If you’ve ever spent time talking to mine operators about ventilation, you’ll know it’s not just a box-ticking exercise. It’s the difference between a safe shift and a dangerous one, between workers going home to their families and not. For nearly a decade, I’ve run a business supplying medium pressure blowers to mining operations across North America, and more times than I can count, I’ve been asked a single question that splits a lot of teams: Can medium pressure blowers actually work for mine ventilation? Medium Pressure Blowers
At first, I get the confusion. For years, low pressure axial fans were the go-to for mines—they’re cheap, easy to install, and move huge volumes of air. Then there were high pressure centrifugal blowers, reserved for tasks like exhausting dust from specific seams or powering pneumatic tools. Medium pressure, well, it sort of existed in the middle, often overlooked as neither one thing nor the other. But over the last five years, as mining conditions have gotten tighter, deeper, and more variable, medium pressure blowers have moved from the sidelines to the center of many mine ventilation plans. Let me break down why that shift happened, where they work best, and the biggest mistakes I see operators making when they consider adding them to their setup.
First, let’s get clear on what we’re actually talking about when we say “medium pressure blowers.” Pressure in ventilation systems is measured in pascals (Pa), and while there’s no universal standard for the categories, most industry practitioners group them like this: low pressure is under 1,000 Pa, medium pressure is between 1,000 and 5,000 Pa, and high pressure is anything over 5,000 Pa. Low pressure fans move air efficiently over long, open routes, which is why they’ve dominated main intake systems. But mines have always had sections that aren’t open and straight. They have bends, narrow seams, temporary bulkheads, dust extraction ducts, and sometimes even wet, rough rock surfaces that create what’s called airflow resistance—think of it like friction in pipes, but for air moving through rock.
That resistance is where medium pressure blowers earn their keep. A few years back, I worked with a gold mine in northern Ontario that had a 2.1 km long development drift (the tunnel used to extend mining deeper) that was only 1.8 meters wide. The team had been using two low pressure axial fans in series to push air through, but the bends in the drift and the rough rock walls created so much resistance that the air speed at the far end was barely 0.3 m/s—less than a tenth of the 3 m/s minimum required by Canadian mine safety regulations. They tried adding a third low pressure fan, but that just increased energy use by 40% and created so much noise that workers in the adjacent areas had to wear ear protection even during breaks. When we installed a medium pressure blower at the intake end, paired with a flexible duct along the drift, the air speed at the far end jumped to 3.2 m/s, and total energy use went down by 18%. The difference was simple: medium pressure blowers can overcome that resistance without the need for multiple fan setups, which saves on installation time, maintenance, and power costs.
But it’s not just about development drifts. Let’s talk about the two main types of mine ventilation: primary (or main) ventilation, which moves air through the entire mine, and auxiliary ventilation, which supplies air to individual working faces where the primary system isn’t enough. Most people assume medium pressure blowers only work for auxiliary ventilation, but that’s not true anymore. In some shallow, narrow coal mines, medium pressure blowers are being used as part of the primary system because they can adapt to changes in airflow demand better than high pressure systems. Coal mines, for example, have working faces that advance 10 to 15 meters a week, so the length of the duct running to the face changes constantly. High pressure blowers can handle that, but they’re less flexible—changing the airflow rate means adjusting the impeller speed or making major duct modifications. Medium pressure blowers, on the other hand, have a wider operating range. The same unit that works when the duct is 500 meters long can adjust its output to keep air speed steady when the duct is 1,500 meters long, without the need for extra equipment. That adaptability is a big win for operations that are expanding or modifying their layouts regularly.
Of course, medium pressure blowers aren’t a one-size-fits-all solution, and I’ve seen operators make costly mistakes when they jump on the trend without doing their homework. The first mistake I see is sizing the blower wrong. I had a customer in Wyoming last year who bought a medium pressure blower from a supplier that didn’t specialize in mining equipment, thinking higher pressure was always better. They installed it on a long, wide limestone drift, expecting it to move 12,000 cubic meters per hour (m³/h) of air, but the blower was rated for 8,000 m³/h at their required pressure. They ended up wasting energy because the blower was running at full speed just to move the air they needed, and they had to add a secondary low pressure fan to pick up the slack. The right way to size a medium pressure blower for ventilation is to calculate two things: the total resistance of the route (in Pa) and the required airflow rate (in m³/h). For mines, you also have to account for factors like temperature—hot air is less dense, so it creates less resistance, while cold, dense air creates more—plus the amount of dust or moisture in the air, which can add to friction. That’s why working with a supplier that understands mine conditions, not just general industrial ventilation, is critical.
