How to Select the Right Industrial Fan: CFM, Static Pressure & Type Guide
For a quick overview of every fan type before diving into sizing, see our Industrial Fan Types overview.
Fan selection has the same shape as chiller or FCU selection: figure out the airflow and pressure the application needs, then match that to the fan type built for it. This guide walks through that process across the full range of fans Jaideo Automation supplies.
Step 1: How Much Airflow (CFM) Do You Need?
Required airflow depends on the application — air changes per hour for general ventilation, exhaust volume for a process, or make-up air requirements for a car park or tunnel. This is typically calculated during the mechanical design stage based on room volume, occupancy, or process exhaust requirements.
Step 2: How Much Static Pressure Must the Fan Overcome?
Every duct run, filter, grille, and turn adds resistance. A fan sized for airflow alone but not static pressure will underperform once installed — the same principle covered in our Fan Coil Unit Sizing Guide, which applies equally here.
Calculating Static Pressure in Practice
Total static pressure is the sum of resistance from every component in the air path — ductwork friction loss (which scales with duct length and how many bends it has), grilles and diffusers, filters, and any dampers in the line. Each component has a rated pressure drop at a given airflow, usually published on its datasheet; adding these together gives the total static pressure the fan must be selected against. Get this number wrong low, and the fan delivers less airflow than designed once installed — get it wrong high, and the project pays for more fan and more energy than the application needed.
Centrifugal vs Axial vs Inline: A Quick Primer
Before getting into specific comparisons, it helps to place the fan families relative to each other. Centrifugal fans (in backward and forward curved variants) throw air outward at a right angle and handle the highest static pressures. Axial fans push air straight through in line with the shaft, favoring high airflow at low pressure. Inline fans — mixed flow, circular/rectangular, and bifurcated types — sit in between, fitting directly into round or rectangular ductwork while handling more pressure than a basic axial design. Which family fits comes down to where on that pressure/airflow spectrum the application sits.
General Ventilation vs Industrial Process Fans
Not every fan on this list is doing the same kind of job. General ventilation fans — cabinet and standard inline types — typically move room or building air for comfort and air quality. Industrial process fans — jet fans for car parks/tunnels, and bifurcated fans for hot or contaminated airstreams — are specified around a specific process or life-safety requirement rather than general comfort. Confirming which category an application falls into early narrows the fan type choice considerably before getting into CFM and pressure specifics.
Step 3: Match Fan Type to the Application
| Application | Fan type | Guide |
|---|---|---|
| Open space ventilation, car parks, tunnels | Jet fan (induction/impulse) | Jet Fans Explained |
| High static pressure, industrial ducted systems | Backward curved centrifugal fan | Centrifugal Fan Comparison |
| Compact, moderate pressure ducted systems | Forward curved centrifugal fan | Centrifugal Fan Comparison |
| Longer duct runs beyond standard axial capability | Mixed flow inline fan | Mixed Flow Inline Fans |
| Straightforward inline duct runs | Circular or rectangular inline fan | Inline Duct Fan Comparison |
| Hot, contaminated, or corrosive airstreams | Bifurcated fan | Bifurcated Fans Explained |
| Noise-sensitive or serviceability-priority installs | Cabinet fan | Cabinet Fans Explained |
| Straight-through, low-resistance ventilation | Axial flow fan | Axial Flow Fan |
| Air handling units, ducted systems without a housing | Plug/plenum fan | Plug/Plenum Fans |
Step 4: Check Noise Constraints
Fan noise depends on type, speed, and installation — cabinet and silent mixed flow variants exist specifically for noise-sensitive locations. Factor this in early, since retrofitting acoustic treatment after installation is far more expensive than specifying the right fan upfront.
Step 5: Consider Environmental Conditions
Hot, humid, dusty, or corrosive airstreams call for bifurcated designs that keep the motor out of the airflow — see our Bifurcated Fans guide.
Putting It Together
Most fan selection decisions come down to these five factors: airflow, static pressure, application type, noise constraints, and environmental conditions. Jaideo Automation can help walk through the calculation and match it to the right fan type and model for your project.
Frequently Asked Questions
What is the first step in selecting an industrial fan?
The first step is calculating the required airflow (CFM) for the application, based on room volume, occupancy, or process exhaust requirements.
Why does static pressure matter when selecting a fan?
Every duct run, filter, grille, and turn adds resistance, and a fan sized for airflow alone without accounting for static pressure will underperform once installed.
Which fan type is best for car park ventilation?
Jet fans, either induction or impulse type, are typically used for car park and tunnel ventilation since they induce directional airflow across open spaces without requiring ductwork.