CLOUDLINE S4, Quiet 100mm Inline Duct Fan with Speed Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics, 4-Inch

Quality product. Does the job it's meant to very nicely

I replaced a built in fan in my kitchen extractor unit (failed motor) by mounting this unit in-line in the extract duct. The remote lead was long enough for me to mount the remote in my old unit and yet have the fan mounted well away. I mounted the fan on wires thus reducing any transmitted running noise (I would not expect much anyway as such a smooth running motor). The level of extraction is variable and perfect for the application. Excellent product 10/10. Fully recommend.

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

Works well

I really like this unit, it's powerful, it's quiet and the noisiest bit is the airflow. I am using it to blow air into a portable generator enclosure and the first thing I learnt was to make sure it has a good plenum to draw. I also found it works better if the outlet is not too close to a bend or obstruction or the back pressure affects it. But all of that is good HVAC design practice and for the money its very powerful if you wind it up.

This thing is just stupid, you really don't understand how good it is until you get it. It's gonna BLOW YOUR MIND if you are using a general brand extractor... the power is totally unmatched, it's fairly quiet and it's got a wee controller to set the speed of the fan which works VERY well. All in all, i don't know why I didn't buy this years ago - do it, do it, do it!! You will NEVER regret it!

Best I've seen for less than a ton.

Overall it is a great bit of technology, the smart features are invaluable. It is definitely NOT silent though. Past the 4th setting it begins being very noticeably "there" the higher you go (5-6-7-8-9-10) the louder it gets, until it just sounds like a jet engine. Make sure you don't have things laying around while you're testing it as it literally acts like a vacuum cleaner, will suck in your kid and your cat. Only buy this if it wont ever be running past 5th setting if you want quiet. Will work for small 4x4-5x5 spaces excellently. Another complaint is that on the pictures it is advertised with the controller 69, whereas I received the controller 67. The pictures are missleading.