AC Infinity CLOUDLINE LITE B4, Quiet 4” Inline Duct Fan with Temperature Controller - Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics

There is nothing I do not like about this fan. The speed setting aspect along with temp monitoring is great. The fan is super quiet quit at speeds below 7 which is great as it gives enough negative air pressure for my tent. All of the automated settings make it worth the money.If this fan continues to work for more than 6 months I will be purchasing the next model up.

I've bought 4 different exhaust fans and ac infinity is THE BEST

The media could not be loaded.  I don't give everything a swooning review; if something is mediocre I don't hesitate to say so, but this unit gets five stars without breaking a sweat! Turns out this is part of the "economy" line of a manufacturer specializing in equipment for indoor growing. Their aim was to cut costs to bring their products within the means of people on a lower budget without sacrificing essential features, and I'm pretty sure they have done just that.Home run, guys!You will receive the inline fan, an integral digital controller and a temperature probe, as well as a small glossy instruction manual and some ancillary parts for mounting: the fan plugs into a standard outlet, the controller plugs into the fan, and the probe plugs into the controller... Now all you have to do is mount it and program it. If you are old enough to remember programming VCR's or digital watches the "programming" is of that kind, involving a series of button presses in the right order to configure things: it's not rocket science, but you will likely need the manual and you will likely get confused at least once or twice by the interaction of the various adjustments; if you don't take account of all of them you may find the fan mysteriously turning on when you believe it should be off.The fan has ten speeds and you have the following controller settings: an off speed (you can consider it an idle speed) which will be the minimum speed or "off" in automatic configurations, an on speed (or maximum speed) which will be the "on" in said configurations, an optional transition increment, which will be the temperature interval over which the controller ramps up one step from the "off" speed to the "on" speed until the maximum is reached.(a typical controller behavior--though you may not have thought about it--like you car air conditioner, which blows harder the farther off-setpoint the temperature goes). You also have timer and time-interval modes, which I did not explore.In the short video I start with the setpoint above ambient temperature and the "off" speed set to 1 -- so the fan is idling at speed 1 even though we haven't reached the setpoint. I also set the optional temperature interval to 2 degrees... speed will ramp up by an additional unit every two degrees we go over the setpoint until we reach the maximum set speed, the "on" speed. I then lower the setpoint until it equals ambient temperature--speed increments by 1--then two degrees below ambient--speed increases another unit--until I reach the full "on" speed with the setpoint 6 degrees below ambient (in practice the setpoint will be fixed and the ambient temperature will change of course, not the way I'm doing it). Besides the video I took a photo with a coffee cup for reference: I was slightly surprised how large the fan is.Well, that's all folks: I intend to mount this in my basement for additional freeze protection in a cold distant corner: the fan and sensor go in the corner, a duct runs to a warmer area near the furnace, and I can leave the heat set a few degrees lower without worrying about pipes in that corner freezing. On top of all this controller goodness it's quiet, high build quality, and comes with a two year manufacturer's warranty, so you don't need the product protection plan! Yeah, it even has that quality new product unboxing smell: What more could you ask for?[One thing that could have been just a tad clearer in the instructions: "included Molex adaptor" and "included duct clamps" are mentioned, but you won't find them. Turns out the adaptor is only included with the "A" models, and the clamps are apparently included with the ducts, not with the fan. A minor thing, but it gave me the feeling I was going to get some freebies for a minute! This disappointment could have been avoided by a few minor edits]

This AC Infinity CLOUDLINE LITE B4, Quiet 4” Inline Duct Fan with Temperature Controller is really nice. I have a crypto mining setup that is super loud and I have build a large box to help keep the noise level down. This is mounted externally and help keep cool air flowing through the box to keep cool air in and hot air out. That said, it is really an amazing tool and I really like having the temp control feature as it help keep the fans on the miners cooler and not have to work so hard to self cool helping shave off some of the operational costs. The brand is well known for quality and I really like it. Even at full speed it does not make a lot of noise. The temp control panel is very easy to see and read.I am 100% happy with it and highly recommend it.

I don't have experience with inline duct fans but I have a lifetime of experience with fans in general. This one is well built, reasonably quiet for a fan pushing as much air as this one can, and it has a nice range of control options. I'm also not a grower, but rather someone who needs to get warm air to my rather particular laser engraver in the winter. My engraver is in an unheated part of my basement with three full height windows. The source of heat (propane stove) is on the other side of a common sheet-rocked wall. My use will be very simple: run a four inch duct through the wall at ceiling height from the warm room to the cooler room the engraver resides in. I will be running duct down the wall in the engraver room to exhaust the heat closer to the floor (from where it will rise). It's a simple application for this fan.Even though my setup is simple compared to some growing applications, everything about this fan will be useful to me: a nice blower, a temperature probe and a controller that lets me control how much heat I extract from the warm room to heat the engraver room (no need to pull any more heat than needed to get the engraver area up to 60 degrees.I have set up this fan, but haven't cut the four inch hole through the sheet-rocked wall. That comes in the next few days. But the setup on my workbench works just as I would expect it to. I like the ten speed speed range dependent on the difference between set point and measured temperature -- that will help to keep from extracting any more warm air than needed from the warm room and yet keep the temperature in the engraver room stable --kind of like what current multi-stage HVAC systems do. Setting up the controller takes some time but it's not rocket science. Another reviewer said it's like programming a VCR in olden times (or my Garmin smart watch in current times). I agree. I'm happy with this product and have every expectation it's up to providing years of controlled airflow as I need it to.