Dual 170HX · 120 mm duct

ARCTIC P12 Pro PST CO · V28 · 38.5 × 98.5 mm fit · push-pull · intake + exhaust fan @ 2500 rpm

V28 · push-pull · collector v3

DuctGPUsPower cablesExhaust collectorCase rearSlot screws

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Actual V28 duct STL + collector v3 STL · photo-informed hardware approximation
Sealed card face beside the plug pockets · 62 mm fan-to-GPU · support-free

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Inspect the model

Explode assembly 0 mm

Outlet center pitch 60.96 mm

Duct length 62 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 depth62Fitting collars12Collar interior*38.5 × 98.5Outlet center pitch60.96Print depth · incl. collars74Passage blend radius6–8Main shell · nominal1.2Fan front → card face87Splitter nose front edge0.4Splitter profileRounded / cubicCard length · nominal267Power openingOpen outer/top; latch relief retainedCollar wall1.2

V28 closes the card face that V27 left exposed at the GPU seat beside each power-plug pocket, between the plug housing clearance and the rounded bay wall. The fin channels run across the card, so an open channel end there let the pressurized air escape. The seat now covers everything over the fin stack except the plug and latch clearances, grown from the bay-wall shell at 40 degrees so it still prints without support. The fan-to-GPU distance is also cut from 70 to 62 mm (total depth 74 mm); CFD shows no airflow cost from the shorter chamber. P1S/PETG: 144 min / 67.6 g.

Download V28 STL ↓
10 mm collar fit gauges ↓
Print & connector fitting notes →
Geometry and print checks (JSON) →
All releases · both slot layouts →
ARCTIC fan drawings & pressure curve ↗