Basement Radon Soil-Gas Mitigation & Sub-Slab Suction Fan Sizer

Deterministic Sub-slab Darcy radial pressure-field propagation (gravel vs compacted sand/clay permeability) vs stack-effect soil-gas entry engine (.csv, .pdf, .json) built for Airthings, RadonAway, Fantech, EcoQube — zero-upload ephemeral Wasm RAM execution.

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