# 140 mm fan evaluation: noise, static pressure, airflow, and the top 10 recommendations

// 01 · Top 10

## Top 10 picks

The ranking answers one question: If buying in Japan now for close-range use, seeking quiet operation with both static pressure and airflow, which model should you try first? Four factors are considered in order:

1. Evidence: Are there independent noise-normalized measurements on the same test platform (Cybenetics, Tweakers, HWCooling)? Models with only manufacturer specifications do not enter the top 10.
2. Performance at quiet settings: Airflow and static pressure at 20/25 dBA, followed by obstructed-airflow tests with radiators or filters.
3. Availability and price in Japan: Tax-inclusive in-stock prices, scheduled launches, or discontinued sales; unavailable models rank lower.
4. Installation and usage requirements: Thickness, proprietary controllers, and warranty service contacts in Japan.

This is an editorial judgment, not a total score obtained by multiplying CFM, mmH₂O, and dBA. Adjacent models often differ by less than the measurement uncertainty. First narrow the field with the scenario table, then return here to compare.

1. 01

   No. 1:ARCTIC P14 Pro PST

   Best overall · Value for money · High static pressure · 27 mm

   Cybenetics 25 dBA

   61.61 CFM／2.72 mmH₂O

   Cybenetics 20 dBA (database)

   53.69 CFM／2.10 mmH₂O

   Tweakers 25／20 dBA

   74.57／57.87 m³/h

   Japanese prices

   ¥1,590 (Bic, free shipping); Tsukumo ¥1,449 + shipping

   Thickness

   27 mm

   Why

   At the same 25 dBA, its shut-off static pressure of 2.72 mmH₂O is 1.68 times G2’s, while airflow is 84% of G2’s. In HWCooling’s noise-normalized thin-radiator tests it leads airflow at 31 and 36 dBA, trading wins with T30-140; Tweakers points in the same direction. The delivered price per fan is about one-third of G2’s, making it especially cost-effective in multi-fan setups.

   Watch out for

   At 27 mm thick, measure the available space before installation. At an extremely quiet 20 dBA, its free airflow ranks in the lower middle of Tweakers’ results; static pressure is its strength. It was louder on HWCooling’s test grille. Cybenetics measured about 0.40 A under shut-off conditions, above the official 0.35 A; leave power headroom when daisy-chaining multiple fans.

   Best for: Resistive locations such as filters, radiators, and external fan boxes; multiple fans on a limited budget.

   • Cybenetics
   • Tweakers
   • HWCooling
   • In stock in Japan

   Sources S06 S10 S14 S96 S20 S65 S64 · Full specifications

2. 02

   No. 2:Noctua NF-A14x25 G2 PWM

   Top pick for low-noise airflow · Premium · 25 mm

   Cybenetics 25 dBA

   73.31 CFM／1.62 mmH₂O

   Cybenetics 20 dBA (database)

   60.09 CFM／1.10 mmH₂O

   Tweakers 25／20 dBA

   86.22／74.87 m³/h

   Japanese prices

   ¥4,720 (Tsukumo, single); Sx2-PP twin pack ¥8,481

   Thickness

   25 mm

   Why

   It leads free airflow at both 20 and 25 dBA on two platforms. Standard 25 mm thickness; 300 rpm at 20% PWM and stops at 0%, giving a broad low-speed adjustment range. HWCooling finds it generally excels at low resistance and performs very well with a nylon filter.

   Watch out for

   It costs about 3 times as much as P14 Pro PST. Shut-off static pressure is not its strength: HWCooling measured about 1–15% less noise-normalized thin-radiator airflow than T30, the P14 Pro series, and TOUGHFAN, with the gap widening at quieter settings. Japanese distributor-channel warranty is 2 years (manufacturer states 6 years); confirm the service route for years 3–6 separately. HWCooling’s plastic filter did not suit it, and some speeds may still produce tones or frame vibration.

   Best for: Quiet close-range use, low to medium resistance, and minimal time spent tuning fan curves; use Sx2-PP for side-by-side pairs to reduce beating.

