What sort of certification programmes for ductwork airtightness exist?

Eurovent Certita Certification have a certification programme for rigid and semi-rigid ventilation ductwork systems divided into the following sub-programmes: Rigid metallic ductwork systems with circular cross-section (DUCT-MC); Rigid metallic ductwork systems with rectangular cross-section (DUCT-MR); Semi-rigid non-metallic ductwork systems predominantly Continue reading →