Check list of ventilation requirements

Compulsory ventilation check of all larger systems
From 2008, all larger ventilation and air conditioning systems require a compulsory check-up, which needs to be carried out at least once every 5 years. This compulsory ventilation check can be included in the Trust’s ventilation package instead of the certified ventilation check-up. Read more about the ventilation check-up here.

If you want to find out more about the compulsory ventilation check you can find it at http://www.ens.dk/sw52288.asp (currently only in Danish).

Energy consumption requirements for new ventilation systems
The Danish Building Regulations (BR08) state that ventilation systems should be installed on the basis that they avoid wasting energy. The following conditions apply:

• Power rating for ventilation should not exceed the following SFP values (Specific fan power):
• - System with constant airflow volume (CAV): 2,100 W/m3/s (watts per m3 of air per second)
• - System with variable airflow volume (VAV): 2,500 W/m3/s at maximum air volume.
• Airflow volume must suit the requirements of the building in relation to operating time and load.
• There must be metering instruments or a metering terminal so that control of operations and energy consumption is possible.
• There should be efficient heat recovery from extracted air. The minimum temperature efficiency of a heat exchanger should be at least 65%.

If your ventilation system predates 1995, you have a particularly good chance of achieving savings in electricity and heat because prior to that there were no requirements in the Danish Building Regulations for the energy efficiency of ventilation systems.

Ventilation requirements in schools
BR08 requirements: Minimum fresh air volume is 5 l/s (litres per second) per person plus 0.4 litres per second per m2 of flooring. The Trust recommends that the air volume does not exceed the BR08 requirements plus 25%.

Example: A ventilated area of 1,500 m2 in a school of 200 students and teachers should be ventilated with a minimum of 1,600 litres per second, equal to 5,760 m3 per hour.

Ventilation requirements in daycare facilities
• BR08 requirements: Minimum air volume for ventilation is 3 l/s per child plus 5 litres l/s per adult plus 0.4 l/s per m2 of flooring. The Trust recommends that airflow volumes do not exceed the BR08 requirements plus 25%.

Example: A ventilated area of 200 m2 in a daycare facility for 40 children and 8 adults should be ventilated with a minimum of 240 l/s equal to 864 m3 per hour.

Ventilation requirements in offices
The Danish Building Regulations do not contain specific requirements for ventilation in offices. The Trust recommends that the minimum air volume is 7 l/s per person, and that the airflow volume does not exceed the projected airflow volume for the building.

If the projected air volume is unknown, or if the requirement has altered from that originally planned, then a further evaluation of the requirement should be undertaken.

Example: An office building with 200 staff employed should be ventilated with a minimum of 1,400 l/s equal to 5,040 m3 per hour.