QuietSpecs

We may earn a commission when you buy through links on this page. As an Amazon Associate we earn from qualifying purchases. How we compare products

Quietest 60mm fan: Sunon's 24V MF60252V3 lists 16.7 dB(A) at 1 m

Written by
· 9 min read

Quietest 60mm fan on the side of a small network switch

Where Sunon and Delta both put the microphone a meter from the intake, Sunon's 24 V MF60252V3 lists 16.7 dB(A) at 3100 RPM, the lowest 24 V figure we found, and Delta's AFB0624L-A lists 26.5 at the same speed.

At 12 V, Sunon's 60 x 10 mm MF60101V3 lists 20.5 dB(A) and Delta's 25 mm AFB0612L-A 26.5. Noctua names no distance: its NF-A6x25 PWM and FLX list 19.3 dB(A) at 3000 RPM and the slim NF-A6x15 FLX 19.8, ranked only against other Noctua fans.

All of these numbers describe an unmounted fan running flat out.

On this page
  1. How we chose
  2. Our picks
  3. How to choose
  4. Comparison
  5. FAQs
  6. Bottom line
  7. Review history

A quick look at the quietest 60mm fans

Sunon's slowest 25 mm MagLev fans list 16.7 dB(A) with the microphone a full meter from the intake, at 12 V and at 24 V alike. The next figure on that basis is 20.5.

These fans cool boxes that sit on shelves and desks all day: routers, network switches, NAS units, small PC cases and the electronics bays of 3D printers. Voltage settles the shortlist before noise does, because a 12 V fan and a 24 V fan are separate parts with separate sheets. Frame depth comes second.

Sunon and Delta both measure 1 m from the intake, so their fans share one list. Noctua prints figures with no distance, and its fans rank only against each other. Every pick was in stock on Amazon under its maker's name when we checked on November 7, 2026, and each one names the basis behind its figure.

The sheets behind this list

A fan made the page only with a noise rating printed by its maker for a part number sold in America, and two brands share a ranking only when they name the same microphone distance.

On November 7, 2026 we went through Sunon's search tool and spec sheets, Delta's US pages and the sheets they link, and Noctua's infosheets. Delta's 60mm sheets are scanned drawings, so their figures were read off the page images. Noctua's site answered "Too Many Requests" to our product page requests. Archived copies of noctua.at at the Internet Archive, dated November 2025 to July 2026, confirmed that each Noctua model is still current.

Amazon served one purpose that day: confirming that each fan could be bought, in stock under its maker's name. No figure or price came from it. None of the three makers shows a price, so no pick lists one.

Each number is the maker's, taken on an unmounted fan at top speed.

QuietSpecs' picks of the quietest 60mm fans

Prices as of Nov 12. Product prices and availability are accurate as of the date/time indicated and are subject to change.

Quietest 24 V fan on the 1 m list, 16.7 dB(A)

Sunon MF60252V3 60x25mm 24V MagLev fan

Sunon MF60252V3 60x25mm 24V MagLev fan
  • Noise: 16.7 dB(A), microphone 1 m from intake, 3100 RPM (Sunon spec sheet)
  • Price: $48.98 at Amazon, checked Nov 12
  • Best for: 24 V printer enclosures, electronics bays and control boxes that take a 25 mm deep fan
  • Skip it if: The mount only takes a 10 or 15 mm frame

Sunon's sheet for the MF60252V3-10000-A99 prints "ACOUSTIC NOISE 16.7 dB(A)" at 3100 RPM and 24 VDC, measured in a semi-anechoic room with the microphone 1 m from the intake. No 24 V 60mm fan on the 1 m basis lists less.

It is a 60 x 60 x 25 mm MagLev fan on a Vapo bearing that moves 16.0 CFM on 0.53 W and starts at 8 V. On Amazon we found it in stock only as a two-pack of the 1000U-A99 part.

Check price at Amazon

Slimmest 1 m pick, 20.5 dB(A) from a 10 mm frame

Sunon MF60101V3 60x10mm 12V MagLev fan

Sunon MF60101V3 60x10mm 12V MagLev fan
  • Noise: Sunon spec sheet: 20.5 dB(A), microphone 1 m from intake, 3000 RPM
  • Price: $30.06 at Amazon, checked Nov 12
  • Best for: Slim 12 V spots such as router lids, NAS backplates and thin cases
  • Skip it if: A 25 mm fan fits, where Sunon and Delta list more air

At "ACOUSTIC NOISE 20.5 dB(A)", taken at 3000 RPM with the microphone a meter from the intake, the MF60101V3 is the quietest 12 V 60mm fan on the 1 m basis that we could also find in stock under Sunon's name.

