Ventilation

Our indoor ventilation range

A single 600 W HPS bulb radiates around 400 watts of heat into your grow space. Without steady airflow, temperatures inside a 120 × 120 cm tent climb past 35 °C within the hour — enough to stall photosynthesis and invite mould. At Plant & Flower, your Belgian grow shop since 2011, you'll find every piece needed to build a reliable, quiet airflow circuit: extractors, carbon filters, circulation fans and every fitting you need.

How to size your ventilation

Extractor capacity is rated in m³/h. The rule of thumb: cycle the tent's air volume every 2 to 4 minutes. Important: attaching a carbon filter reduces effective airflow by 25 to 40% due to back-pressure. Always oversize the extractor beyond the raw volume calculation to compensate for these losses.

Recommended airflow per tent size

• 60 × 60 × 160 cm tent (0.58 m³): extractor 125-180 m³/h, Can-Lite 150 filter
• 80 × 80 × 180 cm tent (1.15 m³): extractor 180-280 m³/h, Can-Lite 300 filter
• 100 × 100 × 200 cm tent (2 m³): extractor 280-400 m³/h, Can-Lite 425 filter
• 120 × 120 × 200 cm tent (2.88 m³): extractor 400-600 m³/h, Can-Lite 600 filter
• 150 × 150 × 200 cm tent (4.5 m³): extractor 600-800 m³/h, Can-Lite 800 filter

Extractors, filters and circulation: the three pillars

Inline extraction fans such as the Ø 125 mm 185 m³/h model handle small tents on a tight budget and install in minutes. For more power or quieter operation, Prima Klima centrifugal extractors are the benchmark: the 2-Speed 220/360 m³/h drops to a whisper-quiet low setting at night without losing airflow altogether. Thermostat models adjust speed automatically based on ambient temperature — no more heat spikes needing manual intervention.

For canopy-level circulation, a Monkey Fan with ball bearings clips onto tent poles and oscillates back and forth, keeping floor space clear. As a supplement to your carbon filter, an ONA Block Pro 170 g placed in the surrounding room neutralises any residual odours escaping through micro-leaks.

Cutting noise: three combined measures

• Acoustic Sono-Connect ducting instead of bare aluminium (around 6 dB reduction)
• Flexible silencer between the extractor and the tent exit
• Speed controller to run at the minimum effective rpm
• Optional: soundproofing box around the extractor for flats

Essential accessories

An airtight circuit needs proper fittings: flanges to connect extractor and filter to the ducting, junctions to join sections, hose clamps on every connection. Don't skip a back-draft shutter between the extractor and the wall exit — it stops insects, dust and outdoor odours from flowing back into the tent when the fan is off. For grow tents running HPS lighting, heat extraction is even more critical than with LED setups.

FAQ - Frequently asked questions about ventilation

From a compact 60 × 60 tent to a full-scale grow room, we stock the components to build quiet, reliable ventilation. Browse the subcategories below or get in touch for tailored advice. Fast, discreet delivery across Belgium.