Including the closely related term improved air.
… Energy Modelling | High-rise Block – DPD requirement for space heating demand PHPP modelling to achieve 30kWh/m2/yr PHPP modelling indicates that even with the Part L 2013 fabric requirement, due to the building’s low form factor, it is relatively easy to achieve a heating demand close to 30 KWh/m2/yr. The proposed Policy Option A requirement (introduction of MVHR and improved air tightness) can…