The frame is only 10 mm deep, so it fits where a 25 mm fan will not, and it moves 12.2 CFM on 0.56 W. Sunon's 25 mm MF60251V3 lists 16.7, but its only Amazon listing was marked scarce.

Check price at Amazon

Delta's slowest 12 V 6025, 26.5 dB(A) at 1 m

Delta AFB0612L-A 60x25mm 12V ball bearing fan

Delta AFB0612L-A 60x25mm 12V ball bearing fan
  • Noise: 26.5 dB(A) average and 30.5 dB(A) worst case, microphone 1 m from intake, 3100 RPM (Delta spec sheet)
  • Price: $60.00 at Amazon, checked Nov 12
  • Best for: Builders who want a ball bearing fan with a published worst case

Delta's specification for the AFB0612L-A lists "ACOUSTICAL NOISE (AVG.) 26.5 (MAX. 30.5) dB-A" at 3100 RPM, and says the meter sat "AT A DISTANCE OF ONE METER FROM THE FAN INTAKE" in an anechoic chamber. Unlike Sunon, Delta prints the worst case beside the average.

At the same 3100 RPM it moves 16.81 CFM, a little more than the Sunon 25 mm fans, on a ball bearing rated for 70,000 hours at 40 °C. Delta's US page marks it "Active".

Check price at Amazon

For 24 V machines that call for a ball bearing

Delta AFB0624L-A 60x25mm 24V ball bearing fan

Delta AFB0624L-A 60x25mm 24V ball bearing fan
  • Noise: 26.5 dB(A) average and 30.5 dB(A) worst case, microphone 1 m from intake, 3100 RPM (Delta spec sheet)
  • Price: $46.69 at Amazon, checked Nov 12
  • Best for: 24 V machines where a ball bearing is specified

Delta's slow 6025 also comes in 24 V as the AFB0624L-A, and its sheet prints the same "26.5 (MAX. 30.5) dB-A", the same 3100 RPM and the same 16.81 CFM, measured one meter from the intake.

It runs from 14.0 to 27.6 V and draws 1.44 W, half again the 12 V model's 0.96. On the shared 1 m basis it sits 9.8 dB(A) above Sunon's 24 V MF60252V3, which turns at the same speed. Delta's page lists it as "Active".

Check price at Amazon

Three fixed speeds, down to 8.2 dB(A)

Noctua NF-A6x25 FLX

Noctua NF-A6x25 FLX
  • Noise: 19.3 dB(A) bare at 3000 RPM; 14.5 on the L.N.A.; 8.2 on the U.L.N.A. (Noctua infosheet, distance not given)
  • Price: $16.95 at Amazon, checked Nov 12
  • Best for: 12 V boxes where you want to pick a fixed speed once and leave it
  • Skip it if: Your board controls fans by PWM, where the NF-A6x25 PWM fits better

Two adaptors in the box give the NF-A6x25 FLX its range: "19.3 dB(A)" bare at 3000 RPM, 14.5 with the Low-Noise Adaptor at 2400 RPM, and 8.2 with the Ultra-Low-Noise Adaptor at 1600 RPM.

Noctua names no measuring distance, so these rank only against its own fans. At full speed it moves 29.2 m³/h; at the 8.2 dB(A) setting that falls to 16.7 m³/h.

It is a 3-pin, 12 V fan, and a 3:4-pin adaptor and a y-cable come in the box.

Check price at Amazon

Best for a PWM header, 12.1 dB(A) on its adaptor

Noctua NF-A6x25 PWM

Noctua NF-A6x25 PWM
  • Noise: 19.3 dB(A) bare at 3000 RPM; 12.1 dB(A) on the L.N.A. at 2300 RPM (Noctua infosheet, distance not given)
  • Price: $16.95 at Amazon, checked Nov 12
  • Best for: 12 V mini PCs, routers and NAS boxes with a PWM fan header
  • Skip it if: Your device only has a 5 V fan header; Noctua sells 5V versions

The NF-A6x25 PWM lists the same "19.3 dB(A)" at 3000 RPM as the FLX, and 12.1 dB(A) with its Low-Noise Adaptor holding it to 2300 RPM. The adaptor can fix that speed or cap the top of a PWM curve. Noctua gives no measuring distance.

