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Prima Klima 2 Speed 420-800 m³/h
The Prima Klima 2 Speed 420-800 m³/h delivers serious extraction capacity with two fixed airflow settings, controlled by an integrated switch on the housing. At 420 m³/h on low, the fan runs quietly through winter months and dark cycles. At 800 m³/h on high, it handles the thermal output of 600W HPS lamps or multi-light setups in grow spaces up to 2 m². This dual-winding motor is not compatible with external dimmers, variispeed units or any voltage-based speed controllers — each speed operates on its own dedicated motor winding at optimal efficiency. ebm-papst centrifugal motor with sealed ball bearings. Order at plantandflower.be.
Prima Klima 2 Speed 420-800 m³/h – large-format dual-speed extractor for intensive grow rooms
When a single 125 mm extractor no longer keeps pace with the heat output of large grow lights, the next step is a higher-capacity unit with a wider flange. The Prima Klima 2 Speed 420-800 m³/h provides that step-up, delivering two distinct airflow rates through a single unit. The low setting of 420 m³/h conserves energy during cooler months and dark periods, while the high setting of 800 m³/h tackles peak thermal loads during summer or under intensive lighting. Growers running smaller tents with 125 mm connections should consider the Prima Klima 2 Speed 220-360 m³/h — the same dual-speed concept in a more compact format.
Not dimmer compatible: understanding dual-winding motors
External speed controllers work by reducing voltage to a single motor winding, forcing it to spin below its design speed. This approach generates hum, reduces motor efficiency and can accelerate bearing wear over time. The PK 2 Speed takes a fundamentally different approach: it contains two separate motor windings, each engineered for its respective speed. When you select low, the motor runs on its dedicated 420 m³/h winding at full design efficiency. When you select high, the 800 m³/h winding takes over. There is no intermediate state, no voltage reduction, and no external controller involved. This is why the fan is not compatible with dimmers, variispeed controllers, or any external speed regulation. The integrated switch is the only method of speed selection. For automated temperature-responsive extraction, the Prima Klima 800 m³/h thermostat model adjusts speed automatically based on a built-in temperature probe.
Airflow calculations for large grow spaces
At 800 m³/h, this extractor handles grow rooms up to approximately 2 m² under high-intensity lighting. For a 1.2 x 1.2 x 2.0 m tent with a volume of roughly 2.88 m³, the high setting delivers over 275 complete air changes per hour before accounting for system losses. After a typical 25-30% reduction from carbon filter resistance and ducting pressure drops, effective throughput remains above 190 air changes — well within the recommended range of 60+ for HPS-lit growing environments. The low setting of 420 m³/h still provides over 100 air changes in the same space, adequate for dark cycles and moderate ambient temperatures. Match this fan with a Can-Lite 800 carbon filter for odour management at both speeds. The filter's 800 m³/h rating ensures it does not become a bottleneck even at full extraction.
Build quality and installation
The ebm-papst centrifugal motor with backward-curved impeller generates higher static pressure than axial designs, maintaining performance through carbon filters and longer duct runs. The flame-retardant polyamide housing resists impact and vibration, while sealed ball bearings ensure maintenance-free operation over years of continuous use. Connect to 163 mm aluminium ducting for rigid, airtight connections. Supplied with mounting bracket, cable and plug for immediate installation on walls or ceilings in any orientation.
Order the Prima Klima 2 Speed 420-800 m³/h from plantandflower.be with fast shipping across Belgium. Professional-grade extraction with the convenience of integrated dual-speed control.
Can I connect this 2 Speed extractor to a dimmer or variispeed controller?
No. This model uses dual motor windings switched by an integrated toggle. It is not compatible with any form of external speed regulation including dimmers, variispeed units, or AC controllers. Each winding operates at a fixed speed optimised for that airflow rate. Connecting an external controller risks damaging the motor. For automated speed regulation, choose the Prima Klima thermostat model instead.
How does the 420-800 m³/h compare to the 220-360 m³/h model?
The 420-800 m³/h model delivers roughly double the airflow through a larger flange connection. It is designed for grow spaces up to 2 m² or multi-lamp configurations, while the 220-360 m³/h model with its Ø 125 mm flange suits tents up to approximately 1 m². Both use the same dual-winding principle and are not compatible with external speed controllers.
What size carbon filter should I use with this fan at full speed?
At full speed the fan delivers 800 m³/h. A carbon filter rated at 800 m³/h or higher ensures effective filtration without restricting airflow. The Can-Lite 800 is the recommended match. At the lower speed of 420 m³/h, reduced air velocity through the filter actually improves contact time with the activated carbon, enhancing filtration performance.
When should I choose the thermostat model over the 2 Speed?
The thermostat model adjusts extraction speed automatically based on real-time temperature readings from a built-in probe. Choose it if you want hands-free climate management. The 2 Speed model requires manual switching but gives you direct control over which speed runs. Both are excellent choices — the decision comes down to whether you prefer automatic or manual operation.