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Prima Klima 2 Speed 220-360 m³/h
The Prima Klima PK125-2 delivers two fixed airflow rates — 220 m³/h and 360 m³/h — selected via an integrated switch on the housing. This dual-winding motor design means no external speed controller is required, and the fan is explicitly not compatible with dimmers, variispeed units or any external voltage regulators. Each speed operates at its own optimal motor point, eliminating the hum and efficiency loss common with electronically throttled single-speed fans. Low speed for winter and nighttime cycles, high speed for summer and intensive lighting periods. ebm-papst centrifugal motor, sealed ball bearings, polyamide housing. Available at plantandflower.be.
Prima Klima PK125-2 dual-speed extractor – 220/360 m³/h with integrated switching
The question of whether to run an extractor at full power year-round or invest in speed control comes up in every serious grow setup. The Prima Klima PK125-2 offers a third approach: two fixed speeds built into a single unit, switchable via an integrated toggle without any external accessories. At 220 m³/h on low and 360 m³/h on high, it covers a meaningful range of extraction needs through a Ø 125 mm connection. Growers who prefer a single fixed speed with external controller compatibility should consider the Prima Klima 1-speed range instead — the 2-speed models are not designed for external regulation.
Dual-winding architecture: not a dimmed single-speed
The PK125-2 contains two separate motor windings, each calibrated for its respective speed. This is fundamentally different from a single-speed fan throttled by an external voltage regulator. When a standard AC controller reduces voltage to slow a single-winding motor, the motor operates below its design point — often producing audible hum, reduced efficiency, and in some cases accelerated bearing wear. The PK125-2's dual-winding design avoids all of these issues. Each speed runs at its intended operating point with optimised torque and minimal noise. The trade-off is clear: this fan is not compatible with external dimmers, variispeed controllers, or any form of electronic speed regulation. The integrated switch is the only method of speed selection. For growers who need automated temperature-based regulation, the Prima Klima 400 m³/h thermostat model provides that functionality.
Seasonal and day/night application strategy
The practical value of two speeds maps directly onto the two major variables in grow room climate management: seasonal temperature shifts and light cycle transitions. During winter months, ambient temperatures are lower and the heat load from lighting is the primary thermal contributor. The 220 m³/h setting maintains adequate air exchange without overcooling the space or wasting energy. When summer arrives and ambient temperatures rise, switching to 360 m³/h provides the additional extraction capacity needed to prevent heat stress. The same logic applies to day/night cycles — full speed while lights are on, low speed during dark periods when heat generation drops significantly. Pair the PK125-2 with a Can-Lite 425 carbon filter rated above the fan's maximum output for optimal odour control at both speeds.
- Airflow: 220 m³/h (low) / 360 m³/h (high) — integrated switch, no external controller.
- Flange: Ø 125 mm, compatible with standard ducting and carbon filters.
- Power: 63W at 230V, 50/60 Hz, 0.29A.
- Motor: ebm-papst centrifugal, backward-curved impeller, sealed ball bearings.
- Construction: flame-retardant polyamide, 244 x 220 mm, 2.28 kg. Supplied with bracket, cable, plug.
Connect to 127 mm aluminium ducting for rigid, airtight connections throughout your ventilation circuit.
Order the Prima Klima PK125-2 from plantandflower.be with fast shipping across Belgium. Two speeds, zero accessories, reliable extraction through every season.
Can I connect the PK125-2 to an external speed controller or dimmer?
No. The PK125-2 uses dual motor windings switched by an integrated toggle. It is not compatible with external dimmers, variispeed controllers, or any form of electronic speed regulation. Connecting a voltage controller could damage the motor windings. For external speed control compatibility, choose the Prima Klima 1-speed model instead.
Why does the PK125-2 use dual windings instead of a standard motor with a controller?
Dual windings allow each speed to operate at its designed motor point with optimal torque and efficiency. A single-speed motor throttled by voltage reduction runs below its design parameters, often producing audible hum and reduced airflow efficiency. The trade-off is fixed speed options rather than infinitely variable control, but the noise and performance benefits at each setting are measurable.
What carbon filter should I pair with the PK125-2 at full speed?
At full speed the PK125-2 delivers 360 m³/h. A carbon filter rated at 400-425 m³/h with a Ø 125 mm connection is the correct match. The Can-Lite 425 provides adequate capacity to filter effectively without restricting the fan's output. The filter works at both speeds — at 220 m³/h the lower air velocity actually improves filtration contact time.
How does the PK125-2 compare to the thermostat-controlled Prima Klima model?
The PK125-2 offers manual two-speed switching via the integrated toggle. The thermostat model automatically adjusts speed based on a temperature probe, providing hands-free climate management. Choose the 2-speed if you prefer manual control with two distinct settings. Choose the thermostat model if you want automated regulation that responds to real-time temperature changes without intervention.