One slip on the infosheet: its opening paragraph says the adaptor takes the fan to 2100 rpm, while its table and adaptor note say 2300, so we quote the table.

Check price at Amazon

Thinnest Noctua, 7.8 dB(A) on its slowest adaptor

Noctua NF-A6x15 FLX slim 60mm fan

Noctua NF-A6x15 FLX slim 60mm fan
  • Noise: 19.8 dB(A) bare at 3500 RPM; 16.5 on the L.N.A.; 7.8 on the U.L.N.A. (Noctua infosheet, distance not given)
  • Price: $16.95 at Amazon, checked Nov 12
  • Best for: Thin 12 V enclosures where 25 mm will not fit
  • Skip it if: A 25 mm frame fits, since the NF-A6x25 lists less at full speed

In a 15 mm frame, the NF-A6x15 FLX lists "19.8 dB(A)" at its 3500 RPM top speed, 16.5 on the Low-Noise Adaptor at 3050 RPM and 7.8 with the Ultra-Low-Noise Adaptor at 2250 RPM.

That 7.8 is the lowest figure Noctua prints for any 60mm fan, though at that setting it moves 14.5 m³/h. Like every Noctua figure here, it comes with no distance, so it ranks only within Noctua. A 4-pin adaptor cable comes in the box.

Check price at Amazon

How to choose

Sunon's V3 pair leads at 16.7 dB(A)

Two Sunon fans tie at the bottom of the list: the 24 V MF60252V3 and the 12 V MF60251V3, both 16.7 dB(A) at 3100 RPM in a 25 mm frame.

Here is every 60mm figure under 27 dB(A) on the shared 1 m basis, each at full rated speed.

FanFrameSupplyNoise at 1 mSpeed
Sunon MF60251V360 x 25 mm12 V16.7 dB(A)3100 RPM
Sunon MF60252V360 x 25 mm24 V16.7 dB(A)3100 RPM
Sunon MF60101V360 x 10 mm12 V20.5 dB(A)3000 RPM
Sunon MF60151V360 x 15 mm12 V21.3 dB(A)3000 RPM
Sunon MF60251V2 and MF60252V260 x 25 mm12 V and 24 V22 dB(A)3800 RPM
Delta EFB0612LA60 x 10 mm12 V24.5 dB(A)3000 RPM
Sunon MF60101V260 x 10 mm12 V25.0 dB(A)3500 RPM
Delta AFB0612L-A and AFB0624L-A60 x 25 mm12 V and 24 V26.5 dB(A)3100 RPM

The two V3 fans share speed, airflow and figure. They part ways at start-up, where the 24 V one needs 8 V and the 12 V one 4.5 V.

Stock decided the rest. On Amazon the 24 V fan was in stock as a two-pack, while the 12 V one appeared only on a listing marked scarce, and that is why the 12 V pick above is the slimmer MF60101V3.

Two makers measure at a meter, one names no distance

Sunon and Delta put the microphone 1 m from the fan intake. Noctua's 60mm infosheets leave the distance out.

Delta and Sunon at 1 m

Delta's 60mm sheets describe the set-up in capitals: "IN FREE AIR IN ANECHOIC CHAMBER WITH B & K SOUND LEVEL METER WITH MICROPHONE AT A DISTANCE OF ONE METER FROM THE FAN INTAKE." They also print a maximum in brackets, 30.5 dB(A) beside the 26.5 average for the AFB0612L-A.

Sunon tests in a semi-anechoic chamber "with background noise level below 15dB(A)" and draws the microphone 1 m from the intake. It prints a single figure and no maximum.

Move the microphone and the comparison breaks, for reasons our guide to comparing decibel ratings sets out.

Noctua leaves the distance out

Each infosheet gives "Max. acoustical noise" at top speed and another figure for every adaptor in the box, with nothing on where the microphone stood. The rest of the Noctua range follows the same pattern, as our Noctua fan decibel page shows.

What is the quietest 24V 60mm fan for a 3D printer?

Sunon's MF60252V3, at 16.7 dB(A) and 3100 RPM on the 1 m basis, from a 25 mm deep frame.

