ISO/NP 16956 http://www.iso.org ISO standards and projects ISO - International Organization for Standardization 240 http://www.iso.org/iso/logo_iso.gif http://www.iso.org ISO/NP 16956 ISO/NP 16956 - Thermal Performance in the Built Environment -- Determination of Air Flow Rate in Building Applications by Field Measuring Methods This document reached stage 10.99 on 2011-10-18 , TC/SC: ISO/TC 163/SC 1, ICS: 91.120.10 Standards under development