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.

Plugged it in and worked no problem. Quality seems pretty good, no crazy vibrations. Not too loud on lower settings but I like that you can adjust it with the dial. Airflow seems adequate.

Update (1 year later)... One star deduction. The fan power supply died just short of 1 year. The fan started cycling on and off. I replaced the power supply with a 24 volt non-adjustable type and the fan is working great again. In fact, I like the air volume so much I just purchased the same model for my other son's room. The factory power supply runs extremely warm so I'm not expecting it to last. I'll be ready with a 24 volt model when it happens. I have a second floor bedroom used for PC gaming that gets unbelievably hot in the summer. Installing a booster fan in the 6" duct leading to that room mostly solves the problem. I had a 240 cfm all metal duct fan running for about three years that finally died. It was noisy and didn't seem to push as much air as advertised. This Hon&Guan model is a major improvement. Although being 100% plastic, it still easily mounts to the duct using aluminum duct tape. The claimed 345 cfm airflow is no lie. I plugged it in before installation and it rearranged all the papers in my kitchen. Compared to the twice as expensive home center metal duct fan, this one has 100 cfm greater capacity, half the power usage, adjustable speed and lower noise. My son gave me the thumbs up after a day of use. His room stays in the mid-70's (deg F) compared to 87-89 (deg F) without the fan. It is only activated when the furnace blower runs so it is not constantly on. If it lasts a few years I'll be very satisfied.

This inline booster fan worked great for my fog machine at Halloween! It comes nicely packaged up and protected and sets up in under a minute. I have a custom-built fog-chiller that pushes out a TON of fog. Over the years, I noticed that the fog doesn't make it far enough into my graveyard scene so this year I added this little item. My setup involves a fog machine, a fog chillder, 6 feet of dryer duct hose and this booster duct fan. My fog machine feeds directly into the fog chiller which cools the fog and keeps it lying low to the ground. The dryer duct hose is connected on the opposite (exit) end of the fog chiller where the cooled fog exits. The variable speed booster duct fan is on the other end of the dryer duct hose to draw the chilled fog out and disperse it. The variable speed switch is great for adjusting the speed of the fan to get the right volume of fog to disperse. The only caveat is that the fog residue builds up on the fan blades, which is easily remedied by cleaning them after using it with a fog machine. I highly recommend this item for use with a fog machine. (DISCLAIMER: The diagram provided below was generated with ChatGPT and is for illustrative purposes only of where the booster fan is placed in my fog chiller setup. The drawing is not to scale and is not a proper representation of the size/shape/design of the Booster Duct Fan with Speed Controller.)

Using to boost flow upstairs where hot air is stagnant. Works wonderfully. I have it plugged into a smart outlet so it works with Alexa. A little loud on high but works amazingly, very well built and fit perfect .

Works well and moves high volume of air but it is loud. The sound is ok at the lowest setting only. If I didn’t need a quiet fan, I would keep it. But it’s too loud for my use.

This fan is quiet & produces a good amount of air at medium to low setting. At 19.5 watts of consumption it’s another plus. Durability & longevity …..time will be the test.

Good for its job and price

exhaust powe Good

Excelente calidad y sí es de ABS, llego en 4 días.

It works really well, very efficient love the product.

I dunno what the other negative comments are about - but the volume and air flow is great. The volume isn't very loud. You can hear the fan, but it's not annoying. Also, if you're sitting next to it, i guess it would be loud. But it is a duct booster fan so it'll be used in a wall or drop ceiling or something. I'm using it to suck the air out of my server pantry at the top. It works fantastic and sure pushes a ton of air! i don't even have it full. I'm guessing it's set around 3/4 to keep the volume down a bit.