Theoretical stack-effect draft

Code snippets

curl "https://api.oanor.com/chimney-api/v1/draft" \
  -H "x-oanor-key: oanor_test_..."

await fetch("https://api.oanor.com/chimney-api/v1/draft", {
  headers: { "x-oanor-key": "oanor_test_..." }
});

$ch = curl_init("https://api.oanor.com/chimney-api/v1/draft");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);

import requests
requests.get(
    "https://api.oanor.com/chimney-api/v1/draft",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "note": "Theoretical draft ≈ 3465 × height × (1/T_outside − 1/T_flue), with temperatures in kelvin — taller chimneys and hotter flue gas pull harder, and a cold outside boosts it. Real draft is lower after friction and bends. Most appliances want roughly 10–30 Pa (0.04–0.12 in w.c.); too much draft wastes heat up the flue.",
        "inputs": {
            "height_m": 6,
            "flue_temp_c": 200,
            "outside_temp_c": 0
        },
        "draft_pa": 32.2,
        "draft_in_wc": 0.1292
    },
    "meta": {
        "timestamp": "2026-06-06T15:30:41.880Z",
        "request_id": "21f1b41c-e3b4-4c79-9b3e-74dd185615e4"
    },
    "status": "ok",
    "message": "Draft",
    "success": true
}