24 V fanFrameNoise at 1 mSpeedAirflow
Sunon MF60252V360 x 25 mm16.7 dB(A)3100 RPM16.0 CFM
Sunon MF60252V260 x 25 mm22 dB(A)3800 RPM19.3 CFM
Delta AFB0624L-A60 x 25 mm26.5 dB(A)3100 RPM16.81 CFM
Sunon MF60252V160 x 25 mm27.0 dB(A)4500 RPM23.5 CFM
Sunon MF60152V260 x 15 mm29.2 dB(A)3900 RPM22.8 CFM
Sunon MF60152V160 x 15 mm34.2 dB(A)4700 RPM26.4 CFM

Sunon's search tool turned up no 60 x 10 mm fan at 24 V, and Noctua offers no 24 V fan of this size that we could find. None of these sheets mentions a printer connector either, so expect to crimp or splice onto the printer's plug. For the printer as a whole, see the guide to the quietest 3D printers.

Check the voltage first

Delta's 24 V AFB0624L-A will not run below 14.0 V. Sunon's 24 V fans start at 8 V.

The 12 V sheets cap their supply at 13.8 V, which makes a 12 V fan the wrong part for a 24 V fan socket however low its figure.

What is the quietest 12V 60mm fan?

On the 1 m basis, Sunon's 25 mm MF60251V3 at 16.7 dB(A) and 3100 RPM, with its 10 mm MF60101V3 next at 20.5.

Where a 25 mm frame fits, the MF60251V3 moves 16.0 CFM on 0.53 W, but we could not find it in stock on Amazon under Sunon's name. That left the 10 mm MF60101V3 and Delta's 25 mm AFB0612L-A, at 26.5, as the 12 V picks. Router, switch and NAS lids often have room only for a thin frame. There the 10 mm Sunon lists 20.5 against 24.5 for Delta's 10 mm EFB0612LA, both at 3000 RPM, and some of these boxes use the smaller fans in our 40mm fan guide instead.

Noctua's order changes once the adaptors go on

Bare, the 25 mm NF-A6x25 lists 19.3 dB(A) at 3000 RPM in every version, and the 15 mm NF-A6x15 lists 19.8 at 3500 RPM.

With the adaptors in the box fitted, the thin fan drops lowest.

Noctua fan and adaptorNoiseSpeedAirflow
NF-A6x15 FLX, U.L.N.A.7.8 dB(A)2250 RPM14.5 m³/h
NF-A6x25 FLX, U.L.N.A.8.2 dB(A)1600 RPM16.7 m³/h
NF-A6x25 PWM, L.N.A.12.1 dB(A)2300 RPM20.9 m³/h
NF-A6x25 FLX, L.N.A.14.5 dB(A)2400 RPM23.5 m³/h
NF-A6x15 PWM or FLX, L.N.A.16.5 dB(A)3050 RPM20.1 m³/h

The 5 V versions, NF-A6x25 5V and 5V PWM and NF-A6x15 5V and 5V PWM, list the same full-speed figures as their 12 V twins. Noctua pitches the slim 5V PWM at "3D printers and network or storage solutions" that run 5 volt fans and packs a USB power cable with it.

Is a 60x25 fan quieter than a 60x15 or 60x10 fan?

Usually, for similar airflow. Sunon's 25 mm MF60251V3 lists 16.7 dB(A) for 16.0 CFM, and its 15 mm MF60151V3 21.3 for 17.6 CFM.

The 10 mm MF60101V3 looks close at 20.5 dB(A) until you see its 12.2 CFM. A thin fan has to spin faster to match a deep one, and Sunon's MF60101V1 reaches 16.3 CFM only at 4000 RPM, where it lists 28.5 dB(A).

Noctua shows a smaller gap: 19.3 dB(A) for 29.2 m³/h at 3000 RPM from the 25 mm NF-A6x25, and 19.8 for 23.4 m³/h at 3500 RPM from the 15 mm NF-A6x15.

Within one family, speed sets the figure

Delta's 25 mm line climbs from 26.5 dB(A) at 3100 RPM to 31.0 at 3600 RPM. Sunon's 25 mm, 24 V line goes 16.7 at 3100, 22 at 3800 and 27.0 at 4500. To slow a fan you already own, see our page on making PC fans quieter.

Fans we found but could not rank

Two Sunon sheets contradict themselves. The HA60251V4 and HA60151V4 print "@ 1M" beside the figure, then draw the microphone 0.1 m from the intake.

The HA60251V4 gives "10.7 dB(A) @ 1M" at 2500 RPM, on a sheet that puts the room's background noise "below 15dB(A)", higher than the figure itself. Its sibling gives 14.5 dB(A) at 2200 RPM above the same 0.1 m drawing. Both appear here as quotes only.

Sunon's older KD and KDE fans, such as the KDE1206PHV2, still sell on Amazon under Sunon's name, yet they did not appear in Sunon's model search and we found no current sheet for them.

