Dual 170HX · 120 mm duct

ARCTIC P12 Pro PST CO · A30 · 38.5 × 98.5 mm fit · push-pull · intake + exhaust fan @ 2500 rpm

A30 · push-pull · plug collector (DRAFT)

DuctGPUsPower cablesExhaust collectorCase rearSlot screwsKeep-outs

plug collector for the Fractal recessed bay: DRAFT, photo estimates, not released. 4-slot: the model centres the six slot positions in the seven-slot bay, so the real cards sit half a slot (10.2 mm) to one side of the mouths drawn here (and in the CFD run)

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Actual A30 duct STL + plug collector (DRAFT) (from its parameters) · photo-informed hardware approximation
Ogive fairing behind the motor hub · 65% less dead core · 2-slot pitch

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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

A30 is A29 (adjacent cards, 40.64 mm pitch) with the V30 hub fairing: a hollow 1.2 mm shell of revolution on the fan axis, 50.5 mm across at the fan, tapering to a point 35 mm downstream inside the shared wall. It fills the slowly recirculating core behind the fan motor. Its inside is open toward the fan and closes as a 44 degree cone, so it prints fan-face down without support. CFD, single fan, same mesh: reverse-flow volume in the hub core 23.8 to 8.2 cm3 (-65%), duct loss 0.198 to 0.188 Pa; flow (9.13 L/s) and peak GPU rise (87.5 K) are unchanged. On a second mesh and with a rounded fan inlet in the model the core reduction holds (57-63%) and the loss drops 2-3%: a cleaner flow, not a cooling gain. The rim lands on the flat rear face of the fan motor housing: about 52 mm across on a P12 Pro PST CO (measured from a photo against the 105 mm hole spacing, ±1 mm), so the 50.5 mm rim sits about 0.75 mm inside its edge. Everything else is A29. P1S/PETG: 146 min / 67.8 g.

Download A30 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 ↗