HVAC components should not be selected as isolated catalog items. The fan, filter, damper, heat exchanger, valve, water-treatment device and control point all have to work inside one operating system.
YONGFAN’s Systems & Solutions pages are organized around engineering interfaces across 8 core routes: Airside Ventilation, Cleanroom Filtration, Fire & Smoke Exhaust, Industrial Gas-Phase, Control Room Corrosion, Tunnel Ventilation, Hydronic Plant Rooms, and Heat Exchange & Water Treatment.
A fan meets its catalog airflow but starves index zones because coils, filters, silencers, and dampers add more pressure drop than estimated.
A HEPA filter passes factory scans but the room misses cleanliness specs due to inadequate pre-filtration, bad casing seals, or room pressure loss.
A normal 70 °C fire damper is mistakenly placed in a smoke exhaust path, shutting down emergency extract while the 280 °C smoke fan is running.
A booster pump skid is installed where closed-loop expansion control is needed, causing cyclic pressure loss and relief valve discharge.
Coordinates axial (DTF/DTXF), mixed-flow (SWF 1,430–144,260 m³/h, 1,314 Pa), centrifugal (4-72), roof fans (DWT), DFS duct fans, JG/T 436 dampers, pressure-independent YFVAV-S-T100 terminals, YF-MOA plenums, and acoustic silencers into one balanced pressure chain.
Staged particle removal from coarse pre-filters (CG/CY) and medium filters (ZF bags, ZZH V-banks) to scan-tested terminal HEPA/ULPA filters, GFK passive supply boxes (500–3,000 m³/h), GCFK 150mm ultra-thin diffusers, and distributed FFU fan filter units (900 m³/h, ≤54 dB(A)).
Coordinated emergency smoke extraction and fire compartment isolation. Features HTFC centrifugal fan boxes (280 °C / 30 min dual-speed), DTF in-line axial smoke fans, FHF 70 °C fire dampers, PFHF 280 °C smoke-exhaust fire dampers, and PYF normally closed DC24V smoke valves.
Targeted removal of gaseous molecules (H2S, SO2, Cl2, NOx, NH3, VOCs, mercaptans). Features PSA/PSA-PG fresh-air corrosion-control units (to 68,000 m³/h), DBS/CA indoor recirculation purifiers, and WGP industrial exhaust treatment systems (to 100,000+ m³/h) with deep carbon and chemisorption beds.
Protects sensitive DCS, PLC, and server electronics from corrosive gas attack. Integrates PSA/PSA-PG treated fresh air, positive room pressurization, CA indoor recirculation scrubbers, motorized airtight intake shutoff (≤1.2 m³/(m²·h)), outdoor gas detector interlocks, and Cu/Ag reactivity monitoring.
Aerodynamic momentum ventilation and ductless car-park extraction. Features SDS unidirectional jet fans (191–3,046 N static thrust, Ø630–1600mm), SDS(R) 30-second reversible jet fans, 1D/2D silencers (9–14 dB(A) attenuation), PYHL-14A 280 °C / 30 min induction exhaust, and DTF in-duct station fans.
Coordinates closed-loop pressure maintenance (JFDY bladder tanks 0.20–8.53 m³, JFWP packaged expansion skids 48–480 m³ volume), constant-pressure water supply (JFHB 8–5,500 m³/h, JFWZ non-negative direct mains 8–280 m³/h), custom water manifolds (DN50–DN500), balancing valves, and 100X–900X hydraulic valves.
Pairs thermal heat exchangers with water treatment matched to water chemistry. Features gasketed plate heat exchangers (0.2–500 m²), packaged plate units (0.21–21 MW), JFSW turbulent tube exchangers, U-tube & floating coil storage exchangers (100–15,000 L), JFGP electronic water treatment, induction processors, and RLC softeners.
