Dual 170HX · 120 mm duct

ARCTIC P12 Pro PST CO · A29 · 38.5 × 98.5 mm fit · push-pull · intake + exhaust fan @ 2500 rpm

A29 · push-pull · collector v4 (4-slot)

DuctGPUsPower cablesExhaust collectorCase rearSlot screwsKeep-outs

Flat CEM rear panel, not your Fractal case · collector v4 (4-slot) (released)

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Actual A29 duct STL + collector v4 (4-slot) STL · photo-informed hardware approximation
Cards in four consecutive slots · 40.64 mm pitch · one shared 2.14 mm wall between the cards

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Inspect the model

Explode assembly 0 mm

Outlet center pitch 40.64 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 = −20.3 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 pitch40.64Print 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

A29 is V29 for two cards in adjacent slots (four consecutive slots, 2-slot pitch: 40.64 mm between card centres) instead of one empty slot between them (V29, 3-slot pitch: 60.96 mm). The bores are only 2.14 mm apart, so the two inner collar walls become one shared 2.14 mm wall that slides between the cards and is also the splitter web from the fan face to the collar top. Bores, outer collars, seat seal, plug pockets, 1.2 mm walls and the 62 mm chamber are V29's, including its lever-shaped latch notch; the plug and latch sweeps have zero collision, including the inner plug next to the shared wall. P1S/PETG: 135 min / 64.7 g.

Download A29 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 ↗