   • Cybenetics
   • Tweakers
   • HWCooling
   • In stock in Japan

   Sources S01 S09 S13 S96 S18 S60 S61 · Full specifications

3. 03

   No. 3:ARCTIC P14 Pro A-RGB

   Top pick with lighting · High static pressure · 27 mm

   Cybenetics 25 dBA

   62.42 CFM／2.86 mmH₂O

   Cybenetics 20 dBA (database)

   54.34 CFM／2.14 mmH₂O

   Japanese prices

   ¥2,326 (Tsukumo; ¥550 shipping when bought alone)

   Thickness

   27 mm

   Why

   Its 25 dBA results on the same platform are in the same class as P14 Pro PST, with differences within measurement uncertainty. Shut-off static pressure of 2.86 mmH₂O is the highest of the 11 models. In stock in Japan.

   Watch out for

   Lighting and price are the main differences from No. 1; PWM control works normally without connecting ARGB. LEDs separately draw 5 V, 0.40 A. P14 Pro Reverse A-RGB has different blades, so its data cannot be substituted.

   Best for: A windowed case where you want lighting without sacrificing static pressure.

   • Cybenetics
   • In stock in Japan

   Sources S05 S56 S57 S66 · Full specifications

4. 04

   No. 4:Thermaltake TOUGHFAN 14 Pro

   25 mm radiator option · Mid-priced · Inspect on arrival

   Tweakers 25／20 dBA

   80.86／71.31 m³/h

   Japanese prices

   ¥3,418 (Sofmap, free shipping); Bic ¥3,760

   Thickness

   25 mm

   Why

   Tweakers places its free airflow second only to G2 at 25 dBA and third at 20 dBA. In HWCooling’s noise-normalized thin-radiator tests it belongs in the same group as T30 and the P14 Pro series, clearly above G2. 25 mm thick, with a 5-year manufacturer warranty.

   Watch out for

   HWCooling found sample variation: most were very quiet, but some clicked noticeably in certain orientations. Listen at low speed in the intended orientation after delivery. Tweakers measured relatively low shut-off static pressure; there is no Cybenetics data. Do not confuse it with EX14 Pro, which has interchangeable blades.

   Best for: Radiators with room for only 25 mm, with a budget between P14 Pro and G2.

   • Tweakers
   • HWCooling
   • In stock in Japan

   Sources S09 S96 S97 S36 S102 S98 · Full specifications

5. 05

   No. 5:Corsair RS140 MAX

   High airflow at low resistance · 30 mm

   Cybenetics 25 dBA

   68.65 CFM／1.10 mmH₂O

   Cybenetics 20 dBA (database)

   57.10 CFM／0.79 mmH₂O

   Tweakers 25／20 dBA

   78.31／73.24 m³/h

   Japanese prices

   ¥4,123 (Tsukumo, free shipping)

   Thickness

   30 mm

   Why

   Cybenetics measured 68.65 CFM of free airflow at 25 dBA, third among 11 models. Tweakers’ 73.24 m³/h at 20 dBA is close to G2’s 74.87. Standard 4-pin PWM.

   Watch out for

   Its shut-off static pressure is among the lowest in the same-platform group (1.10 mmH₂O), making it unsuitable for dense filters or thick radiators. It is 30 mm thick. The name is easily confused with RS140 and RS140 II. The Japanese distributor lists the twin pack as discontinued; verify the single pack separately.

   Best for: Large front intake openings, no filter or a sparse grille, and high airflow at low noise.

   • Cybenetics
   • Tweakers
   • In stock in Japan

   Sources S02 S09 S29 S30 S68 · Full specifications

6. 06

   No. 6:ARCTIC BioniX P14 A-RGB

   ARGB with tidy cabling · High static pressure · 28 mm · Launches 10/23

   Cybenetics 25 dBA

   64.44 CFM／2.81 mmH₂O

   Cybenetics 20 dBA (database)

   52.98 CFM／2.05 mmH₂O

   Japanese prices

   Estimated ¥2,480 (single) / ¥6,580 (three-pack)

   Thickness

   28 mm

   Why

   Its 25 dBA figures are in the same class as the P14 Pro series. HWCooling already has independent obstacle and acoustic tests. Bridge Modules connect the frames for easier cable management.

   Watch out for

   Japanese launch is scheduled for 2026-10-23; the price is the distributor’s estimate. It is 28 mm thick. The official site gives two minimum speeds, 400 and 450 rpm. Bridge Cable is included only with the three-pack. HWCooling’s test grille produced a peak around 340 Hz. Do not confuse it with the older BioniX P140.

   Best for: Lighting and tidy wiring, if you can wait for launch.

