ISO 9972-2015 pdf free.Thermal performance of buildings – Determination of air permeability of buildings 一 Fan pressurization method. ISO 9972 is intended for the measurement of the air permeability of buildings or parts of buildings in the field. It specifies the use of mechanical pressurization or depressurization of a building or part of a building. It describes the measurement of the resulting air flow rates over a range of indoor-outdoor static pressure differences. This International Standard is intended for the measurement of the air leakage of building envelopes of single-zone buildings. For the purpose of this International Standard, many multi-zone buildings can be treated as single-zone buildings by opening interior doors or by inducing equal pressures in adjacent zones. International Standard does not address evaluation of air permeability of individual components. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7345, Thermal insulation — Physical quantities and definitions 3 Terms, definitions, and symbols 3.1 Terms and definitions For the purposes of this documcnt,…