August 28, 2026 — Air Flow cascade, Imperial/Metric grid, top-bar nav
Path: ?v=40. Fan Laws merge is still later.
Engine
- The last committed box is held. Every other box a formula can compute is rewritten (not empty-only fill).
- CFM updates BTU, FPM, and VP. SP/TP stay as typed. SP updates VP → FPM → CFM → BTU (TP held).
- SA | RA sets the sign on filled SP/TP (SA positive, RA negative). Empty boxes stay empty.
Grid
- Imperial left, Metric right: BTU/kW, CFM/L/s, sq.in./cm², °F/°C, in. w.c./Pa, FPM/m/s.
- Dew (°F/°C) and SA/RA RH in a four-column row at the bottom. Empty outputs have no em dash.
- No Imperial/Metric headers. No under-grid summary lines.
Chrome
- Step dropdown removed. Prev / Next sit in the top bar between Menu and Settings.
- Fan Laws “what to calculate” select is unchanged on step 2.
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