According to the ordinance of the Minister of Labour and Social Policy dated 26 September 1997 on general principles of safety and hygiene at work and the ordinance of the Minister of Labour and Social Care dated 1 December 1998 on safety and hygiene of work at stations equipped with screen monitors, the work in office rooms should be performed at appropriate temperatures, air humidity and ventilation ensured by the employer.

• Temperature in an office room cannot be lower than 18⁰C .
• Air relative humidity should be higher than 40%.
• Rooms and work-places should be protected against uncontrolled heat emission and inflow of cold air from outside. 
• Air should be exchanged in the rooms as it results from the needs and functions of the rooms, heat balance and humidity. 
• In the rooms where there is no air conditioning air should be exchanged no fewer than 0.5 time within an hour (exchange by means of mechanical ventilation is not a continuous exchange)
• Ventilation should not cause any draughts, chill or overheating in the rooms.
• Air current from the pressure ventilation should be directed towards the work-place.
• When ventilation equipment is used, devices reducing its noise and vibration should be used.
• When pressure ventilation is used with air recirculation the amount of fresh air should not be lower than 10% of the total air exchanged.
  

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