   • Cybenetics
   • HWCooling
   • Scheduled launch

   Sources S03 S15 S22 S71 S94 · Full specifications

7. 07

   No. 7:Phanteks T30-140

   Radiator performance ceiling · 30 mm · Japanese availability unconfirmed

   HWCooling thin radiator

   Top airflow at 33/39 dBA: 52.09/63.38 m³/h

   Japanese prices

   Not found at major Japanese retailers; Amazon.co.jp third-party seller ¥10,088 (not identified as an authorized distributor)

   Thickness

   30 mm

   Why

   In HWCooling’s obstructed tests, it leads thin-radiator airflow at 33, 39, and 42 dBA and at full speed, as well as nylon-filter airflow at 33 dBA. Its lead over P14 Pro and TOUGHFAN is only a few percentage points; at 31 and 33 dBA it moves about 15% more air than G2. Three official modes (Advanced/Performance/Hybrid), with a 6-year warranty.

   Watch out for

   30 mm thick, drawing up to 0.56 A per fan. The test grille produced a 360 Hz tone around 700 rpm, with more pronounced vibration above roughly 1100 rpm. No noise-normalized figures from Cybenetics or Tweakers. Major Japanese retailers do not list it; third-party sellers charge about six times P14 Pro PST’s price, and warranty service is unclear.

   Best for: Enough space, radiator or filter performance as the priority, and willingness to source it yourself.

   • HWCooling
   • Japanese retail availability unconfirmed

   Sources S12 S96 S16 S17 S73 S101 · Full specifications

8. 08

   No. 8:be quiet! Silent Wings Pro 4 140mm PWM

   25 mm · Interchangeable mounting corners · 5-year Japanese warranty

   Cybenetics 25 dBA

   57.89 CFM／1.30 mmH₂O

   Cybenetics 20 dBA (database)

   50.55 CFM／1.02 mmH₂O

   Tweakers 25/20 dBA (Medium mode)

   72.83／63.59 m³/h

   Japanese prices

   ¥4,309 (Sofmap, free shipping)

   Thickness

   25 mm

   Why

   25 mm, a three-position maximum-speed switch, interchangeable case/radiator mounting corners, and a 5-year Japanese retail-channel warranty. Both platforms have noise-normalized measurements; its figures sit in the lower middle, steady but not outstanding.

   Watch out for

   Neither noise-normalized airflow nor static pressure leads, yet the price approaches G2’s. The minimum continuous speed and PWM stop threshold are not published.

   Best for: Systems prioritizing mounting flexibility, Japanese warranty support, and a consistent appearance.

   • Cybenetics
   • Tweakers
   • In stock in Japan

   Sources S07 S09 S26 S27 S67 · Full specifications

9. 09

   No. 9:Lian Li UNI FAN AL140 V2

   25 mm ARGB · Frame-to-frame connection · Good noise-normalized static pressure

   Tweakers 25／20 dBA

   74.35／60.20 m³/h

   Japanese prices

   ¥4,660 (Sofmap, black, while stocks last)

   Thickness

   25 mm

   Why

   Tweakers measured shut-off static pressure of 1.32 mmH₂O at 25 dBA, second only to P14 Pro PST, with airflow also in the leading group. At 25 mm thick, the single pack connects directly to motherboard 4-pin PWM and ARGB headers.

   Watch out for

   Only Tweakers provides noise-normalized data. Warranty is 2 years, and some Japanese retailers already mark it discontinued, with limited remaining stock. The official Input Power of 6.32 W does not separate motor and LEDs. AL120 V2 is 28 mm thick; do not mix up the dimensions.

   Best for: ARGB with room for only 25 mm, without adding a controller.

   • Tweakers
   • Japan status to be confirmed

   Sources S09 S38 S99 · Full specifications

10. 10

    No. 10:Lian Li UNI FAN TL 140

    Strong noise-normalized airflow · Proprietary controller required · 144 mm outer width

    Cybenetics 25 dBA

    70.70 CFM／1.25 mmH₂O

    Cybenetics 20 dBA (database)

    58.97 CFM／0.93 mmH₂O

    Japanese prices

    ¥5,480 (Tsukumo, white, clearance price)

    Thickness

    28 mm

    Why

    Cybenetics measured 70.70 CFM of free airflow at 25 dBA, second only to G2 among the 11 models, and it also ranks second at 20 dBA (database). The original report omitted this same-platform data; it entered the ranking only after this site added it.

