Hon&Guan 4 Inch Inline Booster Duct Fan with Speed Controller - 130 CFM Airflow with 6W Ultra-Low Power and Low Noise

I bought this to ventilate a small paint booth I had thrown together while working on restoring some old car parts. This fan is very quiet, smooth, and pushes a lot of air. It's compact yet powerful, and the adjustment allows me to raise the speed when spray painting to get rid of overspray, and slow things down to let the paint off-gas/cure quicker. The fan has held up against a lot of spray paint being sucked right into it and has no issues. It works as I intended, and the included clamps are a bonus.

So far this fan works great. Using it to vent out cat litter smell and so far it is working like a charm. I like the variable speed control, works perfect. Has a hum to it but I wouldn't say it is loud. I have this fan in the laundry room venting the cat litter box. Well, it worked a little to good and was venting warm air from the house. Not the whole house but any room connected to the laundry room. So it does have some power to it.

Powerful and quiet. Added this to the hot exhaust air on a portable AC unit because it had a long duct length and was not cooling very well by itself. Now the AC unit owrks without a problem.

Bought this to create a knockoff bed jet and it works great. This thing can move air and isn’t that loud when a window ac going and air purifier. It makes about the same noise. Great price out and very easy to setup. I really like the controllable speed. Does a great job cooling. I like the all black look. I would recommend this product.

Its been a great little fan....I have been running it nonstop since February of 2025...its not very loud at all...I use it for 3D printing

For the price its fine, but expect it to be fairly noisy, or at least the pitch of the sound being pretty annoying for the modest airflow it produces. It also has absolutely no static pressure ability (its a PC fan in a plastic tube) so any air resistance from even the most open of vent openings will reduce airflow and increase noise. If the low price is essential for you, its durable enough plastic and PC fans tend to last a long time so its decent enough. But if you need more airflow or have anything with even the lightest bit of resistance of flow (vents, some length of ducting, etc) its not very good.

I love to cook but hate the smell of a kitchen so when I remodeled I decided to upgrade my exhaust system and was not disappointed...I liked it performance so much I purchased a second one for my restroom....ton notch air movement and variable speed for different uses...very impressed 👍👍🤟🤟

Got this to vent resin printer fumes out the window. After messing around with it a bit it seems like it's up to the task. [UPDATED REVIEW 5/5/24] To stress test the fan a little, I left it by the window for 2 days, running non-stop at half power. Not exposed to direct sunlight or rain, on a level surface, etc. Normal working conditions. The fan eventually developed a rattle, like the fan is unbalanced or something. The rattle comes and goes. It's still quiet enough that the hose and enclosure mostly muffle it, but it's definitely concerning, and disappointing considering the good first impression it gave me. Maybe spend the extra 2 bucks on a metal exhaust fan instead, assuming those are sturdier. [CONSTRUCTION] This 4-inch inline fan is made of lightweight plastic, including the blades. Its tough not to be snarky and say this is basically a glorified computer fan, but that's the impression it gives because of all the plastic. The housing is sturdy though, it won't flex unless you're cranking down on the hose clamps at the ends (hose and clamps not included). This is actually one of the nicer products I've bought from Chinese manufacturers, it doesn't have that worrisome "cheap" feeling. If the plastic is a dealbreaker for you though, there are def more options in the same price range that have a metal housing instead, with varying CFM. This unit comes with a stepless dial-like controller to adjust the fan speed. There are no guards over the fan blades so don't stick your fingers in there, and don't leave it out for curious pets to play with. [NOISE] This fan can be quiet and noisy depending on the power level. When set somewhere between 45%-90% power there's an underlying mechanical whine. It doesn't sound like anything is loose or broken, it's more like the sound a jet turbine naturally makes as it ramps up in speed. I actually think it sounds cool, but I can understand why some people don't like it. Without the whine it simply sounds like a strong computer fan. I could sleep with it in the room, but maybe not at full speed. Playing with the speed controller is almost therapeutic. Don't bother with fidget spinners, get one of these fans instead! [IN USE] I used this to ventilate a small resin 3D printer enclosure, and the 130 CFM Hon&Guan claims for this unit is more than enough for the task. I can set it to under the 40% power mark (where the mechanical whine starts to be noticeable) and it's still effective. I have a short hose though, if you're running a hose across the room you may need more power, or even a second inline fan. (There is a 6-inch version of this fan available if you need a lot more CFM.) I left it running at max power for a few minutes and haven't noticed any hot spots on the fan housing or controller, but I will keep checking on that. If you're using this fan to vent fumes, VOCs, etc., be sure the air you blow out the window isn't being blown back in by the air outside, or getting sucked back in through a different window haha. Also maybe consider putting some netting over the exhaust end to keep bugs from getting in when not in use. Another tip, try to install the fan as close to the window as possible. What you want to do is have the fan pulling air out of the hose/enclosure, not pushing it through. Pulling air prevents the polluted air from escaping from any leaks in your ventilation system, while pushing air through the hose will push it out of all those leaks along the way. [RECOMMENDATION] This is one of the cheapest and most streamlined options for resin printer ventilation on Amazon, and thankfully it works great. I will update this review if I find any long-term issues.

Great quality. I cut the end off to wire to my 12v controller. Please disregard the negative seller feedback. Thank you

I'm writing because these units so far have worked incredibly well. I own three different models,..and a total of 14 units. I have 3 three of these 8 inch "Booster" models,..I am using these to clear the air where i live. Both intake air and out. Very powerful fumes are emitted by the upper tenants,..(This is Canada ) These units have been "Generally" going 24/7 at one speed or another, and even next to open windows all year round. I live in Milton, Ontario,..and we have many humid summer days, and Canadian winters,...more recently,.i accidently dropped one of these units, and it hit a pointed corner bathroom vanity top at the fan blade and broke the fan blade. i immediately contacted HON & GUAN at one of their email addresses,..explaining i had damaged the unit and would like to pay for replacement parts and/ repairs,...they asked me to email my Order # (Amazon) and WOW!,..WOW! again,..HON & GUAN were SO KIND,....THEY SENT ME A REPLACEMENT "FREE OF CHARGE" AND ALSO SENT ME AN ADDITIONAL 4 INCH MODEL AS WELL..WOW!,..WHAT A COMPANY.

Good for its job and price

exhaust powe Good

Really improved the air flow of my spray booth. Highly recommended. The only thing is I wish I had bought is a higher CFM.