Copy results, share a link that reproduces your inputs, export a PDF calculation record, and save projects.
The calculator offers four ways to get a result out: the clipboard, a share link, a PDF calculation record, and a saved project.
Copy results puts a plain-text summary on your clipboard — shape, flow (as entered and in m³/s), length, velocity, Reynolds number and regime, friction factor, Σ K, the straight and fitting drops, the total, and the disclaimer. It is meant for pasting into an email or a transmittal note, not for archiving: it records the answer, not enough of the inputs to rebuild it.
The rail's Share button (and the File menu's Copy share link row) copies a URL of the
current tool page with your inputs packed into a single #i= fragment — one opaque, base64-
encoded blob, not separate named parameters. Opening it loads the calculator with those inputs
already filled in — useful for sending a colleague the exact case you are looking at without
saving anything to an account. Nothing is calculated until the recipient presses Calculate
themselves. The button confirms with Link copied once the URL is really on your clipboard,
or Copy failed if the browser refused the write.
The blob carries every scalar input (airflow value and unit, duct length, shape, width/height or
diameter, roughness preset and value, air temperature and pressure, Σ K mode, manual Σ K), the
duct role by key (main, branch or none), and the fitting schedule as one entry per row
(fitting key, quantity, override). There is no per-field query-string mapping to read off the
URL — the fragment is opaque by design.
Three things to know:
Print and Export PDF are offered on three surfaces, each with its own label: the action rail (Print / Export PDF), the File menu's Report group (Print report / Export PDF), and the Report evidence block itself (Print / Save as PDF / Export branded PDF). All three are disabled until Calculate has produced a current result — there is no way to print or export an incomplete or stale calculation, so what you export always matches what is on screen.
Export PDF renders a Duct Pressure Drop — Calculation Record containing:
The PDF is rendered on the server from your raw inputs — the calculation is redone there rather than trusting the numbers your browser displays, so the report can never disagree with the tool.
PDF export requires a plan that grants the export.pdf entitlement. Without it the button
carries a PRO badge and routes you to the upgrade page rather than exporting; the
restriction is enforced on the server as well as in the interface. See
Plans and payments.
Saving requires an account — signed out, the File menu offers Sign in to save & manage projects instead of the save actions. See Projects for how saved projects are organised across tools.
| File menu | Effect |
|---|---|
| New | Detaches the current project and clears the inputs to defaults. |
| Load project | Opens a saved MEC-01 project. |
| Save | Saves to the current project. Keyboard: Ctrl + S (Cmd + S on macOS). |
| Autosave | Toggles automatic saving; the menu shows On or Off. |
| Save As | Saves as a new project. |
| Rename | Renames the current project. |
A saved project stores your inputs only — the calculation is redone from them on load, so opening an old project always reflects the current library and equations rather than a frozen answer. The breadcrumb shows the tool code, version and project name, and the save indicator reports saved / unsaved / saving.
This tool has no undo history and no in-tool reset action. File → New is the only way to clear every input back to its default, it detaches the current project immediately, and the only recovery is your last save.