Grow tent climate control is the kit that moves air, scrubs odour, tracks temperature and humidity, and feeds your plants CO2. Azarius stocks around 17 climate items for indoor growers — extraction fans, carbon filters, ducting, clip fans, thermo-hygrometers and CO2 boosters from Vanguard Hydroponics, VDL, Cyclone and CO2 Boost. Shop the lot in one place, shipping from Amsterdam since 1999.
Co2Boost
Boost Buddy (CO2 Boost)
Grow tent climate control is the kit that moves air, scrubs odour, tracks temperature and humidity, and feeds your plants CO2. Azarius stocks around 17 climate items for indoor growers — extraction fans, carbon filters, ducting, clip fans, thermo-hygrometers and CO2 boosters from Vanguard Hydroponics, VDL, Cyclone and CO2 Boost. Shop the lot in one place, shipping from Amsterdam since 1999.
Climate control inside a grow tent comes down to four jobs: pull stale air out, scrub the smell, push fresh air across the canopy, and keep an eye on the numbers. Skip any of those and you'll know about it within a week — heat stress, drooping leaves, or a neighbour knocking on the door. We carry the full chain, from 100mm inline extractors right through to passive CO2 bags you hang at canopy height.
Most first-time growers underestimate ventilation. A sealed tent without extraction hits 35°C in a few hours under LEDs. That's why every kit needs three things minimum: an extractor fan sized to your tent, a carbon filter on the intake side of the fan, and ducting to connect them. After that, you're tuning — clip fans for canopy airflow, a hygrometer to watch VPD, and CO2 enrichment if you want to push yields.
The rule of thumb: your extractor should cycle the full tent volume every 1–3 minutes. Calculate cubic metres (length × width × height in metres), multiply by 60, and that's your minimum m³/h target. Add roughly 25% extra capacity to compensate for the carbon filter's airflow restriction.
| Tent size | Tent volume | Recommended fan | Filter pairing |
|---|---|---|---|
| 60×60×140 cm | ~0.5 m³ | Vanguard 100mm In-line | Falcon 100/200mm |
| 80×80×160 cm | ~1.0 m³ | Extractor Fan TT 100mm | Falcon 100/200mm |
| 100×100×180 cm | ~1.8 m³ | Extractor Fan TT 125mm | Falcon 125/300mm |
| 120×120×200 cm | ~2.9 m³ | Extractor Fan TT 125mm (high) | Falcon 125/300mm |
Beginner setup (60×60 or 80×80 tent): get the Vanguard In-line Extractor Fan 100mm, a Falcon 100/200mm carbon filter, five metres of VDL Aluconnect 102mm ducting, and one Cyclone 15W clip fan for canopy circulation. Add the Vanguard Digital Hygrotemp so you can actually see what's happening at plant level. That's a working climate setup for under what most growers expect.
Intermediate (100×100): step up to the Extractor Fan TT 125mm — the twin-speed switch is what makes this fan worth it, drop to low at lights-off and the noise disappears. Pair with the Falcon 125/300mm filter and VDL 127mm ducting. Swap the fixed clip fan for the Cyclone 20W oscillating version so you're not blasting one spot.
Advanced (sealed room, pushing yields): add CO2 enrichment. The Boost Buddy is the simplest — hang it, forget it, lasts up to 6 months and covers small tents with no electricity. For bigger spaces the CO2 Box pushes levels up to 1500 ppm, and CO2BAG XL handles larger footprints. Keep your VDL Large Screen Thermo-Hygrometer at canopy level to track the response.
When in doubt, start with the Vanguard 100mm extractor and a Falcon filter. It's the setup we'd build first in a spare-room tent and the one that gives you the least to worry about.
Three things first-time buyers skip and regret: a thermo-hygrometer at canopy level (room temperature lies — under LEDs the canopy can be 5°C hotter), clip fans for air circulation (extraction alone doesn't move air across leaves, and stagnant air invites mould), and proper ducting clamps (cheap zip ties leak air and noise). The VDL Aluconnect holds its bend without sagging, which matters more than you'd think when you're routing through tight corners.
One honest limitation on passive CO2 (Boost Buddy, CO2 Box, CO2BAG): they work, but they only really shift the needle in sealed or near-sealed grow spaces. If your extractor runs constantly at full pelt, the CO2 vents straight out. Run extraction in cycles, or only use CO2 enrichment when extraction is on a timer.
Yes, if odour matters. Without one, everything inside the tent escapes through the duct ports and fabric seams. The Falcon Carbon Filter from Vanguard Hydroponics uses Australian virgin activated carbon and pairs with the 100mm or 125mm Vanguard inline fan to scrub air before it exits.
A 100mm inline fan moving 180–250 m³/h is enough for an 80×80×160 tent. The Vanguard In-line Extractor Fan 100mm or the Extractor Fan TT 100mm both handle this size. Step up to 125mm only if you're running a 100×100 or larger, or stacking a long ducting run.
Passive CO2 products like the Boost Buddy, CO2 Box and CO2BAG use a biological process — organic ingredients or mycelium release carbon dioxide gradually over weeks or months. You hang them at canopy height and they feed CO2 down onto the plants. Best used in sealed or low-extraction setups.
Extraction moves air in and out of the tent; clip fans move air across leaves. Stagnant air inside the canopy traps humidity and invites mould. The Cyclone 15W clamps to tent poles and pushes a steady breeze; the 20W oscillating version sweeps 180° for larger canopies.
At canopy level, not on the tent floor. Temperature and humidity at leaf height are what the plants actually experience, and they can differ by several degrees from the floor. The Vanguard Digital Hygrotemp uses a probe sensor so you can hang the display outside the tent and log min/max readings.
Last updated: April 2026