    Watch out for

    Requires a compatible TL controller (with separate power and internal USB), not included in the 140 mm single pack. Frame dimensions are 144 × 140 × 28 mm, with a 3-year warranty. Clearance has started in Japan; later, only TL Wireless may remain (also requires a controller). This is not TL LCD.

    Best for: Already using the Lian Li controller ecosystem, with a case that accommodates the 144 mm frame.

    • Cybenetics
    • Controller required

    Sources S90 S87 S39 S100 · Full specifications

Not selected, but worth knowing

• ARCTIC P14 Max: Cybenetics 25 dBA gives 63.91 CFM/1.70 mmH₂O, and Tweakers 25 dBA airflow is 78.57 m³/h—respectable figures, but the Japanese distributor lists it as discontinued. Keep using one you already own; for a new purchase, look for P14 Pro first.[S04 S09 S76]
• ARCTIC P14 Pro PST CO: Dual ball bearings, marketed for continuous operation. Tweakers measured 51.17 m³/h at 20 dBA, below the standard FDB version’s 57.87. The CO name earns no extra credit when quietness is the priority.[S10 S54]
• Noctua NF-A14x25 G2 LS-PWM: Up to 800 rpm, manufacturer-rated 11.4 dBA. Maximum airflow is only 48.03 CFM, suited to near-silent, low-load locations.[S53]
• Noctua NF-A14x25r G2 (round frame): Cybenetics 25 dBA gives 74.35 CFM/1.64 mmH₂O, slightly above the square-frame version, but its 138 mm round frame and 105 mm mounting-hole spacing cannot seal a square radiator mount.[S92 S85]
• Sudokoo MACH140: In stock in Japan at ¥5,080, with manufacturer-rated static pressure of 5.91 mmH₂O. Without noise-normalized loaded measurements, the specifications cannot establish it as the quietest option.[S58 S70]
• be quiet! Silent Wings 4 140 HS: Mid-pack at 25 dBA in Tweakers, but only 47.86 CFM/0.89 mmH₂O at 25 dBA in Cybenetics; the two platforms disagree.[S09 S89]
• MEGACOOL 140、industrialPPC-3000、Shark Force 140: Very high maximum output, but MEGACOOL delivers only 56.92 CFM/0.60 mmH₂O at 25 dBA. Useful as an upper-limit reference, not the first choice for quiet operation.[S44 S59 S41]

// 02 · Choose by scenario

## Quick picks by scenario

The same fan performs differently under different resistance. Find your scenario first, then look at the suggested first candidate and alternatives.

// 03 · Metrics

## Understand the metrics before choosing

1. Intake grille/filterUses up some pressure first; too close to the blades, it also increases noise.
2. FanProvides airflow and pressure differential at a given speed according to its P–Q curve.
3. Radiator/heat sourceHigher resistance moves the operating point toward lower airflow and higher pressure differential.
4. OutletThe flow here actually removes heat—not the free-airflow figure printed on the box.

Conversions: 1 CFM = 1.69901 m³/h; 1 mmH₂O = 9.80665 Pa. Manufacturer airflow, static pressure, and noise are usually measured under different conditions. Do not turn CFM × mmH₂O ÷ dBA into a total score: dBA is logarithmic, and the two aerodynamic maxima do not occur simultaneously.

The resistance of a case, radiator, and filter can be plotted as a system curve. Its intersection with the fan’s P–Q curve is the actual operating point (see P–Q and operating points). This note therefore prioritizes same-platform measurements; manufacturer specifications serve only to check limits, dimensions, and electrical compatibility.[S95 S08]

// 04 · Noise-normalized measurements

## At the same 25 dBA: the key figures that can truly be compared side by side

Cybenetics first finds the speed that produces 25 dBA in a semi-anechoic chamber (about 6 dBA background noise, microphone at a perpendicular distance of 1 m and 30–45° to the horizontal axis), then measures airflow and shut-off static pressure in the same Long Win LW-9266 wind tunnel. This measures aerodynamic capability at equal noise, not “still 25 dBA with a radiator installed,” and these are not measurements performed by this site.[S08]

The original report included only 7 models. This site rechecked the same laboratory’s data and added reports for UNI FAN TL 140, MEGACOOL, P14 PWM PST, and Silent Wings 4 140 HS, bringing the total to 11.[S87 S88 S89 S90 S44]

