Lietuvos higienos norma HN 69:2003 (approved by Sveikatos apsaugos ministro isakymas Nr. V-770, 2003-12-24; in force since 2004-03-27; confirmed status 'Galioja') sets indoor workroom air-temperature ceilings by work-difficulty category. Per VDI's 2026-06-29 public statement (citing the HN 69:2003 framework): warm-season indoor ceiling is 28°C for light/office work and 26°C for physically demanding work. VDI separately states that outdoor workers must receive special breaks no less frequently than every 1.5 hours, totaling at least 40 minutes per 8-hour shift, once outdoor ambient temperature exceeds 28°C. The precise legal instrument underlying that specific outdoor figure was not independently confirmed in the research dossier (VDI's own press page returned HTTP 403 in research; figures corroborated by three independent secondary outlets) -- it is modeled here as an enforcement-guidance duty overlay, distinct from and less certain than the HN 69:2003 indoor ceiling. Neither figure is a graduated work/rest-minutes schedule; exceeding either is a compliance/inspection duty. A graduated reduced-working-hours table (29-32.5°C -> 6hrs-1hr) reported by a single untraceable secondary synthesis is UNVERIFIED and is deliberately NOT encoded.
No standalone formula is published for this standard; see programmable logic and parameters below.
Governing metric: Indoor (workroom) dry-bulb air temperature (°C) by work category; outdoor ambient air temperature (°C) for the break-frequency duty.
| Parameter | Value |
|---|---|
indoorLightMaxC | 28 |
indoorPhysicalMaxC | 26 |
outdoorBreakTriggerC | 28 |
outdoorBreakMaxIntervalHours | 1.5 |
outdoorBreakMinPerShiftMinutes | 40 |
The graduated reduced-working-hours table (29 deg C -> 6 hrs ... 32.5 deg C -> 1 hr) attributed to 'light office/administrative work' by a single untraceable secondary search-engine synthesis is UNVERIFIED (no primary or clearly identified secondary source) and directly conflicts with the verified VDI 28/26 deg C ceiling framing -- it is deliberately NOT encoded. The VDI outdoor break-frequency figure's precise underlying legal instrument (HN 69:2003 itself vs. a separate ministerial order vs. internal VDI enforcement practice) was not confirmed in the research dossier; treat as enforcement guidance pending confirmation of the governing instrument.
Programmable logic: Indoor branch (indoorTempC + workload supplied): map workload to HN 69:2003 category -- light/office => 28°C ceiling, physically demanding (moderate/heavy/very heavy) => 26°C ceiling. Exceeding the ceiling flags a compliance/inspection trigger; no work/rest schedule. Outdoor branch (outdoor === true + airTempC supplied): if airTempC > 28°C, surface the VDI break-frequency duty (breaks at least every 1.5 hours, minimum 40 minutes aggregate per 8-hour shift, drinking water, appropriate clothing). Branches evaluate independently -- either, both, or neither may fire depending on which inputs are supplied.
Required inputs: none
Optional inputs: indoorTempC, workload, airTempC, outdoor