Not sure which AC Infinity equipment you need for your grow tent? This guide explains how extraction fans, carbon filters, circulation fans and smart controllers work together — and how to choose a suitable setup for different growing-space sizes.
Whether you're starting a small indoor herb garden or upgrading a larger grow room, the aim is the same: reliable airflow, manageable temperature and humidity, and equipment that works together.
Shop the AC Infinity range at GoGrow
Quick Guide: What Equipment Do You Need?
Most indoor growing spaces benefit from three basic components:
- Extraction fan: Removes warm, humid air and draws fresh replacement air into the space.
- Circulation fan: Moves air gently around plants to reduce stagnant areas.
- Environmental monitor or controller: Helps you track conditions and adjust equipment.
You may also need a carbon filter if odour control is important, and a smart controller if you want compatible equipment to respond automatically to changing conditions.
Grow Tent Sizes at a Glance
| Growing space | Starting point | Equipment to consider |
|---|---|---|
| 60 × 60 cm | Compact setup | Adjustable extraction, gentle circulation and basic monitoring |
| 80 × 80 cm | Small setup | Extraction with capacity for filter and ducting losses; circulation fan |
| 90 × 90 cm | Small–medium setup | Adjustable CLOUDLINE extraction, circulation and optional smart control |
| 120 × 60 cm | Long, narrow setup | Extraction plus circulation positioned to reach both ends |
| 120 × 120 cm | Medium setup | Extraction sized for lighting heat and restrictions; smart control worth considering |
| 150 × 150 cm | Larger setup | Higher-capacity extraction, suitable filtration and potentially multiple circulation fans |
| 240 × 120 cm | Large rectangular setup | Careful airflow planning, distributed circulation and multi-device control |
Important: These are planning suggestions, not fixed fan-size recommendations. The correct extractor depends on tent height, lighting heat, intake-air temperature, filter resistance and ducting — not just floor dimensions.
1. How an AC Infinity Ventilation System Works
Think of a grow tent as a small room that needs a continuous supply of fresh air.
An extractor removes air from the tent. Replacement air enters through intake vents or an appropriately designed intake system. A circulation fan moves air around the plants, while a controller can help regulate compatible equipment.
A typical arrangement looks like this:
Extraction system:
Carbon filter → CLOUDLINE extraction fan → Ducting leading outside the tent
Air circulation:
CLOUDRAY circulation fan → Gentle airflow around the growing area
Automated control:
Temperature/humidity sensor → UIS controller → Compatible extraction and circulation fans
The exact physical layout may vary. For example, an extractor can sometimes be mounted outside the tent, provided the system is correctly installed.
The important distinction is that extraction exchanges air, while circulation moves air already inside the space.
2. Choosing an AC Infinity CLOUDLINE Extraction Fan
AC Infinity's CLOUDLINE range uses electronically commutated (EC) motors with adjustable speed control.
That means you can vary the extraction rate rather than operating the fan at full power all the time.
CLOUDLINE S-Series: Simple Adjustable Ventilation
The S-series is a good starting point when you want reliable extraction with straightforward speed adjustment.
It suits growers who prefer to manage ventilation manually or who plan to add compatible smart controls separately.
GoGrow offers CLOUDLINE S-series models in several sizes.
Shop AC Infinity CLOUDLINE S-series fans
CLOUDLINE T-Series: Extraction With Smart Control
The T-series packages are designed for growers who want environmental automation from the outset.
Current CLOUDLINE T4 and T6 manufacturer packages include a Controller 69 PRO, which can adjust compatible equipment according to environmental settings.
Check the supplied package and model revision before purchasing, as specifications and included accessories can vary between generations.
Browse AC Infinity extraction fans and controllers
Is a Bigger Extractor Always Better?
Not necessarily.
A fan needs enough capacity to overcome the resistance of ducting and filters, but buying the largest model available is not automatically the best solution.
Consider noise, speed control, power consumption, physical size and whether the filter can handle the intended airflow.
A correctly selected fan operating at a comfortable speed is often preferable to an unsuitable fan running at its limit.
3. How to Calculate Grow Tent Ventilation Requirements
A useful starting point is the volume of your grow tent.
Step 1: Calculate the Volume
Length × Width × Height = Volume in cubic metres (m³)
For a 120 × 120 × 180 cm tent:
1.2 × 1.2 × 1.8 = 2.59 m³
Step 2: Estimate Baseline Air Exchange
A common preliminary sizing approach is to consider one complete air exchange per minute.
2.59 × 60 = approximately 156 m³/h
This is a baseline estimate, not the final required fan rating.
Step 3: Allow for Real-World Restrictions
Your system may need additional capacity because of:
- Carbon filters
- Long duct runs
- Duct bends
- High-output lighting
- Warm intake air
- Reduced fan speed for quieter operation
AC Infinity's sizing approach accounts for these factors and recommends capacity headroom above the calculated requirement.