Other brands came up empty. WINSINN's and Evercool's DC fan pages showed no 60mm model with a noise figure, and GDSTIME's site refused our request. SANYO DENKI rates its San Ace fans at 1 m, but none of its 60mm models was in stock on Amazon under its own name. The ARCTIC catalog pages we checked list no 60mm model at all.

How the quietest 60mm fans compare

ProductNoiseSizeSupplyAirflowBearingPrice
Sunon MF60252V3-10000-A99 (sold in the US as MF60252V3-1000U-A99)16.7 dB(A), microphone 1 m from intake, 3100 RPM (Sunon spec sheet)60 x 60 x 25 mm24 VDC nominal; operates on 8 to 27.6 VDC16.0 CFM, 0.10 inch H2OMagLev motor on a Vapo bearing$48.98
Sunon MF60101V3-10000-A99 (sold in the US as MF60101V3-1000U-A99)Sunon spec sheet: 20.5 dB(A), microphone 1 m from intake, 3000 RPM60 x 60 x 10 mm12 VDC nominal; operates on 6 to 13.8 VDC12.2 CFM, 0.08 inch H2OMagLev motor on a Vapo bearing$30.06
Delta AFB0612L-A26.5 dB(A) average and 30.5 dB(A) worst case, microphone 1 m from intake, 3100 RPM (Delta spec sheet)60 x 60 x 25.4 mm12 VDC nominal; operates on 4.0 to 13.8 VDC16.81 CFM, 2.86 mmH2OBall bearing$60.00
Delta AFB0624L-A26.5 dB(A) average and 30.5 dB(A) worst case, microphone 1 m from intake, 3100 RPM (Delta spec sheet)60 x 60 x 25.4 mm24 VDC nominal; operates on 14.0 to 27.6 VDC16.81 CFM, 2.86 mmH2OBall bearing$46.69
Noctua NF-A6x25 FLX19.3 dB(A) bare at 3000 RPM; 14.5 on the L.N.A.; 8.2 on the U.L.N.A. (Noctua infosheet, distance not given)60 x 60 x 25 mm12 V, 0.96 W29.2 m³/h, 2.18 mmH2O at full speedSSO2 bearing$16.95
Noctua NF-A6x25 PWM19.3 dB(A) bare at 3000 RPM; 12.1 dB(A) on the L.N.A. at 2300 RPM (Noctua infosheet, distance not given)60 x 60 x 25 mm12 V, 0.96 W29.2 m³/h, 2.18 mmH2O; 20.9 m³/h with L.N.A.SSO2 bearing$16.95
Noctua NF-A6x15 FLX19.8 dB(A) bare at 3500 RPM; 16.5 on the L.N.A.; 7.8 on the U.L.N.A. (Noctua infosheet, distance not given)60 x 60 x 15 mm12 V, 1.02 W23.4 m³/h, 2.43 mmH2O at full speedSSO2 bearing$16.95

Prices as of Nov 12. Product prices and availability are accurate as of the date/time indicated and are subject to change.

Frequently asked questions

What is the quietest 60mm fan?

Measured a meter from the intake, as both Sunon and Delta do, Sunon's MF60252V3 (24 V) and MF60251V3 (12 V), both at 16.7 dB(A) and 3100 RPM. Noctua's NF-A6x25 lists 19.3 dB(A) but names no distance, which keeps it in a Noctua-only ranking.

What is the quietest 24V 60mm fan?

Sunon's MF60252V3, at 16.7 dB(A) measured 1 m from the intake, followed by Sunon's MF60252V2 at 22 and Delta's AFB0624L-A at 26.5. Noctua makes no 24 V 60mm fan that we could find.

What is the quietest 12V 60mm fan?

With the microphone a meter away, Sunon's 25 mm MF60251V3 at 16.7 dB(A), then its 10 mm MF60101V3 at 20.5. Among Noctua's own figures, the NF-A6x25 PWM and FLX list 19.3 dB(A) at full speed.

Does Noctua make a 24V 60mm fan?

Not that we could find. Noctua's 60mm infosheets cover 12 V and 5 V versions of the NF-A6x25 and NF-A6x15, and no 24V 60mm infosheet or product page turned up. For a 24 V printer, the Sunon and Delta fans here run on 24 V directly.

Is a 60x25 fan quieter than a 60x15 or 60x10?