| Engineering Problem | System Route | YONGFAN Families Typically Involved | First Variables to Confirm |
|---|---|---|---|
| Move and distribute normal ventilation air | Airside Ventilation Systems | Axial, mixed-flow, centrifugal & roof fans; fan boxes; dampers; VAV; plenums; silencers | Airflow, static pressure, sound, control, duct layout |
| Maintain particle-controlled clean air | Cleanroom Air Filtration Systems | Pre-filters, medium filters, HEPA filters, GFK, GCFK, FFU, distribution & control dampers | Cleanliness target, airflow pattern, terminal type, DP |
| Extract smoke and isolate fire zones | Fire & Smoke Exhaust Systems | Smoke fans/fan boxes (HTFC, DTF), FHF 70 °C, PFHF 280 °C, PYF smoke valves, actuators | Fire sequence, temperature duty, airflow, zone logic |
| Remove molecular contaminants from air | Industrial Gas-Phase Filtration | PSA, PSA-PG, DBS, CA, WGP and specialized carbon/chemisorption media | Target gases, concentration, airflow, intake/exhaust duty |
| Protect electronics from corrosive gases | Control Room Corrosion Protection | PSA/PSA-PG, DBS/CA, airtight intake control, gas interlocks & corrosion monitoring | Room leakage, pressurization, gas profile, target G1 |
| Drive air through tunnels & underground | Tunnel & Underground Ventilation | SDS/SDS(R) jet fans, PYHL induction fans, HL3-2A/DTF fans, 1D/2D silencers | Required thrust, tunnel geometry, emissions, fire mode |
| Maintain & distribute hydronic pressure/flow | Hydronic Plant Room Systems | JFDY, JFWP, JFHB, JFWZ, manifolds, balancing valves & 100X–900X hydraulic valves | Flow, pressure, system volume, source pressure, zoning |
| Transfer heat and manage water condition | Heat Exchange & Water Treatment | Plate/tube/storage exchangers, packaged units, JFGP, induction processors, RLC softeners | Heat load, temperatures, fluid, water quality, pressure |
Select Airside, Cleanroom, Fire Smoke, Gas-Phase, Corrosion, Tunnel, Hydronics, or Heat Exchange.
Provide design airflow/flow rates, pressures, thermal loads, or target cleanliness/corrosion classes.
Define duct/piping geometry, power voltages, control signals (0–10V/Modbus/BACnet), and emergency modes.
Specify project compliance standards (AMCA, ISO 16890, ISO 14644, ISA S71.04, 3C Fire, API 598, GB150).
YONGFAN systems engineering team will review component interfaces, calculate pressure budgets, model thermal/aerodynamic behavior, and provide integrated submittal packages.
Fans and dampers verified for airflow, static pressure, dynamic balance, and acoustic regeneration.
Particulate filters tested to ISO 16890 / EN 1822; HEPA/ULPA 100% scan-tested for pinhole leaks.
Exchangers and pressure vessels hydrostatically tested to 1.25–1.5× design pressure per GB150 and API 598.
Electric actuators, VFD skids, and control panels undergo functional signal sweep and interlock checks.
Start with the engineering problem. Use Airside Ventilation for ducted air movement, Cleanroom for particle control, Fire Smoke for emergency duty, Gas-Phase for molecular gases, Hydronics for pressure/flow, and Heat Exchange for thermal duty.
YONGFAN supplies coordinated equipment and component families. These pages help select compatible equipment, but do not claim turnkey central-plant EPC scope.
Yes, by staging particulate filters (G4/F8/HEPA) with activated-carbon or chemisorption chemical media. Particles and molecular gases use different removal mechanisms.
No. Terminal efficiency is only one part. Air-change rate, room pressurization, leakage, airflow distribution, and commissioning determine final ISO cleanliness.
Only if documented and certified for high-temperature duty (such as 280 °C / 30 min). Smoke exhaust must be selected as a life-safety fire requirement.
No. PSA/PSA-PG treat incoming fresh air to protect indoor electronics. WGP is engineered for outgoing contaminated industrial exhaust streams.
Static thrust (N), followed by installed effective thrust which accounts for tunnel air velocity, spacing, and wall friction losses.
JFHB is a VFD constant-pressure booster for break tanks. JFWZ connects directly to municipal mains using non-negative-pressure technology.
Water treatment dramatically reduces scaling and fouling, but exchangers still require scheduled inspection based on water quality.
YONGFAN supplies equipment and component packages; building structural design, fire engineering, and EPC installation remain project responsibilities.
Cleanroom terminals do not independently guarantee ISO 14644 room class without complete architectural envelope and commissioning verification.
Chemical filtration units are designed for ISA S71.04 Class G1 targets, but room sealing and positive pressurization are essential to prevent infiltration.
Direct-mains boosting with JFWZ non-negative-pressure units is subject to local municipal water authority approval.
Connect with YONGFAN application engineers to coordinate fans, filtration, dampers, hydronic pressure maintenance, and heat transfer equipment into a reliable, high-performance specification.
