HYDROFARM ACDF8 Active Air 720 CFM Inline Fan, 8-Inch

I just purchased this fan as a replacement for a Vivosun that failed after 30 days; I am extremely pleased with this unit. I installed the fan as an in-line booster for my central heat, as my rear bedrooms had extremely low airflow as compared to the rest of the house.Very solid metal construction, including the blade. I didn't think much of this when shopping originally until the Vivosun with a plastic blade failed entirely--the plastic blade actually just tore itself apart from the driveshaft, apparently over a period of about a month. Looking at the design of the Hydrofarm, that should not be possible and I am counting on a long lifespan.The Vivosun actually had better specs when it came to CFM and decibel level, but I will say unequivocally that this fan moves more air and is significantly quieter.One minor point--This fan is apparently intended to feed directly into a duct and is not really an inline design. The exhaust is fluted to match with a standard 8" duct, but the intake is very shallow. I had no problem installing this as an in-line duct fan, but it did take a little extra tape and patience to get the intake duct securely mounted to the fan housing. Again, not a huge deal.I'll see how this holds up but my first impressions are very favorable.UPDATE: Nearly three years later, this thing is running as beautifully as the day I installed it. I have had absolutely no issues after heavy daily use pushing hot air from my furnace into the air ducts. Highly recommended.

UPDATE 7/25/22: 4 Years and still going quiet and strong! I highly recommend this unit over taking a chance on something less expensive.---------------This is a very solidly built fan at a great price.I purchased this fan to improve airflow into a room in my two-story 1901 farmhouse. The original ducting to the upstairs was adequate, save for a restriction to a bedroom that overheats in the summer. Although the ducting to the deficient room is only 7", installing this fan with the necessary 8x7" expander and reducer has done the trick to balance things out. On high speed it will pull all available flow from the other two 7" duct registers off of a 10" main duct. Setting the separately purchased speed controller to medium however seems to provide the perfect balance, cutting airflow to the other registers by about half, and more than doubling airflow to the deficient one.This fan is extremely quiet for the airflow it provides, and 10 feet back from the register, it is completely inaudible inside the house aside from the slight increase in air noise at the register. There is no motor hum or whine, and as others have stated, the balance is as good as it gets with bearings that will let it free spin very easily.The mounting brackets are stamped aluminum sheet and very solid with the option to mount inline or perpendicular to the direction of flow.Complaints over inlet ducting attachment are not warranted, as this is NOT designed to be used to connect inline with flexible ducting directly. It moves enough air that potential restrictions upstream of the fan could be a risk for collapsing flexible ducting. You can do it, but it could create problems that you should be aware of. Ideally, rigid ducting should be attached at the inlet with self-tapping sheet metal screws and sealed with HVAC rated duct sealing tape.I would absolutely recommend this fan, along with the Hydrofarm speed controller, to anybody considering an inline booster.I have mine setup on a SmartThings controlled outlet with triggers dependent upon both my Ecobee 4 thermostat, whole house fan, and window/door open states.

This fan is awesome! I use it to remove the heat from my garden lights (12 of them). I run it into a 20 foot 8 inch that has 4 lines coming off of it. (6 inch) 3 1k lights on each line and 4 lines. It works incredibly well. I have one pushing the air and one pulling it from another 8inch VenTech. So I have one pushing at the beginning and one pulling at the end. You may not need 2 of them but I wan't taking any chances. Nothing else comes close. My room stays nice. I am sure they would work well as a scent remover too but I use them to move air. You wont be disappointed. My only caveat? They could have used a box that fit the item better. The plastic electronics housing was sticking out of the box when it arrived. This is an oversight at the manufacturing site and this time was a non issue. It's a little bit louder than others so if sound is an issue build a box for it.

This is an excellent little blower. I used it to overcome some static pressure drop in my supply air ductwork and did the job very well. This is not a silent running fan but it's not loud by any stretch of the imagination. I have it down in my unfinished basement mounted with vibration isolators and there is only a faint hum. With the supply and return side of the fan ducted, there is virtually no air movement noise. This fan may be able to produce somewhere in the ballpark of 0.5 inches of static pressure. You'll have to get creative with your control of the fan but the equipment itself performs very well. I'm quite happy with it thus far.

Excellent product. Well built. Moves a lot of air. Quiet. My only concern is for being an in-line fan there is only a good lip to attach the pipe to on the one side. On the other there is no room to screw the duct on without hitting the squirrel cage, so we taped it on. Should have had more of a lip like the one side has. Other than that, great product.

Excellent build quality, terrific bearings. I was alarmed by the sound when first testing it, sounded like an aircraft! As soon as the vent hose was attached and filter to the other end it was quiet. Temperature in the greenhouse dropped dramatically, moves loads of air fast. Highly recommended!

strong and quiet great bang for the price love it

Good price ...It sucks....good...

Great