The cost of maximum output: extrema from the same laboratory

High-output fans can be very quiet at low speed, but full speed still carries a noise cost. Maximum static pressure sometimes occurs at 90% rather than 100%, so these extrema are not treated as one full-speed condition. Maximum speed comes from Section D and differs from measured loaded speeds in the P–Q sweep. The chart’s range lines are expanded uncertainty (k=2) calculated using the source formula; they do not represent retail sample variation or failure rates. This note has not used overlapping intervals for formal significance testing.[S01 S02 S03 S04 S05 S06 S07 S08]

// 05 · Cross-check

## Another measurement system supports the main trend, but absolute values must not be mixed

Tweakers measures noise 50 cm from the intake side (about 12 dBA room background, consistent measurement floor of 14 dBA). It measures airflow with an open 1.5 m-long, 15 cm-inner-diameter duct and static pressure with the duct closed. Its method differs from Cybenetics, so this table compares only within the same platform and cross-checks a quieter 20 dBA setting. P14 Pro/CO come from a later article on the same platform. Silent Wings Pro 4 is in Medium mode here, not the UHS mode in the previous section.[S11 S09 S10]

• At 25 dBA, G2’s airflow of 86.22 m³/h is 15.6% higher than P14 Pro’s 74.57; P14 Pro’s static pressure of 1.44 is 75.6% higher than G2’s 0.82. This matches Cybenetics’ direction.
• At 20 dBA, RS140 MAX’s 73.24 m³/h approaches G2’s 74.87. P14 Pro’s airflow falls to the lower middle, while static pressure remains first. Check this column for extremely quiet settings.
• P14 Pro PST CO (dual ball bearing) does not excel at low-noise test points. Choose the standard FDB version first if quietness is the priority.
• An example of disagreement: Silent Wings 4 140 HS is mid-pack at 25 dBA in Tweakers, but lowest among 11 models at 25 dBA in Cybenetics (47.86 CFM/0.89 mmH₂O). With conflicting conclusions, this note excludes it from the top 10.

For the same G2, the manufacturer specifies maximum noise of 24.8 dBA, Cybenetics measures a maximum of 32.4 dBA, and Tweakers measures 43.1 dBA at full speed. Environments, distances, angles, and methods differ. Subtracting these values cannot establish inflated specifications, and manufacturer dBA figures from different brands are not a fair comparison.[S18 S01 S09]

// 06 · Radiators and filters

## Who has stronger evidence with a real filter or radiator installed?

HWCooling tests with nylon filters, plastic filters, grilles, and thin/thick radiators, retuning to the target noise level for each obstacle. Its 31–45 dBA scale is a dedicated reference using a 15 cm distance and a parabolic sensitivity-enhancing reflector; it is not desk-distance noise.[S73 S74]

This table best illustrates differences in overcoming radiator resistance quietly: T30-140, the P14 Pro series, and TOUGHFAN 14 Pro trade wins within a few percentage points. G2 trails by about 10–15% at 31 dBA; the gap narrows to 1–3% only at 39 dBA.[S96]

The thin radiator is EK CoolStream SE 140 (28 mm, 22 FPI); the thick one is Alphacool NexXxoS XT45 v2 (45 mm, more widely spaced fins). In HWCooling’s data, airflow through the thick radiator is about 5–15% lower than through the thin one. Both thickness and fin density affect resistance; neither should be considered alone.[S74]

// 07 · Cost and supply

## Japanese prices: consider delivered cost and sales-channel status

The following retail pages and announcements were read on 2026-10-10 (Japan time). Prices are in yen including tax; no checkout was completed, and these are not claimed to be Japan’s lowest prices. Points are not treated as cash discounts. Free shipping refers to standard delivery; remote islands and other exceptions follow retailer policies.

BioniX P14 A-RGB has not launched in Japan yet. The distributor announces Friday, 2026-10-23, with black/white singles at ¥2,480 and three-packs at ¥6,580 (about ¥2,193 per fan). These are estimated market prices, not in-stock quotes. No reliable in-stock price from a major Japanese retailer was found for EX14 Pro or some Phanteks models in this survey.[S71 S75 S76]

