The Hurricane Clip Fan is perfect for above-canopy circulation in a weed grow tent.
Here are the fans you’ll need for your grow tent:
Ventilation fans
Exhaust fan: 4″, 6″, or 8″ inline fan with carbon filter
Intake fan (advised for grow tents 4×4 foot or larger)
Circulation fans
Above canopy clip-on fan
Below canopy fan
Ventilation fans
Exhaust fans
An inline fan with a fan controller lets you dial in the proper ventilation rate. Aim to exchange the air in the tent once per minute. For example, if your tent is 4x4x7, you’ll need to exchange 112 cubic feet of air. To work properly try to minimize duct length and avoid lots of sharp turns, which reduce efficiency.
You’ll need small inline fans to ensure adequate air intake in your grow tent. In smaller tents, passive air intake may suffice using the tent’s ventilation panels. But this gets tough during flowering, when you need to seal those panels to make things light-proof.
A 4 inch duct booster fan provides sufficient power for air intake in a small or mid-size grow tent.For tents 4×4 or 5×5 use a 4″ inline duct booster fan (or a 6″ or 8″ for larger tents). Duct booster fans are noisy and less powerful — but cheaper — than full-size inline fans.
Try to fine-tune intake fans so the tent walls gently suck in. A 4″ inline fan works well for air intake when a 6″ fan is used for exhaust. Use a 6″ intake fan with an 8″ exhaust fan.
Air-cooled lighting fans
You can use a single inline exhaust fan to push air through your grow light while also exhausting air. Or you could use a separate 6 inch or 8 inch inline fan dedicated to your air cooled light fixtures, with a separate fan for ventilation.
Circulation fans should provide a steady, even breeze throughout the tent. You want leaves to lightly rustle. In smaller tents a single clip fan can do the trick. In larger tents, use clip fans above the canopy and air circulator fans below the canopy.
Above the canopy
Secret Jardin Monkey fans are useful to clip to tent poles for above canopy circulation. They’re also available with oscillation. They’re powerful, functional, but are also relatively expensive.
A cheaper option is the Hurricane 6″ clip fan, which is about the same price as the slightly less powerful 2 pack of Comfort Zone 6 inch fans. We’ve used all of these brands several times each over the years and have been satisfied with each.
Amazon Basics 7 inch air circulator fan is a powerful yet affordable way to provide under-canopy air circulation.
You can also use clip on fans in grow tents for under-canopy circulation, but they’re generally less power for the money compared to air circulator fans.
Summary
You need to have the following fans for your grow tent:
Inline fan for exhaust ventillation
Small inline fan for air intake (optional)
Fans for air circulation
Your goal is to keep a consistent environment at the proper humidity and temperature levels by using constant ventilation and air circulation to bring in fresh air while avoiding stagnant pockets of damp, stale air.
We hope you find this information useful to learn what fans you need for a grow tent. Setting up your tent properly will ensure you can create an ideal environment for growing cannabis plants.
