MORENTO Smart Air Purifier Review: a solid Wi‑Fi purifier for big rooms that actually changes the air

I’ve been using the MORENTO HY4866-WF smart air purifier for a few weeks in a flat with a smoker, a dog, and a dusty old building. So basically, perfect torture test. I didn’t baby it: I stuck it in the living room first, then moved it to the bedroom, and let it run mostly in auto mode. I also linked it to the app and Alexa to see if the “smart” side was useful or just a gimmick.

First thing: it does clean the air. You feel it most if you have smoke, pet hair, or allergies. When my flatmate smoked near the kitchen, I could see the air quality number on the screen shoot up, and within a few minutes it dropped again while the fan ramped up. Same thing after cooking or when I opened the window on a busy street. It reacts pretty fast, not in 30 seconds, but you clearly see it doing its job within a couple of minutes.

Noise-wise, I was a bit worried, because a lot of purifiers are either loud or useless. On this one, sleep mode is actually quiet enough for me to sleep with it on, and I’m picky with noise. On low and sleep you mostly get a light whoosh, more like background noise. On high it’s audible, of course, but not like a hair dryer. You’ll notice it if you’re watching TV at low volume, but it’s still okay.

Overall, first impression was: decent build, easy setup, and it really improves the air in a medium to large room. It’s not perfect, and there are a couple of design choices that annoyed me, but for the price range it sits in, it’s a pretty solid option if you want something that actually filters stuff and not just a fancy fan with lights.

Price-wise, this sits in the mid-range of home air purifiers. Not the cheapest plastic fan with a small filter, but also not in the premium Dyson-type territory. For what you pay, you get a HEPA filter, real-time air quality sensor, auto mode, Wi‑Fi, app control, and voice assistant support. In practice, that’s a decent feature set. The main question is whether the ongoing cost of filters and the few design compromises are worth it for you.

On the positive side, the performance and comfort are strong for the price. It genuinely improves air quality in a flat with smoke, pets, and dust. The noise levels are low enough to run it almost constantly, especially in sleep or low mode. The auto mode and app mean you don’t have to think about it much. Compared to cheaper purifiers without sensors or smart control, you’re actually getting a more useful device here, not just extra lights.

On the downside, no pre-filter means filters could need replacing more often, and even if replacement filters are "more reasonable" than some competitors, that still adds up over a year or two. The cable feeling flimsy also doesn’t help the perceived value. Some competitors in the same price range offer automatic light dimming or a better physical design. So it’s not the best deal on every single detail, but it’s not overpriced either.

If you’re sensitive to dust or pollen, or you live with a smoker or pets, the difference in how the air feels and how often you sneeze is probably worth the cost. If you just want something "nice to have" and don’t really have a clear problem to solve, you might find it a bit overkill and the filter replacements annoying. For me, with actual air quality issues to deal with, I’d say it’s good value for money, as long as you go in knowing it’s solid but not perfect.

Design-wise, it’s pretty standard: white plastic body, rectangular shape with rounded corners, air intake on both sides, and air outlet on top. It doesn’t scream high-end, but it doesn’t look ugly either. It blends into a corner of the living room or bedroom without drawing too much attention. Size-wise, it’s not tiny: about 44.5 cm tall, so more like a small tower fan than a desktop gadget. You’ll want it on the floor, not on a shelf.

The control panel on top is clear. The icons are easy to understand, and the air quality ring with colours (green/blue = clean, yellow = medium, red = bad) is handy. You don’t need to open the app just to know what’s going on. One thing I liked is that the display can be turned off in sleep mode, so you’re not stuck with a bright LED in your face all night. But: there’s no light sensor, so it won’t switch to sleep by itself when the room gets dark. You actually have to remember to press the sleep button or do it from the app.

The weak spot in the design is the power cable. It’s quite thin and feels cheap compared to the rest of the unit. Some users even mentioned theirs broke early and they had to replace it. Mine hasn’t failed yet, but I’m careful not to tug it or bend it too hard. For a device that’s supposed to run for hours every day, they could have used a sturdier cable. Also, there’s no built-in handle, so moving it around with one hand is a bit awkward, especially if you’re trying not to drag the cable.

Overall, the design is practical and neutral, but nothing special. It fits in a modern flat without clashing, the interface is clear, and the double intake is a good idea. On the downside, some details feel a bit cost-cut, like the cable and the lack of automatic dimming. If you want something that looks like a design piece, this isn’t it. If you just want a white box that quietly does its job in the background, it gets the job done.

In terms of build, the unit feels decent but not premium. The plastic casing is solid enough, no weird creaks when you move it around, and the top panel doesn’t feel flimsy. The buttons are touch-sensitive and have held up fine so far. I moved it from room to room several times, and nothing felt like it was about to snap. At around 8 pounds, it’s light enough to carry, but I do wish there was a proper handle on the back to make it easier.

The part that will decide long-term durability is the filter system and the power cable. The filters sit in the base and are easy to remove and replace. There is, however, no real pre-filter layer you can just rinse or vacuum. Most other purifiers I’ve used have a mesh or foam you can clean to catch the big stuff (hair, fluff) before it hits the HEPA. Here, everything goes straight into the main filter. That means you’ll probably have to replace filters more often, especially in homes with pets or heavy dust. The app telling you the filter life helps, but it doesn’t change the fact you’ll spend a bit more over time.

The cable is the weak link. It’s thin and doesn’t inspire confidence. Mine is still fine, but I’m careful with it because I’ve seen other users report that theirs broke and they had to replace it. For a device that’s supposed to sit plugged in 24/7 and sometimes be moved around, that’s not ideal. It’s not a deal-breaker, but it’s a corner they clearly cut to keep the price down. If you’re rough with cables or you plan to move the purifier a lot, that’s something to keep in mind.