The cheapest retailer changes between single and multi-fan purchases

Availability and model-name pitfalls

• All prices are observations from tax-inclusive pages; no checkout, purchase, or stock reservation was made. Bic Camera and Yodobashi rejected connections during this site’s recheck, so the two Bic prices were checked against retailer listings on a price-comparison site, with matching figures.
• Tsukumo: ¥550 shipping below ¥3,300 including tax (also for remote islands), with another ¥550 for cash on delivery; some items are excluded from free shipping. Sofmap’s P14 Pro PST price and shipping rules match Tsukumo’s, but free shipping excludes Hokkaido and some remote areas.
• Thermaltake TOUGHFAN 14 Pro: both Sofmap and Tsukumo charge ¥3,418, ¥342 below the original report’s Bic price of ¥3,760. This is not TOUGHFAN EX14 Pro.[S98]
• Phanteks T30-140: not listed by Tsukumo, Ark, Dospara, PC Koubou, or Sofmap. Amazon.co.jp has only third-party sellers (single ¥10,088, three-pack ¥26,501), with no authorized-distributor indication, so it is excluded from the main table.[S101]
• Lian Li UNI FAN AL140 V2: Sofmap black ¥4,660 (while stocks last), white ¥4,780; Tsukumo out of stock, Ark marked discontinued.[S99]
• Lian Li UNI FAN TL 140: Tsukumo white ¥5,480, marked clearance and while stocks last. The older TL 140 is 144 × 140 × 28 mm; the single pack lacks a compatible controller, and the official documentation says it cannot run without one. TL Wireless is 142 × 140 × 28 mm, and its 140 mm single pack also requires a separately purchased controller.[S100 S39]
• be quiet! Silent Wings 4 140 HS (BL097): Amazon.co.jp direct sales in stock at ¥4,020; Sofmap ¥3,980 in limited quantities; PC Koubou ¥3,980 + ¥660 shipping (ships about two weeks after order); Tsukumo ¥3,280, out of stock.
• Corsair RS140 MAX: Tsukumo marks the twin pack (¥8,500) as discontinued; singles remain in stock. Corsair RS140 (first generation, CO-9050190-WW): Tsukumo ¥2,180 but out of stock. It is neither RS140 MAX nor the 2026 RS140 II.
• ARCTIC P14 Max: Japanese distributor Scythe lists both black and white as discontinued; Ark marks them discontinued too. This is the Japanese distributor’s supply status, not proof of worldwide discontinuation. Phanteks D30-140 was found only in a cross-border preorder listing (about ¥30,600 for 3), with insufficient sourcing and warranty information.

// 08 · Value

## How to judge value: separate capability, noise, and cost

At single-fan prices, P14 Pro PST offers about 2.5 times G2’s free airflow per purchase cost. But if one mounting position must move more air at fixed noise, G2’s airflow headroom still has value. With enough space, more inexpensive fans can increase cross-sectional area, but total noise, actual resistance, and power must be reassessed. You cannot simply add single-fan airflow figures at 25 dBA and claim the result is equally quiet.

Suggested evaluation order

1. Eliminate options that will not fit, connect, or can’t be bought: Frame thickness, mounting-hole spacing, controllers, and authorized supply are hard requirements.
2. Then compare airflow at equal noise with the same obstacle: Without obstructed-airflow data, endpoints are only screening clues, not radiator conclusions.
3. Check low-speed sound character and resonance: High-pitched tones, beating, and enclosure vibration often affect use more than a few CFM of difference.
4. Compare total ownership cost: Delivered price, hubs, spacers, controllers, replaceability, and warranty service in Japan.

// 09 · Mechanisms and curves

## Why high static pressure does not guarantee radiator performance: a real P–Q curve

Take the original P14 Pro PST sweep at 50% PWM (about 1355–1356 rpm): it establishes 2.30 mmH₂O at shut-off and about 55.97 CFM at the open end. The middle is the region where it may operate once an airflow path is installed. This is not 25 dBA data.[S06]

For the same fan under approximately similar conditions, airflow is roughly proportional to speed n and pressure to n². Halving speed leaves only about one-quarter of the pressure capability, so even high-pressure fans have limits at low speed.[S72]

Laboratory P–Q curves for 8 models

The charts below share the same axes (0–150 CFM, 0–6 mmH₂O), allowing direct shape comparison. P14 Pro series and BioniX curves rise high on the left (high pressure), while G2 and RS140 MAX extend farther right (high airflow). Fixed PWM does not mean fixed noise; return to noise-normalized data when comparing models. Only adjacent measurement points are connected, without smoothing or extrapolation.[S01 S02 S03 S04 S05 S06 S07 S44]