Step 4: Check the Complete System
The fan, filter and ducting must work together.
A fan advertised at a particular airflow rating will not necessarily deliver that airflow once connected to a restrictive filter and several metres of ducting.
For a demanding installation, check the manufacturer's fan performance information and the filter's rated airflow rather than relying on tent dimensions alone.
4. Choosing Equipment for Different Grow Spaces
Small Tents: 60 × 60 cm and 80 × 80 cm
For a compact tent, focus on controllable airflow, gentle circulation and manageable noise.
Equipment to consider:
- An appropriately sized adjustable CLOUDLINE extraction fan
- Suitable ducting
- A carbon filter if odour control is needed
- A compact CLOUDRAY circulation fan
- A temperature and humidity monitor
A compact filtration kit may be convenient where its performance suits the installation.
GoGrow carries an AC Infinity 4-inch filtration kit containing an inline fan, carbon filter and ducting.
View the AC Infinity 4-inch Air Filtration Kit
Remember that the fan's unrestricted airflow rating is not the same as the airflow delivered through the complete filtration system.
Medium Tents: 90 × 90 cm and 120 × 120 cm
At this size, ventilation requirements can vary considerably depending on lighting and the surrounding room temperature.
Consider:
- Adjustable CLOUDLINE extraction
- A carbon filter rated for the intended airflow
- One or more circulation fans positioned for even air movement
- A Controller 69 PRO if you want automated environmental adjustments
For growers who want to upgrade gradually, an S-series fan with suitable control options may be attractive.
For growers who want smart control from the beginning, a T-series package is worth comparing.
Explore CLOUDLINE fans at GoGrow
Larger Tents: 150 × 150 cm and 240 × 120 cm
Larger spaces need more careful planning.
An extractor must handle the required airflow, while circulation fans need to reach the full growing area without creating excessively strong airflow directly onto plants.
Consider:
- Higher-capacity extraction selected using system requirements
- Filtration with adequate airflow capacity
- Multiple circulation fans where necessary
- A multi-device UIS controller
- Suitable duct routing to minimise unnecessary restrictions
For a large grow room, provide the tent dimensions, lighting wattage and proposed duct route before choosing the final fan and filter combination.
5. Do You Need a Carbon Filter?
A carbon filter is primarily used for odour control.
It contains activated carbon that captures many odour-causing compounds as air passes through.
A typical installation places the carbon filter before the extractor, allowing the fan to pull air through the filter and exhaust it through ducting.
How to Match a Carbon Filter to a Fan
Check three things:
Connection size: The filter, fan and ducting must be physically compatible, or use suitable fittings.
Airflow rating: The filter must be suitable for the intended operating airflow.
System resistance: The filter creates resistance that reduces the airflow delivered by the fan.
For example, AC Infinity's current standard 4-inch and 6-inch carbon filters have different maximum airflow ratings. A fan's maximum unrestricted airflow may exceed the rating of a same-diameter filter.
Matching diameters alone is not enough.
GoGrow's catalogue audit identified carbon filtration within its AC Infinity filtration kits. If you're building a system from separate components, check the available filter options across GoGrow's wider ventilation range.
6. CLOUDRAY Circulation Fans: A6, S6 and S9 Explained
CLOUDRAY fans circulate air inside the growing space.
They help prevent stagnant air pockets and can provide gentle movement around leaves.
CLOUDRAY A6
A compact clip fan with a manually adjustable direction.
Consider it when you want to direct airflow towards a particular area without automatic oscillation.
CLOUDRAY S6
A 6-inch oscillating clip fan designed for adjustable air movement around a grow tent.
It is a useful option where you want airflow distributed across more of the growing area.
CLOUDRAY S9
A larger oscillating circulation fan that may be useful in wider growing spaces.
Choose circulation equipment according to coverage and the needs of your plants rather than treating its airflow rating as extraction capacity.
Can CLOUDRAY Fans Connect to an App?
Compatible CLOUDRAY fans can be integrated with AC Infinity's UIS control system.
However, don't assume that the fan itself has independent Wi-Fi connectivity. App-based control may require a compatible UIS controller.
7. AC Infinity Smart Controllers: Which One Should You Buy?
One of AC Infinity's main advantages is the ability to connect compatible equipment through its UIS ecosystem.
A controller can use environmental readings to adjust connected devices according to programmed settings.
For example, it may increase extraction when the measured temperature rises above a chosen threshold.
Controller 69 PRO
- Four direct device connections
- Temperature and humidity monitoring
- VPD-related programming
- App connectivity and scheduling
A practical choice for a grower building a relatively simple connected setup.
Controller 69 PRO+
- Eight direct device connections
- Environmental monitoring and automation
- Suitable for more connected equipment
Worth considering when you expect to control several devices.
