HN 69:2003 (in force since 2004-03-27) sets indoor workroom air-temperature ceilings by work-difficulty category. Per VDI's 2026-06-29 statement: warm-season ceiling is 28°C for light/office work and 26°C for physically demanding work. VDI separately states outdoor workers must get special breaks at least every 1.5 hours, minimum 40 minutes per 8-hour shift, once outdoor temperature exceeds 28°C -- modeled as a distinct, less-certain enforcement-guidance overlay (legal instrument unconfirmed). No graduated work/rest schedule exists or is encoded.
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This rule has no numeric trigger the calculator evaluates — it states duties and control measures rather than a threshold a reading can be checked against. Its measures are listed below.
No standalone formula is published for this standard; see programmable logic and parameters below.
| 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: map workload to category (light/office => 28°C ceiling, physically demanding => 26°C ceiling); exceeding it flags a compliance/inspection trigger. Outdoor: if outdoor===true and airTempC > 28°C, surface the VDI break-frequency duty. Branches evaluate independently.
Required inputs: none
Optional inputs: indoorTempC, workload, airTempC, outdoor
This standard was added to the calculator.
Get notified when Lithuania HN 69:2003 Indoor Temperature Ceilings + VDI Outdoor Heat-Break Guidance changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
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If a threshold, trigger, exemption, date or duty here disagrees with the governing text, tell us and point at the section. The form arrives with this standard already named, and a correction is checked against the same primary document it was encoded from.