Often, for the same air. Sunon's 25 mm MF60251V3 lists 16.7 dB(A) for 16.0 CFM at 3100 RPM, while its 15 mm MF60151V3 lists 21.3 for 17.6 CFM and its 10 mm MF60101V3 20.5 for 12.2 CFM, both at 3000 RPM.

The bottom line

Sunon has this size sewn up. A 16.7 dB(A) figure at a full meter, on a 24 V fan that starts at 8 V, is exactly what a printer bay wants. Noctua, the name most people reach for, makes no 24 V fan here.

Check airflow before you swap anything. The MF60252V3 moves 16 CFM, so hold that against whatever the stock 6025 fan moved. On a 12 V router or mini PC with a PWM header, the NF-A6x25 PWM is the plug-in choice. Just do not set its 19.3 dB(A) against Sunon's numbers.

Stanley Alu, founder and editor

What we also considered

These are worth knowing about, and why they didn't make the list.

  • Sunon MF60251V3 60x25mm 12V MagLev fan

    The 12 V twin of the MF60252V3, at 16.7 dB(A), 3100 RPM and 1 m, the lowest 12 V figure on that basis; its only Sunon listing on Amazon was marked scarce rather than in stock.

    Search Amazon for this model

  • Sunon MF60152V2 60x15mm 24V MagLev fan

    The slowest 24 V Sunon in a 15 mm frame, at 29.2 dB(A) and 3900 RPM on the 1 m basis, with 22.8 CFM.

    See it at Amazon

  • Sunon MF60251V1 60x25mm 12V MagLev fan

    A faster 12 V 25 mm Sunon, 27.0 dB(A) at 4500 RPM and 1 m, for 23.5 CFM.

    See it at Amazon

  • Delta EFB0612LA 60x10mm 12V ball bearing fan

    Delta's 10 mm, 12 V fan lists 24.5 dB(A) at 3000 RPM and 1 m, 4.0 above Sunon's MF60101V3; on Amazon it comes only as a five-pack.

    See it at Amazon

  • Sunon HA60251V4 60x25mm 12V MagLev fan

    Sunon prints 10.7 dB(A) "@ 1M" at 2500 RPM, but the test drawing on that sheet places the microphone a tenth of a meter from the fan, which leaves the number unranked here.

    See it at Amazon

  • Noctua NF-A6x25 5V PWM

    Noctua's 5 V PWM version of the NF-A6x25 lists 19.3 dB(A) at full speed, distance unstated; Noctua made it for replacing 5 V fans with an OmniJoin adaptor set.

    See it at Amazon

  • Noctua NF-A6x15 5V PWM slim 60mm fan

    The slim 5 V PWM model, 19.8 dB(A) at 3500 RPM, with a USB power cable in the box.

    See it at Amazon

  • Noctua NF-A6x15 PWM slim 60mm fan

    The 4-pin 12 V NF-A6x15, 19.8 dB(A) or 16.5 with its adaptor; we could not find it on Amazon under its own model name.

    Search Amazon for this model

How we reviewed this article

Every statement here comes from the 33 maker documents, standards and agency pages listed under Sources, quoted where the wording matters. We did not measure, inspect or repair anything ourselves. Each substantive revision is dated below. How we work

  1. Current version

    First published, written by Stanley Alu.

Sources

All 33 sources
Manufacturer pages and manuals for every product

Related guides

Quietest 40mm fan: Sunon's HA40101V4 lists 15.7 dB(A) at one meter

Sunon's HA40101V4 lists 15.7 dB(A) and Delta's AFB0412LA-A 16.0, both measured 1 m from the intake. For 24 V printers, Sunon's 20 mm MF40202V2 lists 21.0 on that basis. Noctua's NF-A4x20 PWM lists 14.9 and its 24V NF-A4x10 19.6, with no distance given, so they rank apart.

Quietest 80mm fan: Noctua's NF-R8 redux-1200 lists 9.1 dB(A) at 1200 RPM

Noctua's slowest 80mm fan prints 9.1 dB(A) and its NF-A8 ULN 6.5 with the adaptor. be quiet! lists 18.2 and 19.2 at 1900 rpm, Thermalright 23.3 and 24 at 2200 RPM, and ARCTIC rates its P8 fans in sone. Each figure is ranked only beside the same maker's other 80mm fans.

The quietest 3D printers

The quietest 3D printer with a published maker figure lists up to 44 dB in quiet mode, measured at 1 meter. Most makers publish a silent mode number and two name the measuring distance. Enclosed and open frame picks, and why a heated chamber can add 7 dB.