Harmonised European Standard as referenced in the Official Journal of the European Union1 (or any adopted national version of such Harmonised European Standard)(1)
Specification for masonry units - Part 3: Aggregate concrete masonry units (Dense and lightweight aggregates)
Specification for masonry units - Part 4: Autoclaved aerated concrete masonry units
1OJ No. L88, 4.4.2011, p.5
Inserted by FA22 s99(1)(n). Comes into operation on 1 September 2023.