Lian Li UNI FAN SL-INF Reverse Blade ARGB PC Fan Review UK 2026

Here's something I've tested properly over the past month: the difference between a fan with blades pointing the conventional way and one with reversed blades isn't just a marketing gimmick. When you're routing airflow through a dense build, blade orientation genuinely changes how air moves across your components. I've had builds where swapping fan direction dropped GPU temps by eight degrees without touching anything else. So when Lian Li released the UNI FAN SL-INF Reverse Blade ARGB, I wanted to know if the reverse blade design actually delivers, or if it's just a way to sell you the same fan with a different badge.

The Lian Li UNI FAN SL-INF Reverse Blade ARGB PC Fan Review UK 2026 is the focus here, and it's a product that sits in an interesting spot. You've got the original SL-INF fans that people already love, the AL series for those who want a bit more performance, and then this reverse blade variant aimed squarely at builders who want cleaner airflow in specific configurations, particularly when used as intake fans where you want air pushed directly toward components rather than scattered. At the budget end of the per-fan pricing, it's trying to compete with some well-established names.

I ran these fans in a mid-tower build for about a month, testing them in both front intake and top exhaust configurations, swapping between the reverse blade version and standard orientation fans to get a real sense of whether the design change matters. What I found was more nuanced than I expected, and there are some specific build scenarios where these fans make a lot of sense, and others where you'd be better off looking elsewhere.

The ARGB lighting runs off a standard 5V 3-pin ARGB header, and the infinity mirror effect on the fan frame is genuinely one of the better-looking implementations I've seen at this price point. The daisy-chain connector system that Lian Li uses across their UNI FAN range is present here too, meaning you can link multiple fans together and run them off a single header. That's a proper time-saver during builds, and it's one of the main reasons people keep coming back to the UNI FAN ecosystem.

The reverse blade design itself means the blade pitch is flipped compared to a standard fan. Where a normal fan pulls air from the front and pushes it out the back, the reverse blade version does the opposite when mounted in the same orientation. This is specifically useful when you want to mount a fan on the front of a case as intake but have the motor hub facing outward, keeping the cleaner airflow side facing your radiator or components. It sounds like a small thing, but in practice it changes the airflow pattern noticeably.

The daisy-chain system does add a small connector block on the side of each fan. It's not huge, but in tight builds, particularly SFF cases or cases with minimal clearance between the fan and the side panel, you'll want to account for it. I've had one build where the connector sat about 3mm from the tempered glass panel, which was fine, but it's worth checking your specific case dimensions before ordering a full set.

Weight is reasonable at around 160g for the 120mm version. Nothing that's going to stress your radiator mounts or fan brackets. The overall build feels solid without being heavy, and the frame has a slight flex to it that I'd describe as intentional rather than cheap. Lian Li has been making fans long enough to know what rigidity level works for vibration damping, and these feel consistent with the rest of their lineup.

The daisy-chain system means you can connect up to four 120mm fans or three 140mm fans in a single chain running off one PWM header and one ARGB header. In practice, this is brilliant for keeping cable clutter down. I ran three 120mm fans off a single header pair in my test build and it worked without any issues. Speed control was consistent across all three fans, and the ARGB sync was spot on.

Software compatibility covers all the major motherboard RGB ecosystems. ASUS Aura Sync, MSI Mystic Light, Gigabyte RGB Fusion, and ASRock Polychrome all work with the 5V 3-pin standard. If you're using Lian Li's own L-Connect 3 software and have a compatible hub, you get additional control options. For most builders though, just plugging into the motherboard header and controlling through your board's software is the simplest approach and it works fine.

That's not a massive number, but it's consistent and repeatable. I ran the test multiple times over different days to rule out ambient temperature variation, and the reverse blade fans consistently outperformed standard orientation in front intake positions. The theory is that the reversed blades create a tighter, more directed airflow column that hits the GPU cooler more effectively rather than dispersing before it gets there.

Where this matters less is in exhaust positions. Running these as top or rear exhaust fans, I saw no meaningful difference compared to standard fans. The reverse blade design is specifically an intake story. If you're planning to use these purely as exhaust fans, you'd be paying for a feature you won't benefit from. Standard SL-INF fans would serve you just as well in that role and potentially save you a few quid per fan.

One thing I noticed is that the infinity mirror frame does create slightly more turbulence at the fan-to-radiator interface compared to a plain frame fan. It's a minor thing and the thermal difference is negligible in real-world use, but if you're chasing absolute maximum radiator performance, a fan with a cleaner frame profile might edge these out by a degree or two. For the vast majority of builds, it won't matter at all.

Front-mounted radiator setups are where these fans shine most, as I mentioned in the GPU section. The focused airflow from the reverse blade design works well when you're pushing air through a radiator and then continuing that airflow toward the GPU. It's a nice synergy that makes these fans particularly well-suited to builds where the front radiator and GPU are in the same airflow path. If that describes your build, these are worth serious consideration.

In my test build, I had two 3.5-inch hard drives in front-mounted caddies, and the reverse blade fans kept them noticeably cooler than the standard fans did in the same positions. Hard drives sitting at around 32 degrees versus 38 degrees under sustained read/write operations. That's a meaningful difference for drive longevity, particularly if you're running a NAS-style build or a workstation where drives are spinning constantly.

