Vane-axial (Van Axial) belt driven fans with aerodynamic guide vanes that recover swirl energy — delivering significantly higher static pressure than standard tube axial fans for the same power input. Motor outside airstream. IS 3588 compliant manufacturer from Mumbai, India.
Belt Driven Van Axial Fan — Manufacturer & Supplier, India
Vayuvents manufactures Belt Driven Van Axial (Vane Axial) Fans with inlet and outlet guide vanes for higher static pressure. Motor outside airstream, IS 3588 compliant. Manufacturer & supplier Mumbai.
A Belt Driven Van Axial Fan — also called a vane-axial fan — is an axial fan fitted with fixed aerodynamic guide vanes downstream of the rotating impeller (and sometimes upstream as well). These guide vanes convert the rotational (swirl) velocity component of the airstream leaving the impeller into static pressure — significantly increasing the fan's ability to overcome duct resistance compared to a simple tube axial fan without vanes.
The result is a fan that achieves substantially higher static pressure (up to 60 to 80 mmWG) at comparable airflow rates to a standard tube axial fan, while maintaining the compact axial profile. This makes the van axial configuration the preferred choice for ventilation systems with moderate-to-high duct resistance — paint booths, pressurised clean rooms, air handling systems, and industrial process air handling with significant ductwork.
Vayuvents manufactures belt driven van axial fans from 305 mm to 1,530 mm diameter with guide vane sets designed aerodynamically to match each impeller's rotational profile. The motor is mounted outside the casing on a belt-drive bracket — all the thermal and chemical protection advantages of belt drive apply.
Available in MS, FRP, and SS construction. Flameproof Ex-d motor variants available for Zone 1 and Zone 2 paint booth and process exhaust applications.
Key Features & Benefits
Aerodynamic Guide Vanes
Fixed guide vanes downstream of impeller convert swirl energy to static pressure — 30 to 60% higher static pressure than tube axial fans of the same size and speed.
Higher Pressure Capability
Achieves 40 to 80 mmWG static pressure — bridges the gap between low-pressure axial fans and high-pressure centrifugal fans for medium-resistance duct systems.
Motor Outside Airstream
Belt drive keeps motor on external bracket — all benefits of belt drive (temperature, chemical, dust protection) apply to the van axial configuration.
Adjustable Speed
Pulley ratio adjustment allows fine-tuning of fan speed and pressure output to match specific duct system resistance curve.
Compact Axial Profile
Despite higher pressure output, the van axial retains the compact circular cross-section of a tube axial fan — fits the same duct dimensions as a standard tube axial.
Chemical-Resistant Options
FRP or SS casing and impeller for chemical fume and corrosive process exhaust duct service with higher duct resistance.
Replaceable Guide Vanes
Guide vanes are individually replaceable without removing the complete fan — reduces maintenance downtime in chemical plant service where vane corrosion occurs.
IS 3588 Compliant
Performance tested per IS 3588-1987 with airflow, pressure, and efficiency test certificate confirming vane performance benefit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Fan Diameter Range | 305 mm to 1,530 mm |
| Static Pressure Range | Up to 60-80 mmWG (vane-assisted) |
| Airflow (Free Air) | 2,300 m³/hr to 95,000 m³/hr |
| Motor Power Range | 0.25 HP to 30 HP |
| Drive Type | V-belt and pulley, motor on external casing bracket |
| Guide Vanes | Fixed aerodynamic aerofoil vanes, downstream of impeller |
| Casing Material | MS / FRP / SS304 |
| Impeller Material | Aluminium / FRP / SS304 |
| Airstream Temp | Up to 150°C (MS) | Up to 300°C (high-temp alloy) |
| Standards | IS 3588-1987 | IS 4894 |
Airflow Performance — Model Range
Free air delivery (m³/hr) at increasing static pressure (mm WG), across the full model range.
