Whisper-Quiet HRV/ERV Radial Duct Velocity & Winter Moisture-Frost Sizer

Deterministic Continuity & Colebrook corrugated-duct ΔP + regenerated aerodynamic grille noise power (Lw ~ v^5.5) + psychrometric core frost point engine (.pdf, .csv, .dxf, .json) built for Zehnder ComfoAir, Vallox, Systemair, Helios — zero-upload ephemeral Wasm RAM execution.

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