VEVOR Inline Duct Fan, 8-Inch 807 CFM with Temperature Humidity Controller, Quiet EC-Motor Ventilation Exhaust Fan for Cooling Booster, Grow Tents, Hydroponics

I purchased this 4" duct fan to be used as a ventilation fan in the attic of a second story room above a garage. I am going to be using the room as a gaming/man cave room and wanted a ventilation fan that I could adjust the speed of the fan and be unnoticeable when in the room. This fan works perfectly for the limited space I had to install it in and with the asthetically pleasing LCD controller, this fan met all criteria I had and then some. It gives accurate readings of the air temperature and humidity %. It also, of course, controls the fan speed with 10 program or manually selected speeds. On the lower speeds, the fan virtually cannot be heard which is exactly what I wanted. The higher speeds are noticably louder for obvious reasons but it really moves some air which is the whole purpose of this fan. It has been running continuously for a month now and works flawlessly. Overall, excellent choice for a variable speed duct fan with all the bells and whistles and the best part is, it's a fraction of the cost of similar type fans.

I recently added the VEVOR Inline Duct Fan to my hydroponic setup, and I’m impressed with its performance. The 4-inch fan delivers an impressive 205 CFM, providing strong airflow that keeps my grow tent well-ventilated. It runs quietly, which is essential for my indoor environment, allowing me to focus on my plants without distractions. The integrated temperature and humidity controller is a nice feature, helping me maintain optimal conditions for my plants. It’s straightforward to set up, and having this control makes a big difference in ensuring my plants thrive. However, there are a couple of areas for improvement. While the fan is powerful, I found the controller’s sensitivity could be better calibrated; sometimes, it seems to react slowly to changes in temperature and humidity. Additionally, the fan could be a bit tricky to install in tight spaces due to its design. Overall, the VEVOR Inline Duct Fan is a solid choice for anyone looking to enhance ventilation in their grow tent or hydroponic system. Just be prepared to fine-tune the controller settings for the best results!

I snagged this combo during the Prime Day deals to run on my 60w CO2 laser for smoke extraction. I had been using a 4" online fan with a step down adapter I 3d printed. It worked, but wasn't the. Greatest and certainly wasn't quiet. This usit with the control panel and sensor was a nice upgrade. Mind you, it's primarily plastic, time will tell how well it holds up, but for the price paid, it's a sound investment. I mounted it behind the laser on the cart I built for it, connected right up with the ducting (separate purchase, same brand) and ran without any problems. I was impressed with the airflow, but moreso the lack of noise. It's literally 30% quite or more than the old style in line fan I was using. I don't think it's worth what it normally runs when not on Prime Day or a lightning deal, but when it is at those prices, it's a solid purchase.

This fan blew me away. I was making a cooling system for my laptop and wanted to run a 4 inch hose trgough the desk to the underside of my laptop. I purchased a random4 inch fan that was not very good so I decided to go larger. I happened to see this fan on sale and thought it may be too good to be true. Well it is not, i was going to go 6 inches but the 8 inch was less than other 6 inch fans so I bought one. The first time I turned this fan on I actually thought my laptop would lift off the desk. I coul only laugh at the amout of overkill for my needs I got. But hey overkill can be good. The little control unit that comes with it is a little chunky when trying to navigate but i like the fact its lit up and you can read it in a dark room. Tge speeds range from 1 to 10 and each one is a clear and progressively higher step in fan speed. I put a 6 inch reducer on my since I had 6 inch ducts alreadynand it was only going two feet from being mounted on my the underside of my desk through the desk to a cistom duct holder and stand for my laptop. I use a custom filter to try and minimize the dust being pumped into the laptop vents. It works really well and i never have to turn it up past 4 and it moves a lot of air. This fan is worth every pennyand it moves so much air that I buy a second one for my den to circulate the ac cool air since i only have one vent in a very large room.. Short answer is this fan is powerful and moves a ton of air!!! You will not regret your purchase and sometimes it half the price of other less powerful fans. I paid 25 percent more than what i paid for my 4 inch fan that wont even blow a piece of paper. The fan can get louder at around the 7-10 range but i was surprised at the quietness in relation to the amout of air being passed through. Over good fan!

