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Vanguard In-line Extractor Fan 100mm for Indoor Growing
The Vanguard In-line Extractor Fan 100mm is a compact duct fan that keeps air moving through your indoor garden, pulling out stale, humid air and drawing in fresh replacement. At 100mm diameter, it slots into standard ducting without any fuss — and the motor runs quietly enough that you won't hear it through a closed door. If your grow space needs basic ventilation without eating into your budget, this is where you start.
Specifications for the Vanguard 100mm Inline Fan
The Vanguard In-line Extractor 100 fits standard 100mm (4-inch) ducting — the most common size for small to mid-sized tents and grow cabinets. Here are the key numbers you need.
| Spec | Value |
|---|---|
| Duct diameter | 100mm (4 inch) |
| Brand | Vanguard Hydroponics |
| Function | Intake or exhaust (reversible airflow direction) |
| Motor type | Quiet-running AC motor |
| Installation | Inline — mounts directly inside ducting |
| SKU | GS0014 |
Why Your Grow Space Needs an Inline Extractor Fan
Stale air is one of the fastest ways to wreck an otherwise solid indoor grow. Without proper extraction, humidity builds up around your canopy, temperatures creep past 28°C, and CO2 levels drop below the 400ppm your plants need for photosynthesis. The result? Slow growth, stretchy stems, and — worst case — mould spreading through your crop overnight.
We've seen growers lose entire harvests to botrytis (bud rot) that started because they skipped ventilation or relied on a desk fan pointed at the tent opening. A desk fan moves air around. An inline extractor fan actually replaces it — pulling warm, humid air out through ducting while fresh air gets drawn in through passive intake vents. That exchange is what keeps leaf surface temperatures down, humidity in the 50–60% sweet spot during vegetative growth, and CO2 replenished from the room outside.
The Vanguard 100mm is sized for smaller setups: think 60x60 or 80x80 tents, single-plant cabinets, or propagation areas. It won't move enough air for a 120x120 flower room — for that, you'd want a 125mm or 150mm fan. But for compact spaces, the 100mm diameter hits the mark without overkill. And because the motor is designed for low noise, you can run it 24 hours without it becoming the background soundtrack to your flat.
How to Install the Vanguard 100mm Inline Extractor Fan
Installation takes about 10 minutes with no special tools. The fan mounts directly inside 100mm aluminium or PVC ducting — no brackets, no wall mounts needed.
- Decide whether you're using the fan for exhaust (pulling air out of the tent) or intake (pushing air in). For most growers, exhaust is the priority — mount it at the top of your tent where hot air collects.
- Slide one end of your 100mm ducting over the fan's outlet port. Secure with a jubilee clip or duct tape — jubilee clips hold better long-term.
- Connect the other end of the ducting to your tent's duct port or route it to a window, chimney, or carbon filter.
- Attach ducting to the fan's inlet side and connect it to a second tent port or leave it open to draw room air.
- Plug in and check airflow direction. Hold a tissue near the intake — it should pull toward the fan. If you've got it backwards, simply flip the fan around inside the ducting.
- If you're running a carbon filter for odour control, mount the filter inside the tent and connect it directly to the fan's intake side. The fan pulls air through the carbon, then pushes it out through the exhaust ducting.
100mm vs 125mm vs 150mm Inline Fans — Quick Comparison
Choosing the right fan size comes down to tent volume.
| Fan Diameter | Best Tent Size | Typical Airflow | Noise Level |
|---|---|---|---|
| 100mm (this fan) | 60x60 to 80x80 cm | ~100–190 m³/h | Low |
| 125mm | 80x80 to 100x100 cm | ~190–300 m³/h | Medium |
| 150mm | 100x100 to 120x120 cm | ~300–450 m³/h | Medium-High |
The rule of thumb: you want to replace the total air volume of your tent at least once every 3 minutes. A 60x60x160 tent holds roughly 0.58 m³ of air — so even a modest 100mm fan cycling 100 m³/h replaces that volume many times over. The real bottleneck is ducting length, bends, and carbon filters, all of which reduce effective airflow by 20–30%. Factor that in and the 100mm fan still handles small tents comfortably.
Complete your ventilation setup with a 100mm carbon filter for odour control, aluminium ducting, and jubilee clips. If you're building out a full grow tent, pair this extractor with one of our complete grow tent kits — they include lighting, pots, and growing medium so you can focus on the plants instead of the shopping list. A clip-on oscillating fan inside the tent adds air circulation at canopy level, working alongside the extractor to prevent dead spots.
Frequently Asked Questions
How does an inline extractor fan work?
The fan sits inside your ducting and spins to create negative pressure, pulling air from one end and pushing it out the other. Mount it in your tent's exhaust duct and it draws warm, stale air out while fresh air gets pulled in through passive intake vents. Simple physics — no moving parts outside the fan itself.
Can I use the Vanguard 100mm fan for both intake and exhaust?
Yes. The fan works in either direction — just orient it inside the ducting so airflow goes the way you need. Most growers use it for exhaust (pulling air out of the tent) and rely on passive intake flaps for fresh air coming in. If your tent has no passive vents, a second fan on intake can help.
Is the Vanguard 100mm fan quiet enough for a bedroom grow?
It's one of the quieter 100mm options we carry. You'll hear a low hum if you're standing next to it, but through a closed door it's barely noticeable. Vibration noise is more common than motor noise — mounting the fan with ducting rather than hard-fixing it to a surface helps absorb vibrations.
Do I need a carbon filter with this extractor fan?
If odour is a concern, yes. The extractor moves air — it doesn't clean it. A 100mm carbon filter attached to the fan's intake side scrubs the air before it exits. Without one, whatever your plants smell like goes straight out the ducting.
What size grow tent can a 100mm inline fan handle?
Tents up to about 80x80x160 cm work well. That's roughly 1 m³ of air volume. The fan replaces that volume many times per hour, even accounting for 20–30% airflow loss from ducting bends and carbon filters. For anything larger than 100x100, step up to a 125mm fan.
Can I control the speed of this fan?
Not out of the box — there's no built-in speed controller. Pick up a separate fan speed controller (sometimes called a fan dimmer) to dial it down during lights-off or early vegetative stages when you don't need full extraction power.
How often should I replace an inline extractor fan?
A well-maintained fan lasts 3–5 years of continuous use. Keep the blades free of dust buildup — a quick wipe every few months keeps it running efficiently. If it starts making grinding or rattling noises, the bearings are going and it's time for a replacement.
Last updated: April 2026
