The standard

Intry Verified

Every result Intry publishes carries the same four facts, in the same order, on every calculator and both trades: what it was calculated from, what it was run with, how it was checked, and who has final say. This is the standard, so you can follow any number backwards without taking our word for it.

The four facts on every result

Calculated from

The exact authority the number came from: the cited NEC 2023 section for electrical tools, the manufacturer pressure-temperature data for refrigerant tools, the ACCA Manual J basis for load sizing, or the bender geometry for a bend. It is reused verbatim from the engine, never re-written for the page.

Run with

The exact inputs the engine consumed for that run: the materials, the terminal ratings, the conditions. A number is only correct given its inputs, so we show them. Nothing the engine did not use appears here.

Checked

How the number is held to its source. Every figure Intry publishes is re-derived from a locked data module by an automated test suite that must pass before any deploy. It is our own deterministic gate, not a third-party audit, and we say so.

Final say

Who has the last word, in plain terms. Your AHJ and local amendments on an electrical install, the unit nameplate and the manufacturer's charging chart on a refrigerant system, a full Manual J on the actual house. The standard's last line is deliberately not ours.

How a number earns it

Two rules make the standard checkable instead of aspirational. First, derive, never hand-type: every published number traces to a locked data module (an NEC table, a manufacturer PT chart), so it cannot be transcribed wrong. Second, declare, never restate: which authority governs a tool is declared once, in one place, so an HVAC result is structurally incapable of claiming the electrical code, and the reverse.

Those rules are enforced by a test suite that re-derives every figure from its source and runs before every deploy. If a number drifts from what it cites, the build stops and the change never ships. As of the current build that suite holds 977 checks, and it is the gate this very page passed through.

Where you see it

On every Intry calculator, under the result, there is a line that reads where this number comes from. Open it and you get the trace: the four facts for the exact reading on your screen, stamped with the build that checked it. Same block, same order, every tool. When an assistant runs an Intry calculator, it gets the same provenance in its result.