In June 2006, SAP Appendix Q was introduced to promote energy efficient ventilation products that offer benefit in SAP and DER (Dwelling Emission Rate) calculations.  Individual manufacturers products replace the default settings for each methodology in a newly designed database. Each product is tested to provide a specific fan power performance that can be used to calculate 'energy saving' which is re-entered into the SAP calculation process.

The Appendix Q process highlights the markets most efficient domestic ventilation products, offering an opportunity for new innovations and technologies to be recognised for improved performance and transferred into a value and benefit when specified and installed in the built environment.

Greenwood Airvac now have 6 products included on the SAP Appendix Q Website including;

Unity CV2GIP	NEW Best performing dMEV fan suitable for apartments and houses. More information coming soon
Fusion – HRV2:	EC Whole House Heat Recovery Unit suitable for apartments and houses - including antibacterial properties
Centair – CMEV.4:	AC Continuous Mechanical Extract Unit suitable for apartments and small houses
Centair – CMEV.4e:	EC Continuous Mechanical Extract Unit suitable for apartments and small houses
Fusion - HRV95:	EC Whole House Heat Recovery Unit, suitable for large houses
Fusion – HRV1:	EC Whole House Heat Recovery Unit, suitable for apartments - smallest unit available on the market
Unity - CV100	EC Constant volume continuously running single point extract fan, suitable for apartments and houses. Only de-centralised MEV on SAP Appendix Q