AC Infinity Cloudline Pro S, Pro T & H4 – Quiet EC Inline Fans 4"–12"
AC Infinity Cloudline Pro S, Pro T & H4 – Quiet EC Inline Fans 4"–12"
AC Infinity Cloudline – The Fan You Forget Is Running
Most inline fans announce themselves: a drone, a rattle, a hum that settles into the background of every evening. Cloudline fans are known for the opposite. Their EC (electronically commutated) motors run quietly and efficiently, with smooth speed control and no buzzing at low speeds. A controller comes in every box. The only real decision is how clever you want it to be.
Choose Your Series
- Pro S (S4–S12): a 10-speed EC controller with memory, for precise manual control at a great price.
- Pro T (T4–T12): a smart controller that runs the fan automatically by temperature, humidity and VPD, with triggers, schedules and alarms. Set your ideal climate once and let it manage itself.
- H4 (4"): built for mushroom growing. It's IP65 sealed against the constant high humidity of fruiting chambers, with a 10-speed controller to manage fresh air and CO₂.
Which Size?
| Size | Models | Airflow | Best for |
|---|---|---|---|
| 4" (100mm) | S4, T4 | 205 CFM / ~348 m³/hr | Small tents, cupboards |
| 4" (100mm) | H4 | 212 CFM / ~360 m³/hr | Mushroom fruiting chambers |
| 6" (150mm) | S6, T6 | 402 CFM / ~683 m³/hr | 1–1.2m tents |
| 8" (200mm) | S8, T8 | 807 CFM / ~1,371 m³/hr | 1.2–1.5m tents |
| 10" (250mm) | S10, T10 | 1,201 CFM / ~2,040 m³/hr | Large tents and rooms |
| 12" (315mm) | S12, T12 | 1,604 CFM / ~2,725 m³/hr | Grow rooms |
Perfect For
- Grow tents and rooms in bedrooms and flats, where quiet matters
- Mushroom growers: the H4 is purpose-built for fruiting chambers
- Plant rooms and propagation spaces needing steady, automatic air exchange
- Growers wanting data-led climate automation (Pro T)
Build the System
Pair your fan with an AC Infinity carbon filter in the same size (the flanges match exactly), plus AC Infinity ducting, a duct silencer and a noise reduction clamp for near-silent extraction. Prefer something simpler? See Cloudline Lite.
🌿 Rose's Pro-Tip: with a Pro T, set a humidity trigger as well as a temperature one. Most tent problems, from mould to slow growth, start with humidity rather than heat.
Black Flag Horticulture Ltd, Coventry – genuine AC Infinity stockists.