AC InfinityCLOUDLINE PRO T4, Quiet 100mm Inline Duct Fan with Temperature Humidity VPD Controller, WiFi Integrated App Control Ventilation Exhaust Fan for Heating Cooling Grow Tent Hydroponic 4-Inch

Excellent quiet, very quiet fan. Lovely bit of kit. But it's controller can be very dodgy and common problems with the humidity and temp controller run together, of it turning extract off if humidity low, both fans in fact, or start stopping, etc. So they released, hey presto, and NEW Fan Controller, because this one is pants. Get the S4 instead and an S6, or 2 s6Cloudlines if you have the room, and buy the new smart controller. Sorry I got the T4 but i needed a silent fan, so just run it dumb. There were no S4s as theyre as rare as rocking horse poo poo.

For me the ac infinity fans were a game changer, got my environment dialled in just how I need it and with ease to, I purchased an s6 and a t4 reasonably priced I might add, they work perfectly together! These fans are great quality and I was even more pleased when they already came with a connector attached to a U.K. plug!Overall 10 out of 10 for these fans, hats off to AC infinity, they’re so quiet and just a quality product, I will never use another make again, if you’re thinking about buying one just do it, you will not be disappointed

Had heard a lot about these, and was almost tempted to import one from the US, so was pleasantly surprised when one popped up for sale in the UK.I kept my expectations in check, how silent can a duct fan be right?After a couple of weeks of use I'm happy to say I'm extremely impressed. It basically works exactly how I had hoped. The build quality is excellent, the packaging is excellent, and most importantly, the performance is there. At a setting of 2-3, which is all that's needed in a small environment, you can barely tell its on at all, which is just amazing. At higher settings you'll hear it but it's still very reasonable. I didn't expect to use the auto features on the controller that much but it's actually really nice for keeping the environment just where you want it.Overall can't recommend enough, acinfinity should definitely get more of these available in Europe as they are more than worth it.

Quiet, powerful, easy to setup, sensitive and responsive controls, lightweight. Very happy with this. Fast delivery. Just one tiny suggestion - if it could work via an app even better. Would highly recommend.

Runs super quiet that's all I wanted from it

Great piece of kit. Extremely easy to assemble and work out how to use the controller. UK plug already attached. Runs extremely silent on the first few settings. Maybe a little pricey but you get what you pay for

This machine is amazing it changed an environment and software and controls are easy to use ,dont buy anything else but this it really is worth the extra money and is so quiet and spend the extra for the probe and monitor it is worth it

After a week was finally ready to get this set up. Immediately disappointed as the plug was US so unusable without buying additional adapter.In the process of returning...really frustrating as ordered other items for it as well including carbon filter and straps.