1-Pole vs 2-Pole vs 4-Pole Fans: What's the Difference and Which One Do You Need?
Learn the difference between 1-pole, 2-pole, and 4-pole fans, including motor speed, torque, noise, lifespan, and how to choose the right fan for your application.
Blauberg
Blauberg Turbo Mixed Flow Inline AC Exhaust Fan - 150MM (6" Inch) | 2 Speed
Air Flow 565 M³/H | Power Consumption 50W | IPX4
AC Infinity
AC Infinity Inline Duct EC Fan Cloudline Pro S6 - 150MM (6" Inch)
Air Flow 688 M³/H | Power Consumption 70W | IP44
Blauberg
Blauberg Turbo EC Mixed Flow Fan - 150MM (6" Inch) | w/ Speed Controller & Lead and Plug
Air Flow 600 M³/H | Power Consumption 55W | IPX4
AC Infinity
AC Infinity Inline EC Exhaust Fan Cloudline Pro T8 - 200MM (8" Inch)
Air Flow 1370 M³/H | Power Consumption 180W | IP44
Blauberg
Blauberg Turbo Mixed Flow Inline AC Exhaust Fan - 100MM (4" Inch) | 2 Speed
Air Flow 245 M³/H | Power Consumption 37W | IPX4
AC Infinity
AC Infinity Inline Duct EC Fan Cloudline Pro S4 - 100MM (4" Inch)
Air Flow 348 M³/H | Power Consumption 28W | IP44
AC Infinity
AC Infinity Inline EC Exhaust Fan Cloudline Pro T6 - 150MM (6" Inch)
Air Flow 688 M³/H | Power Consumption 70W | IP44
Fantech
Fantech Provent In-line Duct Mounted AC Exhaust Fan - 150MM (6" Inch)
Air Flow 562 M³/H | Power Consumption 50W | IP44
Fantech
Fantech Jetline In-line Duct Mounted AC Exhaust Fan - 315MM (12" Inch)
Air Flow 1610 M³/H | Power Consumption 215W | IP44
Blauberg
Blauberg Turbo Mixed Flow Inline AC Exhaust Fan - 200MM (8" Inch) | 2 Speed
Air Flow 1035 M³/H | Power Consumption 110W | IPX4
Blauberg
Blauberg Turbo Mixed Flow Inline AC Exhaust Fan - 250MM (10" Inch) | 2 Speed
Air Flow 1400 M³/H | Power Consumption 177W | IPX4
Ventair
Air Flow 561 M³/H | Power Consumption 40W | IPX4
Vivosun
Vivosun AeroZesh S6 Inline EC Fan - 150MM (6 Inch) w/ GrowHub E42A WiFi Controller
Air Flow 688 M³/H | Power Consumption 35W
Vivosun
Vivosun AeroZesh S8 Inline EC Fan - 200MM (8 Inch) w/ GrowHub E42A WiFi Controller
Air Flow 1410 M³/H | Power Consumption 75W
AC Infinity
AC Infinity Inline Duct EC Fan Cloudline Pro S8 - 200MM (8" Inch)
Air Flow 1370 M³/H | Power Consumption 180W | IP44
Blauberg
Blauberg Turbo EC Mixed Flow Fan - 200MM (8" Inch) | w/ Speed Controller & Lead and Plug
Air Flow 1040 M³/H | Power Consumption 123W | IPX4
AC Infinity
AC Infinity Inline EC Exhaust Fan Cloudline Pro T4 - 100MM (4" Inch)
Air Flow 348 M³/H | Power Consumption 28W | IP44
Ventair
Ventair Inline Mixed Flow AC Exhaust Fan - 100 | 100MM ( 4" Inch) | w/ Mounting Bracket
Air Flow 240 M³/H | Wattage 30W | IPX4
Ventair
Ventair Axial inline Exhaust Fan - Inline 100 | 100MM (4" Inch)
Air Flow 119 M³/H | Wattage 18W | IP44
Fantech
Fantech Jetline In-line Duct Mounted AC Exhaust Fan -100MM (4" Inch)
Air Flow 260 M³/H | Power Consumption 19W | IP44
Fantech
Fantech Jetline In-line Duct Mounted AC Exhaust Fan - 150MM (6" Inch)
Air Flow 750 M³/H | Power Consumption 83W | IP44
Fantech
Fantech Jetline In-line Duct Mounted AC Exhaust Fan - 250MM (10" Inch)
Air Flow 1280 M³/H | Power Consumption 160W | IP44
Fantech
Fantech Jetline Eco In-line Duct Mounted EC Exhaust Fan - 150MM (6" Inch)
Air Flow 680 M³/H | Power Consumption 83W | IP44
Fantech
Fantech Jetline In-line Duct Mounted AC Exhaust Fan - 200MM (8" Inch)
Air Flow 1080 M³/H | Power Consumption 125W | IP44
Blauberg
Blauberg Turbo Mixed Flow Inline AC Exhaust Fan - 315MM (12" Inch) | 2 Speed
Air Flow 2050 M³/H | Power Consumption 315W | IPX4
Blauberg
Blauberg Turbo Mixed Flow Inline AC Exhaust Fan - 125MM (5" Inch) | 2 Speed
Air Flow 230-345 M3/H | Power 25-29W | IPX4
Fantech
Fantech Minitube Duct Mounted Axial Fan 350MM (14" Inch) - MTS356 | 6 Pole | Steel Housing
Power Consumption 110W | IP44
Fantech
Fantech Minitube Duct Mounted Axial Fan 350MM (14" Inch) - MTS354 | 4 Pole | Steel Housing
Power Consumption 140W | IP44
Measure your room (Length × Width × Height) to get the volume, then multiply by the air changes per hour (ACH) you need: Airflow (m³/h) = Room volume × ACH. Bathrooms usually need 10–20 ACH, laundries and kitchens 15–30 ACH, and grow tents even higher.
Air exchange (air changes per hour) is how many times the full room volume is replaced each hour. It’s critical for removing steam, smells and humidity, and for preventing mould and condensation.
AC fans use a traditional AC motor, are cheaper and simple to run. EC fans use a high-efficiency brushless EC motor with electronics, are quieter, more efficient, and allow much finer speed control.
Use only controllers made for AC motors, such as step/transformer controllers, specific AC speed controllers, or the built-in 2-speed function (if provided). The wrong controller can cause noise, poor performance or motor damage.
EC fans are best paired with 0–10V, PWM or dedicated EC/smart controllers. These give smooth, stepless speed control and often allow temperature, humidity or timer-based automation.
Choose AC if you want a budget-friendly fan with simple on/off or 2-speed control. Choose EC if you want top efficiency, quiet operation and precise or smart control, especially for 24/7 or climate-critical applications.
Yes. Long duct runs, tight bends, small duct sizes and filters all reduce airflow. Match the duct size to the fan, keep runs as short and straight as possible, and minimise sharp bends.
Yes, a correctly sized inline fan can exhaust from two or more rooms using junctions (Y/T pieces). Ensure the total room volume and required ACH match the fan capacity, and use dampers to balance airflow.
Most inline fans sit in the roof space or ceiling void, connected to an intake grille inside and ducted to an external vent. The air should always be discharged outside, not into the roof cavity.
Look for insulated or mixed-flow models, check the dBA noise rating, and consider an EC fan so you can run it at lower speeds. Using flexible connectors and anti-vibration mounts also helps reduce noise.