Controller AI+
- Eight direct UIS connections
- More advanced environmental monitoring features
- Expansion options for supported equipment
Best considered when you have a more complex system and will actually use the additional capabilities.
Compare AC Infinity controllers at GoGrow
What Is VPD?
VPD stands for vapour pressure deficit.
In simple terms, it describes the drying demand of the air around a plant. It is influenced by temperature, humidity and leaf temperature.
Monitoring VPD can provide more useful context than looking at humidity alone, but the appropriate conditions depend on the plants and their stage of growth.
You don't need to master VPD calculations before buying your first extractor fan. Start with reliable airflow and environmental monitoring, then add more advanced automation when it would be useful.
8. Three Ways to Build Your AC Infinity Setup
Option A: Essential Ventilation
For growers who want a straightforward system.
Shopping checklist:
- Adjustable inline extraction fan
- Appropriate ducting and fittings
- Carbon filter if required
- Circulation fan
- Temperature/humidity monitor
Best for: Simpler setups and customers who prefer manual control.
Option B: Smart Grow Tent Ventilation
For growers who want compatible equipment to respond automatically to changing conditions.
Shopping checklist:
- CLOUDLINE extraction fan or suitable T-series package
- Correctly matched filtration and ducting
- CLOUDRAY circulation fan
- Compatible UIS controller, if not included
- Any required cables or adapters
Best for: Growers seeking greater convenience and more consistent environmental management.
Option C: Advanced Multi-Device Climate Control
For larger growing spaces or customers managing several pieces of equipment.
Shopping checklist:
- Extraction designed for the full system requirements
- Suitable filtration
- Multiple circulation fans if needed
- Controller 69 PRO+ or AI+
- Compatible environmental accessories
- Correct UIS connections and accessories
Best for: More complex systems where coordinated control offers a clear benefit.
Build your setup from GoGrow's AC Infinity range
9. Common Mistakes When Setting Up Grow Tent Ventilation
Choosing a fan by tent width alone. Lighting heat, filters and ducting can make two similarly sized tents behave very differently.
Confusing extraction and circulation. A clip fan moves air around the tent; it doesn't replace fresh-air exchange.
Ignoring carbon filter ratings. A filter must be suitable for the intended airflow, not merely fit the fan's duct diameter.
Using long, restrictive duct runs unnecessarily. Extra bends and long ducting can reduce effective airflow.
Blowing strong air directly onto plants. Aim for appropriate, distributed movement rather than constant harsh airflow.
Assuming every UIS device is compatible without checking revisions. Older CLOUDLINE fans may use different connectors and require adapters.
Expecting extraction to cool a tent below the intake-air temperature. Ventilation can remove heat, but the temperature of the incoming air still matters.
10. Frequently Asked Questions
What Size AC Infinity Fan Do I Need for a 120 × 120 cm Grow Tent?
Start by calculating the tent volume and baseline airflow, then allow for lighting heat, filter resistance and ducting. The right choice cannot be confirmed from tent dimensions alone.
Is a 4-Inch or 6-Inch Extractor Better?
Neither is universally better. Compare the airflow your installation requires, the fan's performance under resistance, filter compatibility, noise and available duct openings.
Do I Need a Carbon Filter?
Not every indoor growing space needs one. A carbon filter is mainly useful where odour control matters.
Can I Use a CLOUDRAY Fan Instead of an Extractor?
No. CLOUDRAY fans circulate air within the space; extraction fans exchange air with the surrounding environment.
What's the Difference Between CLOUDLINE S-Series and T-Series?
The S-series focuses on adjustable extraction, while current T-series packages include smart environmental control. Check the exact model and supplied controller.
Do AC Infinity Fans Work With Controller 69 PRO?
Current UIS compatibility information supports compatible CLOUDLINE and CLOUDRAY models. Older CLOUDLINE connector types may require an adapter.
Can I Add Smart Control Later?
Potentially, yes. Check your fan's model and connector revision to confirm the correct controller and any required adapter.
Should My Extractor Run Continuously?
That depends on the plants, growing environment and ventilation design. Many setups benefit from a baseline level of air exchange, with higher extraction when temperature or humidity increases. Avoid settings that allow conditions to deteriorate between cycles.
11. Shop AC Infinity at GoGrow
A well-designed growing environment doesn't require every accessory in the catalogue. It requires the right combination of extraction, circulation, filtration and control for your space.
Start with the size of your tent, the heat produced by your lighting and your ducting arrangement. Then select compatible equipment that meets those requirements.
At GoGrow, you can explore AC Infinity fans, smart controllers, circulation equipment, grow tents and accessories.
Shop All AC Infinity Products at GoGrow
Need help choosing? Contact GoGrow with your grow tent dimensions, lighting wattage, intended carbon filter and approximate ducting length. That information makes it much easier to narrow down a suitable setup.