Air filtration is essential in any modern manufacturing setup—but it often comes at a hidden cost: excessive energy consumption. Traditional filtration systems run at constant speed, regardless of how much extraction and filtration is actually required at any given moment. This not only drives up electricity bills but also increases wear and tear on equipment.
At Span Filtration Systems (SFS), we’ve re-engineered the approach. Our Green Filters, equipped with Variable Frequency Drives (VFDs) and smart airflow control, adapt in real time to process demands—delivering up to 30% savings in energy costs.
Let’s break down how it works.
The Problem: Fans That Don’t Know When to Stop
In many factories, air filtration fans are sized for peak load—and then left to run at full speed all day. Whether the process is running light, idle, or under maintenance, the fan keeps pulling maximum power. For a typical 15 kW fan motor, this leads to:
● High energy bills
● Unnecessary extraction
● Premature motor and filter wear
● No control over performance or cost
The Solution: Smart Fan Speed with VFDs
Variable Frequency Drives (VFDs) are the heart of our Green Filter energy-saving strategy. Here’s what they do:
● Continuously monitor air demand (dust, mist, smoke load)
● Based on pressure changes in the line adjusts fan motor speed to match real-time needs
● Ramp down during idle periods, and ramp up only when required
● Maintain optimum airflow while consuming only as much power as needed
The Science Behind the Savings
Here’s the key principle:
Fan power consumption is proportional to the cube of its speed.
So, if you reduce the fan speed by:
● 10%, you save ~27% energy
● 20%, you save ~50% energy
● 30%, you save nearly 66% energy
That means even small speed reductions yield massive power savings. For a 15 kW fan motor, a smart VFD can easily help you avoid hundreds of units of electricity every month.
Real-World Impact
At SFS, we’ve seen customers report:
Up to 30% lower electricity bills on filtration systems
Less strain on fan motors and filter media (longer lifespan)
Lower CO₂ emissions, supporting decarbonisation targets
This isn’t theory, it’s engineered into every Green Filter we offer.
In an era where energy costs are rising and carbon emissions are under scrutiny, intelligent filtration systems offer more than clean air, they offer competitive advantage.
SFS Green Filters don’t just purify, they optimize. And it starts with a fan that knows when to slow down.
