Purchasing guidelines for ventilators

Purchasing guidelines for ventilators
The requirements conform to the ‘Spareventilator®’ specifications of the Danish electricity supply companies.

The specifications apply to ventilators for ventilation systems installed in premises, open spaces, etc. The requirements conform to the ‘Spareventilator®’ specifications as defined by the Danish electricity supply companies. Energy efficient ventilators must, as a minimum, conform to the specifications in the table.

Good advice on purchasing and operating equipment

• Get a certified ventilation check-up as one element of the Trust’s ventilation package. A free meter system with remote reading capacity is supplied with the package, which makes it possible to view power consumption on the Internet and compare it with other systems.
  
• From 2008, all large air conditioning and ventilation systems in Denmark will be subject to a compulsory ventilation inspection, which must be carried out every five years. This inspection can be included in the Trust’s ventilation pack instead of the certified ventilation check-up.
  
• Ensure that the ventilation system only operates when required. Install a timer control if none is fitted, and check that the installation is well suited to purpose.
  
• Ensure that the system’s air flow is correctly adjusted so that the ventilation satisfies the required demand.
  
• Remember to conform to the Danish building regulations covering new ventilation systems. These include requirements specifying that ventilation systems must have a heat recirculation coefficient of at least 65%, and requirements covering the maximum consumption of electricity by ventilation fans operating in constant flow ventilation systems.
  
• Comply with the Danish building regulations applying to SEL (specific electricity consumption) factor for ventilation systems.

Further information

• Read more about energy-saving ventilators (only in Danish) 
  
• See the Trust’s 2008 Layout Guidelines on energy efficient ventilation (only in Danish)
  
• Read about the compulsory ventilation check (only in Danish)
  
• See the Danish Building regulations (only in Danish)

Changes in relation to the 2007 requirements
There are no changes in relation to the 2007 requirements

Notes and additional definitions
(1) Interval stated includes upper threshold figure; e.g. 1 kW output is classified in the 0.5-1 kW interval.

(2) The efficiency is the minimum value that a ventilator must achieve at the duty point, which is the point on the efficiency curve relative to the shaft power when the requirement is fulfilled. This is usually around the maximum possible revolutions per minute (RPM), but it can also be at some other point on the curve.

(3) The ventilator must have a capacity range on the curve for maximum efficiency that, as a minimum, extends from the duty point down to a value equivalent to the duty point minus 50%.