Blower-Door Airtightness (n50) Equivalent Hole-Size & Heat-Loss Translator

Deterministic Power-law building envelope orifice flow Q = C * ΔP^n -> Effective Leakage Area (ELA at 4 Pa) + Sherman-Grimsrud natural infiltration engine (.pdf, .json, .csv) built for Retrotec, Minneapolis BlowerDoor, Pro Clima, Siga — zero-upload ephemeral Wasm RAM execution.

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