Excellent product and quality. It's been running almost non stop since day 1. Better instructions would be a huge help. I ordered the 750 cfm one for another project. Very happy and highly recommend

Do Not Buy - No Returns accepted !!!! Not the good product and information on the website is totally conflicting. I clearly states that it's 220V but when I got it, documentation is all 110V. Once installed, it's not very quite as described and it's guaranteed not 807 CFM, actually not even close. In addition, all the videos and review video shows there are 8 inch to 4 inch reducers on both sides, but it didn't come with that. Basically, it's a useless product. I was planning to return it, but Amazon website doesn't let you return it, when I looked closely at the product page, it shows 'No Returns Accepted'. So, it's total waste of many and time and effort. Manufacturer knows they are selling a bad products that's why they don't accept the returns. Lost the many, time and labor for the handyman, total disaster and had to buy a different product.

I have only been using this fan (8 inch w/ controller) for a few days so this is an initial impression. For those interested, read on later for tests that I conducted. The fan comes with a controller and a temperature and relative humidity sensor. The fan alone WILL run without any of these hooked up, but it will be at full speed. The amazing part is the controller that will allow the fan to be run at ten different speed settings. It appears to draw a lot less current than the fan I replaced, although that was 10 years old or so, and it runs quieter even though it moves the air 12% faster than the old one. It also can be run with only the controller attached but not the T/RH sensor, so unless you need to have it turned on/off at specific T or RH settings, it does not need to be hooked up. I can't imagine buying the model without the controller, which is nearly the same price. Following is the technical information. Speed setting 10 - full: 67 watts, 2800 ft/min (all readings are at no load/resistance right at the fan outlet. Ducting friction will reduce the air flow. For my situation with 3-90 degree elbows and 50 feet of flexible spiral ducting, the outlet is 1600 f/m at the 10 setting); 9: 57 w, 2500 f/m (89% of full speed); 8: 47 w, 2300 f/m, 82%; 7: 41 w, 2200 f/m, 79%; 6: 35 w, 2000 f/m, 71%; 5: 29 w, 1900 f/m, 68%; 4: 24 w, 1800 f/m, 64%; 3: 19 w, 1600 f/m, 57%; 2: 12 w, 1350 f/m, 48%; 1: 6 w, 1000 f/m, 36%. For comparison, another fan I have with a variable speed L to H controller, the lowest speed is 73% of the maximum. If you want a wider range of speeds available, particularly at the slower end, this fan is a fantastic option at an unbelievably low price. I have already ordered several others. Even if it fails in a year or two of nearly continuous use, it is still a great value.

I've always struggled with adequate sleep, often waking up sweating. My Oura ring says I wake up 5-10 times a night. I read about Elon/Zuck touting the 8Sleep solution but no way I can afford $3K to cool down my bed. Then saw the Bedjet and it was still too much to try on a whim. So armed with this duct fan and a length of duct hose, I rigged up a cheap setup to test it out. First, I'm so glad I purchased this model specifically. 1) Speed 1 (lowest speed) is quiet enough to sleep with (almost indiscernible with my ears) and yet provides enough air flow even through 16' of corrugated hose to cool a king sized bed. Many other duct fans I considered only have two speeds which I suspect are both too loud and too much airflow. I will say that 2 is a bit louder and likely tolerable while sleeping, but any of the higher speeds and things get noisy. If you're a fan of white noise, it might work. 2) The temperature and humidity sensor and triggers let me be creative to try and trigger the fan only when temps rise above a set comfort level. Leaving the fan on all night seems to be a bit too cool to fall asleep to. I've only tried it two nights now, but my Oura ring is telling me I'm not waking up in the middle of the night and I'm waking much more rested than I can remember. I initially tried the duct down by my feet but it chills your feet too much so slept with it about 1/3 up the bed mostly chilling the torso. The way your sheets/blanket are situated will really control where air flows. Keep the sheets taught with an exit by your neck and you've got wind flowing along your body (too cold). Create a bubble and it just keeps the area cool without a lot of actual wind exiting the sheets. In the future I want to try and couple of modifications including capping the end of the hose and punching holes along the length and having it lay across the entire length of the bed, and more experiments using the temp/humidity sensor to create something that responds dynamically versus on all night. Highly recommended as a sub-$80 bed jet alternative or to even see if you like it.