Belt Driven Cabinet Fans
Heavy-duty belt-driven cabinet fan for kitchen, smoke-spill and pressurisation duty — indoor and outdoor.
About the Belt Driven Cabinet Fans
When system resistance climbs above 30 mmwg or when on-site speed changes are needed, the belt-driven cabinet fan steps in. A separately-mounted motor drives the impeller through V-belt(s) and adjustable pulleys, so the same fan can be re-tuned for a different airflow simply by swapping a sheave — no VFD required. The split motor compartment also means the motor never sees the conveyed air, making this design well-suited to kitchen, smoke and contaminated-air duty.
Engineering Advantages
Speed adjustment by pulley change — no VFD needed
Motor isolated from the air stream, ideal for kitchen, smoke and contaminated air
Higher static-pressure capability than direct-drive cabinet fans
Outdoor-rated weatherproof variant available
Key Features
- Indoor and outdoor use
- Easy installation in ducted and non-ducted systems
Construction & Materials
- Heavy-gauge galvanised steel cabinet with bolted access panels
- Backward-inclined, statically + dynamically balanced steel or aluminium impeller
- Cast-iron pillow-block bearings rated L10 ≥ 60,000 hours
- Adjustable taper-lock pulleys and matched V-belt set
- IP 55 TEFC motor mounted on adjustable slide rails for belt-tension setting
How to Choose the Right Variant
- 1Use this design when total static pressure is ≥ 40 mmwg or duty is dirty/hot
- 2Select pulley ratio so the fan runs at the rpm matching your design point on its curve
- 3Allow access on the drive side for belt inspection and replacement
- 4For smoke-spill duty, specify a high-temperature variant rated for the building code
Installation Notes
- Mount on a concrete inertia base with spring isolators for vibration-sensitive sites
- Always install flexible duct connectors at inlet and outlet
- Set belt tension so a thumb-press deflects the belt by ~12 mm at midpoint of the span
- Check pulley alignment with a straight-edge — misalignment kills belts in weeks
Maintenance Schedule
- Inspect belts every 3 months; replace as a matched set when worn
- Re-tension belts after first 24 hours of running
- Lubricate pillow-block bearings every 6 months with appropriate grease
Industries Served
Standards & Compliance
- Designed in line with AMCA 99 fan classifications
- Smoke-spill variants follow IS 16182 / NBC 2016 guidance where applicable
- V-belt drive selection per IS 3142
Frequently Asked Questions
How often do belts need replacing?
Typical V-belt life is 18–36 months under continuous duty, depending on tension, alignment and load. We recommend a yearly inspection and proactive replacement at the first sign of glazing or cracks.
Can the same cabinet handle both supply and smoke-spill duty?
Only if specified up front. Smoke-spill fans need motor and bearings rated for high temperatures (typically 250–300 °C for set durations) — call this out before order.
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Need help selecting the right fan?
Our engineers will help you size the belt driven cabinet fans to your exact application — capacity, static pressure, and installation constraints.