Another mistake is choosing the wrong type of medium pressure blower. There are two main designs: centrifugal and multistage axial. Centrifugal medium pressure blowers are better for routes with high resistance, like narrow drifts or ducting with lots of bends. They have a more stable airflow output and are less prone to damage from dust, which is a big plus in mines where air is full of fine particles. Multistage axial blowers, on the other hand, are lighter and more compact, making them ideal for temporary setups, like ventilation for a new development face that’s only going to be used for 6 months. A copper mine in Arizona used multistage axial medium pressure blowers last year for a temporary drift, and they saved $12,000 in installation costs compared to using centrifugal units, because they were easier to move as the drift advanced. But if that same mine had used them for a permanent primary ventilation setup, they would have had higher noise levels and more maintenance from dust buildup, since axial blowers are more sensitive to particle contamination.
Noise is another big factor that people don’t talk about enough when it comes to mine ventilation. Mining sites are already loud environments—heavy machinery, rock crushers, haul trucks can all reach 100 dB or more, which is above the occupational safety limit for an 8-hour shift (most regulations cap it at 85 dB). But ventilation blowers are often sited near worker areas, and even 85 dB over an 8-hour shift can cause hearing damage. Here’s where medium pressure blowers have a clear advantage over high pressure ones. High pressure blowers have to run at much higher speeds to create the pressure needed, which generates more noise. Medium pressure blowers run at lower speeds, so they produce less noise—often 10 to 15 dB less than equivalent high pressure setups. That means mine operators can site the blower closer to the intake or even near existing worker facilities without needing extra noise barriers, which saves space and installation time. I worked with a mine in British Columbia that used to have to build a 10-meter sound barrier around their high pressure blower, which cost $35,000 and took two weeks to install. When they switched to medium pressure blowers, they didn’t need the barrier at all, saving both time and money.
Energy cost is another major driver. Mine ventilation accounts for an average of 15 to 20% of a mine’s total energy use, according to the International Council on Mining and Metals (ICMM). That’s a huge number—for a large mine, that can be $2 million to $5 million a year in energy bills. Medium pressure blowers are more energy efficient than both low and high pressure blowers for many mine ventilation tasks. Because they’re sized for the specific resistance of the route, they don’t waste energy moving air faster than needed or working harder than necessary to overcome friction. A 2022 study by the University of Queensland looked at ventilation efficiency in 12 Australian coal mines and found that operations that switched to medium pressure blowers for auxiliary ventilation saw an average energy cost reduction of 22% within the first year. For mines operating on thin margins, that’s the difference between turning a profit and breaking even.
But let’s be honest—there are still scenarios where medium pressure blowers aren’t the right choice. If you have a very long, wide primary ventilation shaft (over 3 km) with almost no bends, low pressure axial fans are still more efficient. If you’re working in a deep mine (over 1,500 meters) with extremely high resistance from rock dust and wet walls, high pressure centrifugal blowers might be better. And if you’re on a very tight budget for a temporary setup that only needs to last a few weeks, low pressure fans are still the cheapest option. The key is not to think of medium pressure blowers as a replacement for other types, but as a complementary tool that fills a gap that’s been missing for a long time.
Over the last decade, I’ve seen too many mine operators stick to old habits just because that’s how things have always been done. They’re scared to try new equipment, or they think it’s too complicated to switch up their ventilation system. But mine conditions are changing—mines are getting deeper, narrower, and more focused on safety and cost efficiency. Medium pressure blowers aren’t just a trend. They’re a practical solution to a real problem that a lot of mines have been ignoring for years.
If you’re a mine operator thinking about upgrading your ventilation system, don’t just take my word for it. Do the math: calculate your current energy use, the air speed at the ends of your drifts, and the maintenance costs for your existing fans. Compare that to what a medium pressure blower would do for your specific setup. You might be surprised at how much you’re missing out on. I’ve worked with mines that thought their ventilation problems were unavoidable, only to fix them with a simple switch to medium pressure blowers. The workers get safer air, the operators save money, and everyone goes home at the end of the day. That’s the kind of win-win that makes this work worth doing.
If you’re looking to learn more about how medium pressure blowers could work for your mine, or if you have a specific challenge you’re trying to solve, reach out to our team. We’ve worked with mines across different commodities and conditions, and we can help you figure out the right setup without the guesswork. Mine ventilation isn’t something you should cut corners on, and you don’t have to do it alone.
Duct Axial Fans References:
- International Council on Mining and Metals. (2021). Global Mine Ventilation Best Practices. ICMM Publications, London, UK.
- University of Queensland Sustainable Minerals Institute. (2022). Ventilation Efficiency Improvements in Australian Coal Mines. SMI Research Report Series, Brisbane, Australia.
- Mine Safety and Health Administration (MSHA). (2020). Ventilation Standards for Metal and Non-Metal Mines. U.S. Department of Labor, Washington, DC.
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