Dual 170HX · 120 mm duct

ARCTIC P12 Pro PST CO · V27 · 38.5 × 98.5 mm fit · push-pull · intake + exhaust fan @ 2500 rpm

V27 · push-pull · collector v1

DuctGPUsPower cablesExhaust collectorCase rearSlot screws

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Actual V27 duct STL + collector v1 STL · photo-informed hardware approximation
Rounded skin to the seat · chamfered seat frame · no wedges

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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 · nominal1.2Fan front → card face95Splitter nose front edge0.4Splitter profileRounded / cubicCard length · nominal267Power openingOpen outer/top; latch relief retainedCollar wall1.2

V27 lets the outer skin follow the rounded bay corners all the way to the GPU seat, so the 1.2 mm wall no longer thickens into solid wedges beside the power-plug pockets. The square connector returns are replaced by a small seat frame (collar footprint and pocket-floor lip) whose underside grows out of the rounded shell at 40 degrees: it prints without support, leaves no cavity, and the slicer adds 0 g of support (V25: 1.75 g under the latch-wall tips). Air passage, bores, collars, plate and plug/latch clearance are unchanged from V25. P1S/PETG: 154 min / 73.3 g.

Download V27 STL ↓
10 mm collar fit gauges ↓
Print & connector fitting notes →
Geometry and print checks (JSON) →
ARCTIC fan drawings & pressure curve ↗