Dual 170HX · 120 mm duct

ARCTIC P12 Pro PST CO · V23 · 38.5 × 98.5 mm fit · 1 intake fan @ 2500 rpm

V23 · rounded upper shoulders

DuctGPUsPower cablesExhaust collectorCase rearSlot screws

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Actual V23 duct STL · photo-informed hardware approximation
Upper shoulder blends · rounded splitter · hollow shell

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Inspect the model

Explode assembly 0 mm

Outlet center pitch 60.96 mm

Duct length 70 mm

Full cards are shown with the nominal 267 mm length and your measured 38.4 × 98 mm casing. Vents, fins, plug and cable geometry remain photo-informed approximations. There are no separate green seals: the marked outer and top connector rims have been removed. The lower and inner returns now have ramped undersides; local latch clearance remains. Estimated plug/latch insertion envelopes are clear in CAD; physical fit and airtightness are untested.

Airflow · CFD field

Live air particles

Colour by

Particles 10k

Trail length 24 frames

Slow motion ×0.05

Section planes

Cross-section (z plane)

Plane position 35 mm

Lengthwise plane through GPU A (x = −30.5 mm)

CFD analysis

Loss hotspots · click to fly there

Steady RANS field: no fan swirl, no turbulence, no time history. Fin banks (and the bracket grille, when modelled) are porous zones, so particles cross them as a smoothed, superficial-velocity flow, not channel by channel. Fans are pressure boundaries or disks, not rotating blades.

Fan setup · live estimate

Intake fan speed 2500 rpm

Intake fans

Push-pull · exhaust fan on a collector

Exhaust fan speed 2500 rpm

Collector loss · velocity heads 3.0

Power per card 250 W

Flow–System pressure drop–Modeled peak base rise–vs 1 fan @2500–Noise vs 1 fan @2500 · rule of thumb–

Fan pressureSystem curveOperating point

Lumped network (duct estimate): ARCTIC P12 Pro chart scaled by the affinity laws, total pressure = static + ½ρ(Q/A)² once, stacked fans at 70 % of the ideal pressure gain, exhaust fan on its static curve plus the collector loss. System curve and rise fit are calibrated on three accepted CFD runs (2000/2500/3000 rpm, 9.3–15.5 L/s).

Peak base rise is the modeled heat-spreader base above intake air, not a GPU or HBM temperature. Noise is a speed-law rule of thumb, not P12 Pro acoustic data.

Dimensions · mm

Fan frame120 × 120 × 25Duct mounting plate120 × 120 × 2.4Fan screw pitch105 × 105Chamber depth70Fitting collars12Collar interior*38.5 × 98.5Outlet center pitch60.96Print depth · incl. collars82Passage blend radius6–8Main shell · nominal1.6–1.7Fan front → card face95Splitter nose front edge0.4Splitter profileRounded / cubicCard length · nominal267Power openingOpen outer/top; latch relief retainedCollar wall1.6

V23 also blends the marked upper shoulders into the passage roofs. The requested 6 mm radius is constrained locally and tapers to 1.5 mm near the GPU face, keeping the modeled fin openings clear. The earlier lower 6–8 mm blends remain. The local changes add 0.44 cm³ of material versus V22; nominal shell and collar dimensions remain. P1S/PETG: 196 min / 99.8 g. A controlled radius sweep is running; 6 mm is not an established airflow optimum.

Download V23 STL ↓
10 mm collar fit gauges ↓
Print & connector fitting notes →
Geometry and print checks (JSON) →
ARCTIC fan drawings & pressure curve ↗