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ATTMA Technical Standard L3 (TSL3) - Measuring Air Permeability in the Envelopes of Complex Buildings Fan Pressurisation Method - Issue 1.0
This document provides the technical standard to be followed for the testing of buildings that are considered complex. A complex building is defined as one which cannot be tested in the entirety with a single test.
This testing described in this standard is fundamentally based on ISO 9972:2015 Thermal performance of buildings – ‘Determination of air permeability of buildings - Fan pressurization method’ though the guidance is provided by the Air Tightness Testing & Measurement Association.
This Technical Standard provides detailed guidance and clarification of the above standard to ensure consistency by testing companies.
Guidance for test procedures for the testing of buildings that are simple is provided within companion reference document ATTMA Technical Standard L1.
Guidance for test procedures for the testing of buildings that are non-simple is provided within companion reference document ATTMA Technical Standard L2.
Guidance for test procedures for the testing of low energy buildings is provided within companion reference document ATTMA Technical Standard L4
