System Adjustments

For certain HVAC types, information regarding system adjustments can help improve the EPC rating. The following is an example of data that would be likely to improve the EPC rating however this data is not always available.

Ductwork Leakage Tested

If the ductwork has been leakage tested within the past 12 months then the CEN classification for air leakage can be entered. Ressult options are Class B, Class A or Worse than Class A.

Airtight ductwork is one of the keys to improving the efficiency of an HVAC system. Leaky ducts can significantly increase energy bills, dramatically reduce system capacity and performance in addition to causing indoor air quality problems. Duct leakage is often responsible for complaints about indoor comfort by building occupants

Different classes refer to the maximum air leakage obtained for the different test conditions according to the CEN standard EN 13779. HVCA DW144 recommendations are equivalent to :

Medium pressure 9500 t0 1000Pa Class B

Low pressure (up to 500Pa) Class A

Worse than Class A

The pressure values indicate inside to outside test pressures.

Air Handling Unit Leakage - Does the AHU meet CEN leakage Standards?

If the AHU has been leakage tested within the past 12 months then the rating can be entered. Result options are Class L1, L2, L3 or worse. The leakage classes correspond to the previous EN 1886 AHU classes A (L3), B(L2), C(L1), tested at 400 Pa negative. The CEN classes L1, L2, L3 for the air handling units correspond to Eurovent classes C, B and A.

Specific Fan Power

More information on the SFP is available here.

Heat Recovery

If heat recovery is installed such as a Plate Heat Exchanger, Run Around Coil, Heat Pipes or Thermal Wheel then this will improve the energy efficiency of the building. If available the seasonal efficiency of the heat recovery can be entered.