Intry Verified receipt
Is the Intry Combustion Air Calculator accurate?
The provenance receipt for the Intry Combustion Air Calculator: the exact authority its numbers derive from, the edition they are keyed to, who has final say, and how a deploy gate re-checks its numbers against their cited source.
Short answer: Every figure an Intry calculator computes comes from a locked source module, not hand-typed. 9547 automated checks re-derive and source-check the numbers against the IFGC 2021 Section 304 / NFPA 54 §9.3 combustion-air provisions it was computed from before each deploy. This is our own deterministic gate, not a third-party audit. The per-tool receipt is public at https://www.intrysys.com/verified.
The receipt
- Calculated from
- the IFGC 2021 Section 304 / NFPA 54 §9.3 combustion-air provisions it was computed from. Reused verbatim from the locked engine, never re-written for this page.
- Checked
- Before any deploy, a deterministic test suite re-derives calculated figures from their locked source module and source-checks the numbers against what they cite, so a number is held to its real source, not just to itself. As of the current build that suite holds 9547 checks, and it gates this page too. This is our own deterministic gate, not a third-party audit.
- Runnable
- A reference engine that powers the published numbers. It is not exposed as a runnable MCP tool.
- Final say
- The authority having jurisdiction and the appliance manufacturer's instructions have final say. This never certifies a space safe: a real combustion-air problem is confirmed by a draft, spillage, or CO test.
Frequently Asked Questions
Is the Intry Combustion Air Calculator accurate?
Every figure an Intry calculator computes comes from a locked source module, not hand-typed. 9547 automated checks re-derive and source-check the numbers against the IFGC 2021 Section 304 / NFPA 54 §9.3 combustion-air provisions it was computed from before each deploy. This is our own deterministic gate, not a third-party audit. The per-tool receipt is public at https://www.intrysys.com/verified.