KNOKOO FES350 Laser Cutting Fume Extractor, 350W Strong Suction 420 m³/h Air Flow Activated Carbon Smoke Extractor for Laser Engraver and Welding&Laser Aesthetic Business(350 Watts)

This 350W KNOKOO fume extractor has a 4-layer filter system, and when I used it, the smell of the laser at work was gone. These smells used to bother me, and I was afraid they would hurt my lungs. I bought it for my health. When I first received it, I contacted them to use it correctly, and their service staff was very good at contacting me quickly. I received all the required information and guidance.

I've had this fume extractor for nearly two years and am satisfied with its performance for extracting fumes for laser etcher. Good purchase.

I have a 90 Watt CO2 cutting laser that is my bread and butter, and I used to vent the smoke out of my window... until a neighbor saw it and called the fire department. I investigated many exhaust filter systems, and upon seeing the listing for the FES350 I emailed the manufacturer and asked: "I have a 90W CO2 laser cutter that I use heavily. Will your machine filter that kind of smoke, and (if so) for approximately how long before I would have to replace one or more filters?" They responded promptly: "our FES350 is suitable for most laser machines, including yours 90W CO2 laser cutter machine. The replacement cycle of the filter depends on the actual usage environment and intensity. We have a recommended replacement cycle for your reference. FES350 1st pre-filter cotton is replacement time is 10-60 day. middle HEPA filter is replacement time is 5-9 months. 3rd carbon filter replacement time is 5-9 months. main filter is replacement time is 6-12 months." Imagine my reaction when ONE WEEK after starting to use the machine, the alarm beeped to indicate a clogged filter. I quickly established that it was the "middle HEPA filter" that was saturated to the point that it could no longer pass air. I wrote to the company and described both the problem and my displeasure, and asked how they proposed to make it right. Here is their entire response: "our replacement cycle is based on the recommended time derived from laboratory data. Most of the machines available on the market follow this standard. However, each customer's usage environment and intensity are different, so the replacement cycle will not be exactly the same for everyone. Considering the actual usage differences of customers, our filtration system design initially adopted a four-stage filtration system. Customers can replace each layer of the filter separately according to the usage intensity, so as to save on usage costs. The selling price of our filters also maintains a relatively low profit margin, which is much lower than the selling prices of our competitors. I'm sorry to hear that you are troubled by this issue. However, you can compare our products with similar ones on the market. I believe our product descriptions are reasonable and the selling prices are very competitive." Translation: "Not our problem." If I have to replace my medium filter every week, I'll be damned before I throw any more money to Knokoo, particularly as their filters are hardly as cheap as they seem to think. Replacement F2-sized HEPA filters for the 3M Filtrete Room Air Purifier appear to be the same in one dimension and only about an inch shy in the other -- a gap which should be easy to seal -- and they are about $15 each. Three stars because the unit's powerful fan sucks in a good way, even though the company's honesty and policies suck in a bad way. Caveat emptor.

Generally good experience. I upgraded from smaller filters and this worked reasonably well for my laser cutting. It cost a lot less than other "laser filters" on the market and worked good enough for my needs. Notes / points of friction: -The hose keeps falling off the top which can impact usability quite a bit. This is the main reason I gave it 4 instead of 5 stars. At this price point I expect this to be better. I might hot glue it in place -It is supposed to come with a remote control? I could not find it in the box. However you can order replacements for not too much from ali express -I still smell the laser exhaust, but its much reduced and I think its typical for a unit of this size -I'm cutting a lot of material kicking up dust. This filter will loose suction power unless I occasionally shake / clean it out. This restores suction for me

Using with XTools P2. Worked ok, with with slight smell for 2 weeks. When contacting Amazon to inquire of malfunction, company never replied. Machine no longer suctions and smoke is everywhere. It runs just long enough to break and miss the return window.

Arrived quickly. Packaging was like a tank, a double thick box with fitted sections. Great customer service from Knokoo; though a 110 volt machine it had been shipped with a euro 220 cord. The 110 cord is on the way. Solid machine, well built, highly recommend both the machine and Knokoo. Filters are easy to find and relatively inexpensive, and this machine is robust enough to handle light TIG welding fumes and even occasional stainless steel (though the right respirator should always be worn).

Never have owned one of these before but, this one seems to work well. I have my attached to an enclosed laser that I cut wood with - while the smell in the shop is dramatically reduced, you can still tell that wood has been cut with a laser - a slight camp fire smell. For not exhausting a hose outside (making a hole in the wall to a building I am renting), I am pleased with it's ability to greatly reduce the odor in my shop!