NF DTU 24.1:2020

Building works - Chimney specialist works - Installation of systems for evacuation of combustion products equiping one more appliances - General rules - Part 1-1-1 : contract bill of technical model clauses - Part 1-1-2 : contract bill of technical model clauses - Part 1-2 : general criteria for selection of materials - Part 2 : contract bill of special administrative model clauses