| Sr | Model | Dia (mm) | Motor (HP/Pole) | RPM | Free Air (m³/hr) | @10 mmWG | @15 mmWG | @20 mmWG | @25 mmWG | @30 mmWG |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | BD-75-28-120 | 305 | 0.75/2P | 2800 | 2,300 | 2,000 | 1,750 | 1,400 | - | - |
| 2 | BD-50-14-180 | 460 | 0.50/4P | 1440 | 6,750 | 5,500 | 4,400 | - | - | - |
| 3 | BD-100-28-180 | 460 | 1.0/2P | 2880 | 9,000 | 7,500 | 6,200 | - | - | - |
| 4 | BD-100-14-240 | 612 | 1.0/4P | 1440 | 12,000 | 11,000 | 10,900 | 9,500 | - | - |
| 5 | BD-200-28-240 | 612 | 2.0/2P | 2800 | 15,500 | 13,600 | 13,000 | 11,300 | - | - |
| 6 | BD-150-14-280 | 712 | 1.5/4P | 1440 | 17,500 | 15,000 | 13,900 | 12,500 | 11,800 | 10,000 |
| 7 | BD-300-28-280 | 712 | 3.0/2P | 2880 | 20,000 | 18,500 | 16,900 | 16,000 | 15,000 | 14,500 |
| 8 | BD-300-96-360 | 915 | 3.0/6P | 960 | 45,000 | 42,000 | 39,000 | 37,000 | 34,000 | - |
| 9 | BD-500-14-360 | 915 | 5.0/4P | 1440 | 40,000 | - | - | 38,000 | 35,000 | 32,000 |
| 10 | BD-500-96-400 | 1015 | 5.0/6P | 960 | 48,000 | 45,000 | 43,000 | 42,000 | - | - |
| 11 | BD-750-14-400 | 1015 | 7.5/4P | 1440 | 55,000 | 49,000 | 47,000 | - | - | - |
| 12 | BD-750-96-480 | 1220 | 7.5/6P | 960 | 65,000 | - | 58,000 | 55,000 | 34,500 | 30,500 |
| 13 | BD-100-960-480 | 1220 | 10/6P | 960 | 69,000 | - | - | 65,000 | 61,500 | 60,000 |
| 14 | BD-150-960-600 | 1530 | 15/6P | 960 | 75,000 | - | - | - | - | 80,000 |
| 15 | BD-300-14-600 | 1530 | 30/4P | 1440 | 95,000 | - | - | - | - | - |
| 16 | BD-300-96-720 | 1830 | 30/6P | 960 | 1,20,000 | - | - | - | - | - |
| 17 | BD-500-14-720 | 1830 | 50/4P | 1440 | 1,50,000 | - | - | - | - | - |
Fan speed independently adjustable via pulley ratio — airflow customisable without changing motor. Fan selection based on air at 20°C, density 1.2 kg/m³. Performance and tolerance as per IS 3588-1987. Custom sizes and intermediate performance points available on request.
Product Images
Where It Is Used
HIGH-RESISTANCE VENTILATION
- Paint Spray Booth: Exhaust with higher duct resistance requiring elevated static pressure.
- Pressurised Clean Rooms: Positive pressure differential requiring higher fan pressure.
- Air Handling Units: Supply and return air handling with filter and coil resistance.
- Tunnel & Car Park: Longer duct runs requiring higher static pressure.
- Chemical Plant Extraction: Scrubber-connected duct systems with high resistance.
- Pharmaceutical Pressurisation: HEPA filter resistance in clean room supply air systems.
SPECIALIZED HIGH-PRESSURE APPLICATIONS
- Data Centre Pressurisation: Underfloor plenum supply air with high resistance.
- Marine Cabin Ventilation: Compact higher-pressure fans for naval and commercial vessels.
- Gas Turbine Rooms: High-resistance enclosed duct systems for engine room ventilation.
- Mine Ventilation: Auxiliary fan in headings with high airway resistance.
- Cold Rooms: Air supply overcoming coil resistance in refrigerated spaces.
- Hospital Operating Theatres: Positive pressure ventilation supply systems.
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FAQs — Belt Driven Van Axial Fan
The key advantage is that the motor is mounted outside the airstream on a separate bracket. This means the motor never contacts the hot, corrosive, or dust-laden air being handled — dramatically extending motor life in paint shop, chemical plant, high-temperature, and dusty process service where direct-drive motors would overheat or corrode rapidly. Belt drive also allows the fan speed to be set independently of the motor speed by changing pulley diameters.
With the motor outside the airstream and a suitable impeller and casing material, belt driven axial fans handle airstream temperatures up to 300°C continuously. Standard MS impeller and casing are suitable up to 150°C. For 150°C to 300°C, high-temperature alloy impeller and casing with high-temperature grease bearings are used. Above 300°C, centrifugal fans with water-cooled bearings are typically preferred.
Fan speed is adjusted by changing the pulley diameter ratio between the motor pulley and the fan shaft pulley. A larger motor pulley or smaller fan pulley increases fan speed; a smaller motor pulley or larger fan pulley decreases it. Vayuvents supplies fans with the pulley ratio pre-set for the required operating point, and can supply alternative pulleys for field speed adjustment if the airflow requirement changes after installation.
For chemical fume exhaust service, Vayuvents supplies: (1) FRP (fibre-reinforced plastic) impeller and casing for acid fumes, HCl, H2SO4, and general chemical exhaust; (2) PP (polypropylene) impeller for moderate chemical service; (3) SS304 or SS316L impeller and casing for food, pharmaceutical, and moderately corrosive service. The motor remains outside the corrosive airstream regardless of impeller material.
Yes. For Zone 1 and Zone 2 hazardous classified areas, Vayuvents supplies belt driven fans with IS 5572 / ATEX flameproof Ex-d motors and non-sparking aluminium or GRP impellers. The belt drive configuration is advantageous in hazardous areas because it allows the motor to be positioned outside the hazardous zone boundary in some installations, reducing the motor certification requirement.
Belt driven fans require: (1) V-belt tension check every 3 months — a slack belt slips and reduces fan speed, a tight belt overloads motor bearings; (2) V-belt replacement every 12 to 18 months under normal service; (3) fan shaft bearing lubrication every 6 months for re-greasable bearings; (4) impeller cleaning every 3 to 6 months to prevent imbalance from dust accumulation. Belt drive adds modest maintenance compared to direct drive but provides substantial benefits in high-temperature and chemical service.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the airstream temperature, chemical composition if corrosive, required airflow in m³/hr, static pressure in mmWG, and any special requirements (flameproof, high-temperature, corrosion-resistant). We will provide a technical selection and commercial proposal within 24 hours.