Desktop Laser-Cutter Negative-Pressure Duct Loss & Zero-Leak Window Exhaust Sizer

Deterministic Darcy-Weisbach helical-wire corrugated duct friction (3.2x smooth pipe) + minor elbow K-factors + static pressure gradient sign check (P_duct < P_atm) engine (.pdf, .svg, .json) built for xTool, Glowforge, Trotec, AC Infinity — zero-upload ephemeral Wasm RAM execution.

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