Clip-on Fans

Clip-on fans clamp straight onto a tent pole and move air around inside the canopy. They are not extraction – they do not remove heat from the room – but they solve a set of problems that extraction alone cannot.

What internal air movement actually does

• Breaks up microclimates. Still air sits in pockets. A humid pocket in a dense canopy at lights-off is where bud rot starts.
• Strengthens stems. Plants respond to movement by thickening. Indoor plants with no air movement grow tall and weak and then fall over under the weight of their own flowers.
• Keeps CO2 available. A leaf in still air depletes the CO2 immediately around it and photosynthesis slows. Gentle movement refreshes it.
• Evens temperature. Stops the hot layer sitting under the light while the floor stays cold.

Getting it right

• Never point it straight at the plants. You want leaves gently rippling, not thrashing. Constant direct blast causes windburn – clawed, taco-shaped leaves people usually misdiagnose as nutrient burn.
• Aim at a wall or across the canopy so the air circulates rather than hitting one plant.
• One below the canopy, one above is the usual setup in a 1.2m tent. Below moves air through the lower leaves where humidity gathers; above keeps the hot layer moving.
• Oscillating beats fixed – the movement is more even and no single plant takes it constantly.
• Run them constantly, lights on and lights off. Lights-off is when humidity spikes and rot takes hold.

How many

One in a 60 x 60cm tent, two in a 1.2m, three or four in a 2.4m. They draw very little power, so this is a cheap area to be generous in. For bigger spaces see wall fans, pedestal fans and floor fans.

Not a substitute for extraction

Clip fans move air; they do not remove heat or smell. You still need extraction and a carbon filter.

Why buy from The Hydro Bros?

We are a hydroponics shop in Croydon and we run these in every tent we own. Discreet UK and European delivery, and excellent customer reviews on Trustpilot.