TerraBloom ECMF-200, Quiet 8" Inline Duct Fan with 0-100% Variable Speed Controller, Air Tight Metal Casing, Energy Efficient EC Motor. HVAC, Growing and Exhaust Applications Blower for Large Spaces

I used this to boost the HVAC to a distant room that was poorly regulated. I removed the base and mounted it between two new end plates in a 8x12 rectangular duct. Tied the power to the fan control thermostat circuit via relay so any time the HVAC was on the aux blower would be also. I really like the speed control, allowed me to get just the right bonus flow to the distant room. It comes with a digital and a potentiometer (rotary) type of controller. I used the digital one. Both retain the setting between power cycles. I have it set to 3 (of 8) and can barely hear the blower, even when right under it. It has about a ~15 foot control cable and 6 foot power cord. it also comes with a short breakout control cable if you want to make your own controller, with a tachometer signal available, which I didn't need or use. My only concern is the 140F max temperature rating of this unit, but I don't think my heater will violate it.

I am an HVAC biz owner that used the 8” fan to feed two 6” branch ducts (with an 8” intake). I turned my customer’s unusable bonus room above their garage to the coldest room in the house when it was 95 degrees outside. That was at a 75% setting. Might have to turn it down a touch! With the manual control it will always come back on if there is a power outage or you can hook it into a timer or relay control. Fan was nice and quiet and seems very well designed. I cannot account for longevity as I installed it and left. Time will tell. Fan starts out slow and Ramps up - a nice feature. I was testing it on my kitchen counter when it arrived to see how it performed. When it first came on I thought “there is no way this is 700 cfm....then it ramped up and nearly blew everything off my counter and started skating across the granite. Yeah, that’ll do!

My home office is about 5 degrees warmer then the rest of the rooms. I needed to put a booster fan in the ceiling return air vent to balance out the rooms. I placed this unit in the flexible duct located in the attic. This unit is probably overkill for my need, and an expensive option, however I required remote control and variable speed, and this was the only option I could find. The unit is solid built and quiet. There is noise, but it comes from the rushing air as it passes over the grill grate, the noise is not from the motor, that part is very quiet. It comes with plenty of mounting hareware a long cord for the on/off/control switch. I hope it can withstand staying in the attic in our florida heat, I'll post back if it has heat issues.

I bought this to use as a power fan unit to pull the exhaust from my desktop laser engraver/cutter ("K40") and force the exhaust thru a series of filters (pre-filter, carbon filters, 2x HEPA filters). The air force this fan is capable of generating is insane. I actually bought this one after comparing the other models CFM specs. This one says it has an airflow of up to 569 CFM. I have a leaf blower that is 700 CFM and the force behind that is also insane, so I wanted a fan unit that could get me as close to that as possible while also being self contained. This unit does exactly that. It is also built extremely impressively well. No rough/sharp edges at all. This is as professional as it gets. And it does exactly what I need it to with regards to pulling air thru the filters. My only issue is with regards to my design in how I implemented the fan, in that I go from the laser's exhaust at 4" diameter, thru duct vent tubing, then to a 4"-to-3" reducer into a homemade filter box, out to a 3"-to-4" inverted reducer, to a 4"-6" inverted reducer, to a 6"-to-8" inverted reducer. The reason for all of the required reducers is because there's no easy way to connect a 4" diameter to an 8" diameter. It's uncommon. So the stark bump down in diameter drastically effects the pressurization internally. The fan wants to pull the 569 CFM thru 8" diamter tubing, but I'm only giving it a narrow 3" plus a load in the form of the filters. Needless to say, I'm really pushing this fan to a limit. But it's excelling at it.

Nice fans, powerful and quiet. Pricey, but you get what you pay for.

I put a conical HEPA filter on the fan to capture dust in the air in my woodworking shop. It appears to be well made, is much more quiet than I expected, and has a variable speed switch. It doesn't appear to heat up after long periods of usage and is light enough to pick up and move around the shop (even with the large filter). It works very well, but in retrospect I would have bought a fan with more CFM because the filter is so thick it reduces the intake airflow by about 25%. Not sure what "Stretch" is as a rating factor.

Just noticed I’ve had this fan for 7 years. It’s been running 24/7 for 7 years straight. If that is not quality I don’t know is tbh.

Great fan for moving heat from my wood stove room through the attic to back of the house.

Costs more than Vivisun but this one is built far better than vivosun and very quiet . takes significant amount of time and effort to install if you are installing this in a tight ductwork so better to spend the extra $$ on good quality booster fan that you don't have to touch it again.

Our hood fan doesn't exhaust smoke very well. The Kitchen usually fills with smoke and alarm goes off every time. This fan worked awesome at removing smoke. Setup takes 30 seconds. Might add a grease filter shortly.

The speed is variable to pretty low RPM, and shuts off at the bottom end. The top speed moves a huge amount of air. The decibels are pretty low throughout the range. Quieter than a smaller different brand I bought prior.

Impressed with the fan's construction, speed control attachments and noise level.

Despite being advertised as “quiet”, this fan is EXTREMELY loud, even at low setting. Would not recommend buying.