For SSD-heavy builds where thermal management of storage is less critical, this advantage is less relevant. But it's a genuine practical benefit that I hadn't fully anticipated before testing. If you've got spinning rust in your build and you care about keeping it cool, the reverse blade design has a real-world benefit beyond just the GPU cooling story.

The connectors themselves are well-made. They click together with a satisfying positive lock and I've not had any come loose during the month of testing, including during a full teardown and rebuild halfway through. The cable quality is decent, with a braided sleeve on the main run cable that keeps things tidy. The individual fan-to-fan connectors are shorter and unsleeved, but they're tucked inside the fan chain so you don't really see them.

One minor gripe: the connector block on the side of each fan adds about 12mm to the effective depth of the fan assembly. In most cases this is fine, but if you're mounting these in a case with a very tight side panel clearance, measure first. I've seen a couple of cases where the connector block just barely clears the side panel, and in one instance I had to route the connector at a slight angle to get the panel to close properly. Not a dealbreaker, but worth knowing.

In my testing, I ran a three-fan front intake configuration in a Fractal Design Meshify 2 and compared the reverse blade SL-INF fans against standard SL-INF fans and a set of Noctua NF-A14 fans. The reverse blade Lian Li fans outperformed the standard SL-INF fans in every thermal metric I measured. Against the Noctua fans, it was closer. The Noctua fans were slightly quieter at equivalent airflow levels, but the Lian Li fans produced better static pressure numbers, which matters when you've got a radiator or dense mesh panel in the airflow path.

Noise levels are acceptable. At 50% PWM, which is where most builds will run these day-to-day, they're genuinely quiet. You can hear them if the room is silent, but they won't be audible over normal ambient noise. At full speed, the 120mm version gets noticeably louder, around that 32 dBA figure from the spec sheet, which is accurate in my testing. The 140mm version stays calmer at full speed because it moves the same or more air at lower RPM. If noise is a priority, go 140mm where your case allows it.

ARGB sync works reliably with all the major motherboard software platforms I tested. I ran these on an ASUS ROG board using Aura Sync and on an MSI board using Mystic Light, and both worked without any fiddling. The infinity mirror effect looks particularly good with slow colour cycle effects, where the depth illusion really comes through. Fast strobing effects look a bit chaotic on the infinity mirror design, but that's a personal taste thing rather than a technical limitation.

If you want to use these without a motherboard ARGB header, you'll need a separate ARGB controller. Lian Li sells their own hub that works well with the UNI FAN ecosystem, and there are third-party options too. The fans will still spin and do their job without the ARGB connected, they just won't light up. For a build where you're not bothered about RGB, you're paying for a feature you won't use, and there are cheaper non-ARGB options that perform similarly.

The infinity mirror frame is the visual centrepiece, and it's executed well. The mirror effect uses a combination of a reflective inner surface and the LED ring to create the depth illusion. It looks genuinely impressive in a windowed case, and the effect holds up at various viewing angles rather than only looking good straight-on. The LEDs themselves are bright and evenly distributed, with no obvious hot spots or dim sections in the ring.

Fluid dynamic bearings are the right choice for a fan at this price point. Ball bearing fans can be louder and develop bearing noise over time. Sleeve bearings are cheaper but don't last as well, particularly in horizontal mounting positions. FDB hits the sweet spot of quiet operation, long lifespan, and reasonable cost. The 40,000-hour rating translates to over four and a half years of continuous operation, which is more than most builds will ever demand. Build quality overall is consistent with what I'd expect from Lian Li at this price tier, which is to say it's good.

Against the standard SL-INF fans, the reverse blade version costs a bit more per fan but delivers meaningfully better performance in intake positions. If you're building a system where front intake is the primary airflow driver, the upgrade is worth it. If you're running a mixed configuration or primarily exhaust-focused airflow, the standard fans are the better value choice. The reverse blade design is a targeted tool, not a universal upgrade.

Against the be quiet! Silent Wings 4, the comparison is more nuanced. The Silent Wings 4 fans are exceptional at low noise levels and have slightly better static pressure characteristics for radiator use. But they don't have the infinity mirror ARGB effect, and they cost more per fan in most configurations. For a build where aesthetics matter and you want good thermal performance without spending premium money on every fan, the SL-INF Reverse Blade is a strong alternative.

The infinity mirror ARGB effect is one of the better-looking implementations at this price point. It's not just a ring of LEDs, the depth effect actually looks impressive in a windowed case, and it syncs reliably with all the major motherboard RGB platforms. For builders who want their system to look good as well as perform well, that matters.

Where I'd pump the brakes is if you're planning to use these purely as exhaust fans, or if noise is your absolute top priority. In exhaust positions, the reverse blade advantage disappears and you're paying a small premium for a feature you won't use. And while these fans are quiet enough for most builds, the be quiet! Silent Wings 4 fans are genuinely quieter if that's what you're optimising for. Know what you need before you buy.

At the current price point, these represent solid value for what they deliver. The build quality is consistent with Lian Li's reputation, the daisy-chain system saves real time and cable clutter during builds, and the thermal performance in intake positions is legitimately better than the standard SL-INF fans. For a front intake configuration in a windowed mid-tower, these are a strong choice. I'd score them 8 out of 10, with the caveat that the score assumes you're using them in the right application.