modules.
No. CA continuously cleans recirculated room air, but it does not supply the outdoor air required for room ventilation or positive pressurization.
WGP targets H2S (≥99%), SO2 (≥99%), TVOCs (≥95%), formaldehyde (≥96%), chlorine, ammonia, NOx, mercaptans, and mercury vapor.
From exhaust airflow, gas species, and peak concentrations. The depth and stage count of the activated carbon and chemical chemisorption beds are customized for that load.
OGP is an odor-source capping/enclosure system for wastewater tanks and channels. It captures fugitive emissions and routes them to WGP for treatment.
There is no universal calendar date. Typical documented references are 1–2 years, but actual replacement depends on gas concentration, airflow, humidity, and operating hours.
No. The unit delivers G1-grade air, but room environmental quality also depends on room leakage, positive pressurization, door opening frequency, and internal sources.
Never use protected-room fresh-air units (PSA/PSA-PG) for outgoing process emissions, and do not use exhaust scrubbers for pressurized room intake.
ISA S71.04 Class G1 is a complete room target; one cabinet does not independently guarantee G1 without positive pressure and sealed penetrations.
Supplier-published 99.5% gas removal values apply to documented test conditions and media configurations; verify against site gas concentrations.
OGP is a mechanical enclosure for collecting odor; WGP performs the actual gas removal and emission treatment duty.
Send your gas analysis, concentration data, airflow rates, and application objective. YONGFAN chemical filtration engineers will select media blends, calculate contact times, size fan static pressures, and provide certified submittals.
