Belt Driven Fans — Complete Range by Vayuvents — Manufacturer & Supplier, India
Vayuvents manufactures Belt Driven Fans — axial, tube axial, long shell, and van axial configurations — for high-temperature, corrosive, and hazardous industrial service. 305 mm to 1,830 mm dia. IS 3588 compliant. Mumbai. Call +91 90961 88703.
Belt driven fans transmit motor power to the fan shaft via V-belts and pulleys — the defining feature being that the motor is mounted externally, completely outside the airstream. Vayuvents manufactures the complete range of belt driven fan configurations at our Vasai, Mumbai works: axial, tube axial, long shell, and van axial (vane-axial).
The motor-outside-airstream design is the critical advantage for demanding industrial service. Paint shop exhaust, boiler combustion air, chemical plant fume extraction, furnace draught, and pharmaceutical dryer exhaust all expose a direct-drive motor to conditions that rapidly cause failure — heat, solvent vapours, chemical attack, and heavy dust. Belt drive eliminates these exposures by keeping the motor in clean, cool ambient air throughout its life.
Vayuvents belt driven fans are available from 305 mm to 1,830 mm diameter in MS, FRP, and SS construction, handling airflows from 2,300 m³/hr to 1,50,000 m³/hr and static pressures up to 80 mmWG (van axial configuration). All fans are designed and tested per IS 3588-1987. Flameproof Ex-d motor variants for Zone 1 and Zone 2 service.
We export to UAE, Saudi Arabia, Qatar, Oman, and other countries with full IS 3588 documentation. Custom configurations including FRP impellers, high-temperature alloy casings, and stainless steel construction are available to order.
Key Features & Benefits
Motor Outside Airstream
Belt drive keeps the motor on an external bracket — completely out of the airstream. Eliminates motor overheating in high-temperature, dusty, or corrosive service where direct-drive motors would fail.
Adjustable Speed
V-belt and pulley drive allows fan speed to be set independently of motor speed by changing the pulley ratio — fine-tune airflow without changing motor or fan.
High-Temperature Service
Motor outside the hot airstream handles temperatures that would damage direct-drive motors — up to 300°C gas temperature with suitable impeller and casing material.
Corrosion-Resistant Options
FRP, PP, or SS casing and impeller options for chemical fume, acid vapour, and marine exhaust service where standard MS construction is unsuitable.
IP55 Motor Protection
IP55 TEFC motor on external bracket in clean ambient air — better motor life than direct-drive motors exposed to process heat and contamination.
Separate Maintenance Zones
Motor serviced from outside the fan casing without entry into the duct or airstream — safer and more convenient maintenance in chemical and process plant service.
Wide Airflow Range
305 mm to 1,830 mm diameter covers 2,300 m³/hr to 1,50,000 m³/hr — suits every industrial ventilation and process air requirement.
IS 3588 Compliant
Performance tested per IS 3588-1987 with test certificate confirming stated airflow and pressure at the selected operating point.
Technical Specifications
| Parameter | Specification |
|---|---|
| Fan Diameter Range | 305 mm to 1,830 mm |
| Airflow (Free Air) | 2,300 m³/hr to 1,50,000 m³/hr |
| Motor Power Range | 0.25 HP to 50 HP |
| Drive Type | V-belt and pulley with adjustable motor base |
| Speed Adjustment | Variable — by changing pulley ratio |
| Motor Enclosure | IP55 TEFC (standard) |
| Motor Insulation | Class F |
| Power Supply | 415V 3-Phase 50Hz |
| Impeller Material | Aluminium alloy die-cast / MS / FRP |
| Casing Material | MS fabricated, epoxy primer + finish coat |
| Standards | IS 3588-1987 | IS 4894 |
Airflow Performance — 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.
- Performance based on air at 20°C, density 1.2 kg/m³, per IS 3588-1987.
- Custom sizes and intermediate performance points available on request.
Product Images
Where It Is Used
- Paint spray booth exhaust — high-solvent vapour concentration in hot paint shop environments
- Boiler and furnace combustion air supply — high-temperature airstream service
- Kiln exhaust and process gas handling — cement, ceramic, and mineral processing
- Chemical plant fume exhaust — corrosive vapours requiring FRP or PP construction
- Textile stenter machine airstream — hot, lint-laden air from fabric drying
- Hot air recirculation in drying ovens — paint curing, food drying, pharmaceutical
- Cement and mineral plant dedusting airstream — dusty, abrasive exhaust
- Pharmaceutical solvent exhaust — temperature and chemical compatibility critical
- Marine engine room exhaust — hot, humid, salt-laden airstream service
- Tunnel ventilation — high-temperature emergency smoke extract service
- Fume extraction from furnaces and heat treatment equipment
- Agricultural dryer and grain drying systems — high-temperature ambient air
You May Also Need
Belt Driven Axial Fan
Standard open-casing belt drive — general industrial exhaust and supply.
View Details →Belt Driven Long Shell Fan
Extended casing for direct boiler flue and furnace stack insertion.
View Details →Belt Driven Van Axial Fan
Vane-axial with guide vanes for higher static pressure duct systems.
View Details →FAQs — Belt Driven Fans — Complete Range by Vayuvents
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.