Overall durability impression: the main body and electronics seem fine for long-term use if you don’t abuse it. The filter replacement system is simple, though slightly more expensive to maintain because of the lack of a washable pre-filter. As long as you accept that you’ll be buying filters regularly and you treat the cable with a bit of care, it should hold up well enough for everyday home use. It’s not a tank, but it doesn’t feel like a disposable gadget either.

Performance is a mix of how fast it cleans, how loud it is, and how annoying it is to manage. On cleaning speed, for a device rated for up to 1076 ft², it handles normal-sized European rooms very comfortably. In a large open-plan living room it obviously works harder and longer, but in a bedroom or office it’s more than enough. The double intake really helps it pull in air quickly from both sides instead of just one front panel.

Noise levels are where it’s actually quite good. In sleep mode, it’s under 24 dB on paper, and in practice it’s basically a soft whoosh. I could sleep with it on without it bothering me, and I’m used to a quiet room. On low and medium, it’s still fine for working, calls, or watching TV. On high, you hear it clearly, but that’s usually only when the air quality is bad (smoke, heavy dust, strong smells), and it doesn’t stay at max power forever. Once the sensor sees the air get cleaner, it ramps back down.

The app (Havaworks) and Wi‑Fi are more than just a toy. I used the scheduling to have it turn on an hour before bedtime in the bedroom and then switch to sleep mode. Being able to check the PM reading on my phone is also handy when I’m in another room. The filter life monitoring is a plus too: instead of guessing when to buy new filters, you can see the remaining percentage. Voice control via Alexa / Google Assistant is basic but works. The main commands are on/off and mode changes, which is honestly all you need.

One thing to note: there’s no pre-filter you can easily vacuum to extend the main filter life. That means the main filters will probably clog faster if you have pets or a lot of dust. Replacement filters are not outrageously priced compared to some brands, but because you don’t have that washable layer, you might be changing them a bit more often. So pure performance is good, but long-term running costs are something to keep in mind. Still, for daily use, it’s efficient, quiet enough, and the smart features actually make it easier to live with instead of just adding complexity.

Out of the box, you get the purifier, the two base filters already there, and a thin power cable. Setup is straightforward: take the plastic off the filters (don’t forget that, common mistake), plug it in, and you’re basically ready. The touch controls on top are simple enough: power, fan speed, auto mode, sleep mode, and Wi‑Fi. There’s also a coloured air quality indicator plus a number, so you can see if the air is "good" or "trash" at a glance.

The double side air intake is what makes it feel efficient. It pulls air from both sides and pushes it out the top, so you don’t need to obsess over where exactly you place it. I had it on a landing between rooms for a few days and it still managed to keep the numbers reasonable in both the hallway and bedroom. The CADR rating (300 m³/h) matches what I saw in practice: in a 20–25 m² room, it takes a few minutes to calm down after smoke or cooking smells.

The “smart” side is handled by the Havaworks app. Once connected to Wi‑Fi, you can see real-time air quality, switch modes, set schedules, and check filter life. It’s not fancy, but it’s functional. I liked being able to turn it on from my phone before getting home, so the room already felt fresher when I walked in. Voice control with Alexa also works: basic stuff like "turn purifier on/off" or "set to auto". Nothing magical, but practical if you’re already using voice assistants.

In daily use, I mostly left it in auto mode and forgot about it. It ramps up when something pollutes the room (smoke, aerosols, frying, fireworks outside) and then drops back down. That’s the main thing I want from a purifier: I don’t want to babysit fan speeds all day. On that point, it delivers. Where it’s less strong is small usability details, like having to manually put it into sleep mode at night instead of it dimming itself automatically when the room goes dark.

This is the part that matters: does it actually clean the air or just blow it around? In my experience, it does a good job. With a smoker in the flat, I had several chances to see how it reacts. When he lit a cigarette near the kitchen, the air quality reading jumped above 300–400 within a minute, and the ring turned red. The fan kicked up to a higher speed by itself in auto mode. After about 5–10 minutes, the reading dropped back under 20, and the smell in the room was clearly reduced. Not gone like magic, but much less heavy.

On the dust and allergy side, I noticed a difference after a few days. I usually wake up with a bit of a stuffy nose when the room is dusty. With this running in the bedroom for a week, that feeling was reduced. You also see less dust settling on furniture if you keep it on regularly. It’s not like dust disappears completely, but you don’t get that thick layer as fast. The HEPA filter is rated for particles down to 0.3 microns, so fine dust and pollen are basically what it’s designed for, and that lines up with what I felt.

Another test was cooking and fireworks night. Frying food or doing something smoky in the pan made the sensor spike and the purifier ramp up within a short time. Same thing during fireworks: with the window slightly open, the indoor air quality got worse, and the purifier reacted on its own. That’s where you see the benefit of the built-in sensor and auto mode. You don’t need to think about it; it just speeds up when needed. The cleaning speed is decent for medium to large rooms. In my 20–25 m² living room, it brought the air back to “good” in under 10 minutes most of the time.

It’s not a miracle cure for every smell. Strong cooking smells or heavy smoke still linger a bit, especially in fabrics, but the general air feels lighter and less stuffy. For allergies and dust, it’s clearly helpful. For smoke and pet hair, it won’t erase the source, but it takes the edge off and makes the room more bearable. So in terms of pure effectiveness, I’d say it’s pretty solid for the price bracket and better than the cheaper basic purifiers that don’t have sensors or proper HEPA filters.