Factory-direct OEM/ODM solutions engineered in Dezhou, Shandong. Tested under stringent dynamic balancing and acoustic specifications to guarantee energy efficiency and high static pressure performance.
Combines high airflow of axial designs with radial static pressure generation for tight duct layouts.
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Double-skin insulated steel casing engineered for ultra-quiet indoor plant rooms and office towers.
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Dual-use emergency ventilation certified to operate under 280°C fire smoke conditions for over 2 hours.
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Large-diameter impellers designed for subterranean tunnels, multi-tier car parks, and high-rise atriums.
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Galvanized structural casing with precision fusible links to isolate fire zones automatically in ducts.
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Sealed coil design prevents fluid contamination and scaling, pairing perfectly with HVAC chillers.
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Space-efficient rooftop counterflow design manufactured in heavy FRP or hot-dip galvanized steel.
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SUS304/SUS316 modular welded hydraulic storage for fire sprinkler reserves and potable industrial loops.
Product DetailsModern building envelopes require a transformative shift from commodity fan hardware to integrated aerodynamic systems balancing acoustic attenuation, pressure optimization, and strict carbon-reduction mandates.
As municipal building codes align with Net Zero 2050 targets, Specific Fan Power (SFP) thresholds are rigorously enforced. Our custom duct fan configurations utilize backward-curved 3D aerofoil impellers and EC (Electronically Commutated) motors to lower wire-to-air energy losses by up to 34% compared to legacy forward-curved blowers.
Dense complex buildings—such as semiconductor cleanrooms, modern data centers, and multi-tier logistics hubs—suffer extensive static pressure losses across HEPA filters, silencers, and fire dampers. Our mixed-flow inline blowers combine axial volumetric capacity with the static pressure resistance of centrifugal designs to prevent motor stalling.
Under emergency fire conditions, duct fan failure is not an option. Certified to EN 12101-3 and GB 50016 benchmarks, our dual-purpose high-temperature smoke extraction fans seamlessly switch from standard comfort HVAC to emergency high-temperature exhaust, venting toxic combustive gases at 280°C or 300°C for over 120 minutes continuous run-time.
From computational fluid dynamics (CFD) impeller shaping to dynamic dynamic balancing complying with ISO 1940-1 Grade G2.5, every duct fan is precision manufactured for endurance.
| Fan Architecture | Static Pressure Range | Acoustic Level (dB-A) | Ideal Duct Configuration | Key Engineering Advantages |
|---|---|---|---|---|
| Industrial Mixed-Flow Inline Fan | 250 – 1,200 Pa | 52 – 68 dB(A) | Straight-through circular/rectangular ducts | Combines high flow velocity with diagonal pressure boost; 35% smaller footprint than centrifugal cabinets. |
| Soundproof Cabinet Ventilation Fan | 150 – 850 Pa | 38 – 54 dB(A) | Indoor plant rooms, ceiling voids, schools | Double-skin perforated zinc-coated steel housing filled with 50mm high-density acoustic mineral wool. |
| Dual-Duty Fire Smoke Exhaust Axial Fan | 300 – 1,800 Pa | 65 – 82 dB(A) | Dedicated smoke shafts, underground tunnels | Class H motor insulation, cast-aluminum aerodynamic blades, rated 280°C/2h or 300°C/2h fire endurance. |
| High-Pressure Centrifugal Duct Blower | 500 – 3,500 Pa | 60 – 76 dB(A) | Long-run industrial duct networks, scrubbers | Backward-curved non-overloading wheel geometry; handles heavy particulate loads without balance loss. |
To resist severe industrial environments, our fan casings are laser cut and CNC seam-welded from premium hot-dip galvanized steel (DX51D+Z275), SUS304, or marine-grade SUS316L. For corrosive chemical exhaust or coastal offshore installations, our factory applies ISO 12944 certified C4/C5-M high-build epoxy or fluorocarbon coatings, tested against 1,000+ hours of continuous neutral salt spray.
Rotating machinery failure is frequently triggered by resonant vibration. Each impeller undergoes two-plane computerized dynamic balancing in accordance with ISO 1940-1 Grade G2.5 parameters. Heavy-duty internal motors rest on oil-resistant neoprene vibration isolators, eliminating structural rumble transmissions into the building's ducted air distribution trunk.
Our HVAC duct fans, cooling towers, and fire protection equipment are deployed globally across commercial infrastructure, harsh manufacturing facilities, and municipal utility networks.
Challenge: High-density server server rooms generate massive localized heat pockets requiring high-volume heat dissipation without disrupting cold/hot aisle containment balance.
Solution: Modbus-controlled inline EC duct blowers combined with our closed-circuit cooling towers deliver precision CFM modulation based on real-time server rack delta-T metrics.
Challenge: Confined underground environments require continuous carbon monoxide (CO) dilution and high-thrust smoke clearance during subterranean vehicle fires.
Solution: ODM high-flow fire smoke exhaust axial fans with automatic 280°C fire dampers integrated into central SCADA life-safety systems across Southeast Asian metro hubs.
