6" Inline Duct Fan, 400 CFM

I am glad that I bought this fan. I was worried that for the low price it would be junk, but it is not. The housing is good quality and it moves a lot of air. No problems with it yet.Compared to some of the 6" sunleaves wind tunnel fans I have this is all most just as nice. The hydrofarm fan is wired externally, is a little less bulky and is a little quieter than a wind tunnel. It has very basic mounting brackets compared to the wind tunnel. The wind tunnel also comes with rubber washers for quieter operation when you mount it to a wall or the ceiling. In my opinion I felt the washers do not help with noise coming through the floor. I now hang all my fans with bungee cords and have no noise coming through the floor. In my case the mounting brackets are pointless and I do not use them.If this fan lasts, it is a great buy. I found this fan at almost half the price as the 6" wind tunnel. It has performed equally with the wind tunnel and I like the design better. The external wiring could be a pro or con. If it was wired internally it would be perfect for me, but it also leaves an easy option for direct wiring to anyone who may want that.

Great fan, very powerful and not overly loud when used with a fan controller. I use a VenTech controller with it and it is a beautiful match. Good quality, heavy wiring with an extra long cord. Quite a compact size which is nice. The green coating feels great and durable like a powder coat almost. The mounting brackets can be mounted either parallel or perpendicular to the fan which makes mounting the fan very easy. I have mine hanging with bungees and there are no vibrations. Seems very well balanced. I sleep in the same room as this fan. Moves a ton of air at any speed and it is quieter and smaller than the other inline fans that I have. I would recommend and I would purchase again.

Package showed up quickly. I mounted it in the atic, (make sure you hang it by strings instead of solid mounting) quieter this way. Ran my 6" ducting down into my grow space, connceted it to my air cooled light and then to my carbon filter. It creates a negative air flow sucking out all the heat and the stink. Couldnt be happier! i cant even hear it...grow closet space is 4'X6'X8 and it handles the air flow no problem at all. Oh and I boought the speed controller (SE Electronic Stepless Speed Controller) to go with it. I put it on the low setting and circulates the air nicely with a small fan in the room. It also helps to keep the noise down.Honestly I can stand right out side my grow room and I have to listen really hard...but even still barly any noise at all.If your thinking on the 200CFM, dont...you'll need the extra power to pull through all of your stuff. better to get the 400 and step it down to speed with the controller.hope this helps!

The Active Air 6-inch inline fan is extremely well built, but quite difficult to use as a heat duct booster. If you just want to move a lot of air through a 6-inch duct, it will do the job extremely well. But as part of a furnace heating system solution, it will require a lot more than what's in the box. That is the only reason I will not give it five stars.First it comes with no means to make it turn on with the furnace blower. It would be idiotic (for me) to run it all the time. As an engineer, I had no problem wiring it to the high heat and neutral connections on the furnace and installing an external outlet for it to plug into; most users would not have those skills. Before doing so, I checked the maximum furnace blower demand and determined that using any furnace blower speed less than the maximum left plenty of unused amperage for the inline fan's maximum of less than one amp draw. Additionally the entire maximum furnace amperage was less than 8 amps and all the furnace control switches were rated 12 amps, so I had no concern about that issue. I just added a 3 amp inline fuse to the external outlet to protect the furnace from any idiot trying to use the outlet for something else while it is energized. If I were to have used central air conditioning, it is likely that two furnace blower speeds would have been used and I would have had to find a solution involving one or two auxiliary relays to run the fan under both powered conditions. That would be more complexity and expense, especially if I desired different speeds for the inline fan as well.Secondly, it does not come with speed control, which is an essential part of heat balancing in a furnace duct system. I also found the air turbulence noise entirely unacceptable for any bedroom, if I applied more than half voltage. The turbulence noise propagated through all of my metal heat ducts and was loudest from the shortest ducts - not the longest one in which I used the fan. I tested the fan at all voltages, using a variac (variable voltage transformer) and found it entirely free of any motor hum at all speeds. It is a high quality fan, easily controlled by variable voltage. It even has near-unity power factor correction, which shows an unusual attention to quality construction. I would recommend use of a variac for anyone unsure of what voltage produces the air flow/air noise they need/can tolerate. So when I read reviews of people using the "wall wart" type speed controllers and hearing a motor hum, I am sure that it is because the "wart" is not producing a sinusoidal voltage and should not be used with this fan. I ended up installing two small (40 VA) 120/29 volt (labeled 120/25) transformers in the furnace blower compartment, wired in series to produce the 60 volts I ended up applying to the fan from my 123 volt service. It is possible to buy and ship a suitable transformer with at least a one amp rating and whatever voltage you want for less than $40, once you know what you need. Or just use a variac which may cost a bit less than the fan, when shipped.Installation was not easy either. The fan is heavy and had to be mounted with its "bulge" and hangers located between floor joists, because the duct was too close to the ceiling/joists. The fan's input and output diameters are larger than a male 6-inch duct, so a short female section must be added to fit a male pipe end. Then it took about three layers of duct tape to bulk it out to better fit the inside diameter of the female pipe. Screws and drilling used on the inlet need to carefully avoid the circumferential blower.A 6-inch heat duct will typically carry 85-100 cubic feet per minute (CFM). At half voltage and about 32-35 watts with transformer losses, I ended up feeling more than that typical air flow, despite the duct being more than 20 feet long and having seven elbows along its circuitous route. Before the inline fan it carried a negligible amount of air, so I am quite satisfied with the application. My distant bedroom is no longer 5-10 degrees cooler than the rest of the house. I don't see anyone wanting 400 CFM and the associated noise in their home, but the capability is probably there.

Moves a Ton of air and only have it on medium low (using the step-less speed controller) My upstairs room is about 15x15 and used to be so hot in the summer months. So far this year I have had this fan running and it has cooled the room off by at least 8 degrees from where it used to be during 90 degree days. The room used to be at about 83 degrees on a 90 degree day with the down stairs thermostat programmed at 72 degrees. Now I am sitting closer to 74 degrees in that room, and it seems to be slightly cooling down other areas of the upstairs. Note: Fan is installed in my basement and is pushing air to the 2nd story easily. Also. This fan is super quite.A few things to think about when you install.1. Install as close to the trunk line as possible2. Purchase 6 inch draw band clamps, to help with instillation.3. Research the concept of "Free Air" | The fan can "kill" other registers by robbing them of their air.