TerraBloom 10" Quiet EC Inline Duct Fan with Speed Controller, ECMF-250, 946 CFM, 126W, ETL, HVI and Energy Star Listed

Good quality duct fan. I've purchased two. The older has been running for over 4-1/2 years.I had a problem with one of them. A couple of months ago, I noticed one of the rooms that one of the fans services seemed to have reduced airflow. After a brief trip into the attic, I was able to determine the fan was not working correctly. It was getting power, but I heard this hum noise. From experience, I know what that means: the fan motor is jammed. Now, normally from my experience this means the fan motor bearing has gone bad. I was very disappointed and frustrated, because first of all the fan failed, and second it's a bit of a PITA to swap these out given the duct work required to be undone and redone.Nevertheless, what choice did I have? So, I ordered a new one. A few weeks later when the weather had cooled off a bit, I decided to embark on the project to replace the fan. Well, to my astonishment after opening the ductwork, I found the culprit: a piece of foam had somehow gotten dislodged from somewhere in the duct system, and this fan had sucked it into itself! I don't think the orientation of the fan would have mattered. Either way, this would have gotten stuck. There is a plastic shield on one side of the fan to try and block things like this from happening, however this piece of foam was narrow and it was just going to jam it up. Anyway, I am thrilled that the problem turned out NOT to be the Terra Bloom fan. After removing the foam and testing the fan, I patched up the ductwork again and the fan has been running like a champ ever since! I'm impressed with its quality!While I'm leaving a review, I'll mention some other points. Noise: I have one in an attic above the master bedroom. You can't hear the fan noise (you do here the increased airflow in the master though). Terra Bloom does make a silenced version of this fan, but I have not had the need for one so far. I have that fan on about 75% of max speed.From an installation perspective, these fans have a reasonable amount of room to attach flex duct. Several inches of overlap and easy to screw it on, attach a clamp or zip-tie, or both. I also have a Hurricane fan for another use case, and the latter will blow the paint off the wall, however it's rather difficult to install compared to the Terra Bloom. From a build quality perspective the Terra Bloom is one of the better plastic fans I've examined.A tip when installing: it is possible to remove the mounting plate if that's helpful for your install. I found the mounting plate to be a bit awkward for some situations, but it's not too bad. These type of fans can be either directly attached to a roof truss, ceiling joist, or a makeshift joist. They can also be hung using HVAC duct straps. They are plenty strong enough to hold these fans when secured properly. I have installed some duct fans like that before to reduce vibration, but I did not find a need to do that with the Terra Bloom fans. They do not have strong vibration issues like some fans do.From a power and cooling perspective, my 10" unit draws less than 1.5 amps @ 120VAC running @ 75% power. This is more than adequate to provide a considerable improvement in cooling my master bedroom, which is nearly the furthest point from the HVAC unit. The run is around 50 feet or so. This fan made a huge (positive) difference in comfort within that room.

We have two separate upstairs living areas, divided by attic. It's a bit of an odd situation and both areas are serviced by one a/c unit. During the winter, the area without the thermostat gets really cold, and during the summer, it gets really hot. It's nearly impossible to regulate temperature, even with a remote sensing unit on the thermostat. Worst of all, because the one area with the thermostat stays comfortable, the a/c rarely runs and the other side gets stagnant. I bought one of these inline duct fans and installed it in the side without the thermostat and it was a game changer! Even without the thermostat, it changed up the room temperatures AND kept the air circulating. I have been very pleased.Installation was easy - simply cut open the ducts and install the fan. Then, reseal the duct. I ran the speed control to an area where it could easily be accessed and there was plenty of cord to do that. Noise-wise, these fans are silent. There's very little noise and no vibration that I can detect.The only issue I had was that the side with the thermostat got less airflow than the other side as the duct fan was pulling most of the air from the a/c unit into the room. I ended up buying a second one and installed it in the duct for the other living area. This equalized airflow in both rooms and really made them both comfortable for the first time since moving in. I'm really pleased with their performance and am very happy I installed them.

So the kids room room is 40' away from the hvac unit and their room is always 5 degrees warmer than the rest of the house. Tried dampers first but didnt make much difference. So looked for options and this inline duct fan did the trick. Just had to pull back the factory flexduct from the splitter, install the fan, attached the flexduct to the fan, add a solid support and thats it. Currently running the fan at 25% speed and it moves alot of air and you can barley hear it in the rooms. I cranked it up to 100% to see what it would do and wow does this move some serious air but its loud at 100%. Plus 25% power is perfect for what I need it for. Just installed it yesterday and will update this review if anything goes wrong in the near future. Also a note* please be aware this is direct plug into a electeical socket which means it will run all the time. I went with a thermostat controller to turn the fan on and off when it detects the air temp difference. I plan on wireing up a relay so when the hvac unit turns on, it will turn this on as well.

Great fan. Used as a booster in our duct system to help distribute more air to parts of our house. This fan is very quiet and solidly built. The variable speeds makes this great for making sure the flow of air is exactly what you need. We paired this with a switch that shuts on and off based on air flow. We mounted the switch at the air handler so that when the AC or heat goes on, so does this fan. Works perfect and we are very pleased. We were given an estimate of $4800 to rearrange our air duct work and invested about $220 and completely fixed our issues.

Noisy at full speed, but can be dialed down to ZERO, if needed. Add the Thermostat/Speed control and you can set this fan to START at VERY low speed when temp gets just above 32 degrees (as in my case) and increases in speed as temp gets higher. You can even set an ALARM temp level to put it at max speed until the temp gets below that threshold. I have my system keep the fan OFF if below 32 degrees F.When the outside temp is ALSO above 32 F, I have my home automation system shut power off to the fan outlet, so fan would not need to come on, if that is what you want. When the outlet is energized, both the fan and the speed control power up to your preset settings, if you wish. I love that part.