Challenge: Strict ISO 14644 cleanroom classes require zero particulate contamination, laminar air continuity, and hermetically sealed duct lines without motor oil mist.
Solution: Factory-sealed soundproof cabinet duct fans featuring zero-VOC internal seals, direct-drive maintenance-free motors, and precision static pressure maintenance for HEPA filter banks.
Exporting to over 30 countries across Southeast Asia, the Middle East, Europe, and the Americas, our manufacturing protocols are structured around complete regulatory harmonization.
Acoustic and aerodynamic ratings audited under AMCA 210 and AMCA 300 test chamber standards. CE Machinery Directive compliant for European Union installations.
Support for pre-shipment factory acceptance testing (FAT) witnessed by international inspection agencies including SGS, TÜV Rheinland, and Bureau Veritas.
Custom multi-tap motor windings configured for universal overseas power networks: 220V/380V/415V/460V at 50Hz or 60Hz, with UL-compliant terminal wiring.
VCI vapor-corrosion barrier wrapping, internal desiccant packs, and heavy-duty ISPM-15 heat-treated plywood crating ensure zero transit corrosion.
Continuous R&D investments at Shandong Fengdun Environmental Technology Co., Ltd. ensure our airflow hardware adapts to smart autonomous facility infrastructure.
Integration of embedded tri-axial MEMS accelerometers and RTD thermal sensors inside fan motor bearing housings to stream live vibration spectrograms via MQTT/BACnet.
Adopting owl-wing inspired serrated trailing blade edges to break up tip vortex shedding, slashing broadband turbulent noise generation by an additional 4 to 6 dB(A).
Replacing cast aluminum wheels with carbon-fiber reinforced resin matrixes in large axial duct fans, decreasing rotational moment of inertia by 45% for instant VFD throttling.
Providing HVAC consulting engineers with complete parametric Revit BIM objects embedded with live fan curves, accurate acoustic spectrums, and electrical wiring schematics.
Direct technical clarity regarding duct fan sizing, static pressure allowances, smoke emergency compliance, and factory custom manufacturing.
Centrifugal duct fans redirect airflow 90 degrees, developing high static pressure across substantial duct resistances, but requiring larger cabinet space. Mixed-flow fans utilize a conical hub and twisted blades to guide air axially with a radial centrifugal vector, providing straight-through airflow, high CFM volume, and medium-to-high pressure with a 30-40% reduced physical footprint.
Every custom duct fan batch is performance evaluated in accordance with AMCA 210 laboratory test code for airflow, static pressure, and motor brake horsepower, alongside AMCA 300 for sound power level spectrums. Comprehensive test certificates, dynamic balancing reports (ISO 1940 G2.5), and third-party witness FAT documents are provided prior to commercial shipping.
Yes. Our dual-speed and VFD-compatible fire smoke exhaust axial and mixed flow units operate at low rotational speeds during normal daily air exchange. Upon receiving an emergency trigger from the fire alarm control panel, the motor automatically switches to high-speed mode, exhausting smoke at 280°C for up to 120 minutes without thermal failure.
We offer heavy-gauge SUS304 and SUS316L stainless steel housings with pickled and passivated welds, as well as galvanized steel coated with ISO 12944 compliant C5-M marine-grade epoxy or electrostatic fluorocarbon powder coatings. These provide superior longevity against coastal salt fog, swimming pool chlorine, and industrial chemical fumes.
From inline duct blowers and acoustic air cabinets to evaporative cooling towers and municipal-grade water storage tanks, source factory-direct from our Dezhou manufacturing hub.
Compact aerofoil blades engineered for factory ventilation and high-static commercial air duct runs.
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Acoustically lined multi-wing centrifugal impellers designed for quiet operation under 50 dB(A).
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Dual-speed emergency ventilation meeting critical international fire safety standards.
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Custom aerodynamic pitch settings for tunnels, underground subways, and multi-story parking structures.
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Automated spring-return and motorized actuator configurations designed for rapid smoke barrier cutoff.
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High-temperature sintered vitreous enamel lining offering zero corrosion for large municipal potable reserves.
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High-strength underground structural tanks preserving surface ground area while meeting fire water requirements.
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Heavy-duty heat exchange coils for clean industrial process fluid loops, furnace cooling, and HVAC plants.
Product DetailsPrior to custom manufacturing, our engineering department confirms your precise operating duty points to eliminate aerodynamic stall, excessive acoustic resonance, and motor overload.
Total Airflow Volume (m³/h or CFM), Total External Static Pressure (ESP in Pa or in. w.g.), Air Velocity (m/s), and Expected Air Stream Temperature Range.
Operational Voltage (e.g. 380V/400V/460V), Grid Frequency (50Hz / 60Hz), Phase (1-Phase / 3-Phase), VFD compatibility, and IE3/IE4/IE5 or EC motor demands.
Maximum allowable sound power/pressure level (dBA at 1.5m), Double-skin acoustic attenuation thickness, and Fire Smoke emergency certification level (280°C/2h).
