A fan that can't build enough pressure won't tell you so. It moves less air than you sized it for, runs hotter than it should, and wears toward an early failure while the nameplate still reads fine. In high-resistance systems, that gap between what you specified and what you get is where an industrial blower earns its place.
If you've already read our piece on industrial blowers vs. fans, you know the line between the two comes down to pressure, not vocabulary. This post picks up where that one leaves off: what a pressure blower is built to do, and how to tell when your system needs one.
When a Standard Fan Runs Out of Room
Every fan has a pressure ceiling. A fan is built to move a large volume of air against relatively low resistance, up to a pressure ratio of about 1.11 by ASME's threshold. Push it past that point and it doesn't just underperform. It moves toward stall, the motor works harder, and heat builds where you don't want it.
A pressure blower is the same family of equipment engineered and operated to develop higher static pressure, generally in the 1.11 to 1.20 range. Go higher than that and you've crossed into compressor territory, which is a different machine with a different job. The practical takeaway: a blower isn't a fan's opposite. It's a fan built to hold pressure where an ordinary one gives it up.
What Makes a Pressure Blower Different
The difference shows up in the wheel and the build. Pressure blowers typically use radial blade designs, with narrower, heavier wheels running at higher tip speeds to generate and hold static pressure. That construction does two things at once: it develops the pressure the system needs, and it stands up to airstreams that would wear a lighter wheel down, including dust, particulate, and material-laden process air.
That's why the same design that handles high pressure also tends to handle dirty air well. Radial wheels are simple, rugged, and forgiving of what's moving through them, which is exactly what demanding process applications ask for.
Where Pressure Blowers Earn Their Keep
You need blower-level pressure when the system puts real resistance in the way of the air. Common cases include:
Combustion air. Feeding burners and process heating equipment where the air has to be delivered at a controlled, higher pressure.
Pneumatic conveying. Moving material through ducting, where the resistance of the load and the run length demands sustained pressure.
Dust collection through long or filtered ductwork. Pulling air through baghouses, cyclones, and extended runs where static pressure climbs quickly.
Drying and process exhaust. Forcing air through scrubbers, carbon filters, or tight process paths that a general-purpose fan can't overcome.
The thread through all of them is system resistance. The more the air has to fight to get where it's going, the more likely you're in blower territory, whatever the equipment gets called on the floor.
Hartzell's Pressure Blower Line: Series 07 and 07T
For the genuinely high-static applications, Hartzell builds the Series 07 pressure blower and the Series 07T turbo pressure blower, radial blade designs engineered for pressures up to 60 inches of static pressure. These are the units for the jobs where a standard fan won't keep up no matter how hard it runs, backed by the same construction standards and the industry's only five-year warranty that carry across the Hartzell line.
How to Spec a Pressure Blower
Don't spec by the word on the drawing. Spec by the numbers your system produces. Bring these to the conversation:
Static pressure. The real resistance across the whole system, not a single component. This is the number that decides fan versus blower.
Airflow at that pressure. CFM measured at your actual operating point, not free-air CFM off a chart.
Airstream composition. Clean, dusty, corrosive, or material-laden. This drives wheel and material selection as much as pressure does.
Temperature. Steady-state and peak, since heat shifts the performance point and sets material limits.
Get those right and the fan-versus-blower question answers itself. Get them wrong and you end up with equipment that works harder than it should, or one that never had the pressure to do the job at all. For the fuller selection picture, our guide to choosing the right industrial fan walks through how these variables fit together.
Talk Through Your Numbers
If you're staring at a spec sheet and aren't sure whether your system needs a fan or a blower, that's a five-minute conversation with one of our application engineers. We'll look at your static pressure and airflow and tell you straight which one the job calls for.
Call 1-800-336-3267 or email info@hartzell.com.
Frequently Asked Questions
What is an industrial pressure blower?
It's an air-moving machine built to develop higher static pressure than a standard fan, typically using a radial blade wheel to push air through high-resistance systems like ductwork, filters, and process equipment.
What's the difference between a pressure blower and a regular industrial fan?
Pressure. A fan runs up to a pressure ratio of about 1.11; a blower is built for roughly 1.11 to 1.20. Above that range is compressor territory. Same family of equipment, tuned for a higher-pressure job.
When do I need a blower instead of a fan?
When your system resistance is high. Long duct runs, filters, scrubbers, combustion air, and pneumatic conveying all build static pressure that a general-purpose fan can't overcome.
What is a turbo pressure blower?
A turbo blower is a high-pressure design for the most demanding static-pressure applications. Hartzell's Series 07T handles pressures up to 60 inches of static pressure.
Can a pressure blower handle dirty air?
Yes. The radial blade wheels used in most pressure blowers are rugged and handle dust, particulate, and material-laden airstreams well, which is why they suit heavy process work.