TB61 Identification of ductwork

With the increasing complexity of ventilation and air conditioning systems, it is important to ensure the ready identification of ducts for the purposes of commissioning, operation and maintenance of these systems. The purpose of the following recommendations is to lead towards the use and standardisation of a system of identification for ducts, that will benefit designers, contractors and 
clients.
This updated BESA guidance revises the previously used categories and identifying colours, with enhanced definition of conditioned and extract air streams. Use of grey as a colour identifier has been removed to allow for an alternative symbol that provides greater contrast against neighbouring insulation and ductwork materials.